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Posted to dev@ariatosca.apache.org by em...@apache.org on 2017/05/22 23:39:02 UTC

[1/4] incubator-ariatosca git commit: ARIA-208 Fix models relationships [Forced Update!]

Repository: incubator-ariatosca
Updated Branches:
  refs/heads/ARIA-149-functions-in-operation-configuration b1c97e244 -> 84d8da592 (forced update)


ARIA-208 Fix models relationships


Project: http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/commit/5798bbfc
Tree: http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/tree/5798bbfc
Diff: http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/diff/5798bbfc

Branch: refs/heads/ARIA-149-functions-in-operation-configuration
Commit: 5798bbfc7d1a95965a4c44d2ebad5dad245c824a
Parents: 78d6019
Author: Ran Ziv <ra...@gigaspaces.com>
Authored: Sun May 7 14:58:46 2017 +0300
Committer: Ran Ziv <ra...@gigaspaces.com>
Committed: Mon May 22 15:17:21 2017 +0300

----------------------------------------------------------------------
 aria/modeling/service_template.py | 49 ++++++++++++++++------------------
 1 file changed, 23 insertions(+), 26 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/5798bbfc/aria/modeling/service_template.py
----------------------------------------------------------------------
diff --git a/aria/modeling/service_template.py b/aria/modeling/service_template.py
index 1eb95a3..12195a1 100644
--- a/aria/modeling/service_template.py
+++ b/aria/modeling/service_template.py
@@ -211,10 +211,6 @@ class ServiceTemplateBase(TemplateModelMixin):
         return relationship.one_to_many(cls, 'service', dict_key='name')
 
     @declared_attr
-    def operation_templates(cls):
-        return relationship.one_to_many(cls, 'operation_template')
-
-    @declared_attr
     def node_templates(cls):
         return relationship.one_to_many(cls, 'node_template', dict_key='name')
 
@@ -483,6 +479,22 @@ class NodeTemplateBase(TemplateModelMixin):
     def nodes(cls):
         return relationship.one_to_many(cls, 'node')
 
+    @declared_attr
+    def interface_templates(cls):
+        return relationship.one_to_many(cls, 'interface_template', dict_key='name')
+
+    @declared_attr
+    def artifact_templates(cls):
+        return relationship.one_to_many(cls, 'artifact_template', dict_key='name')
+
+    @declared_attr
+    def capability_templates(cls):
+        return relationship.one_to_many(cls, 'capability_template', dict_key='name')
+
+    @declared_attr
+    def requirement_templates(cls):
+        return relationship.one_to_many(cls, 'requirement_template', child_fk='node_template_fk')
+
     # endregion
 
     # region many_to_one relationships
@@ -507,22 +519,6 @@ class NodeTemplateBase(TemplateModelMixin):
     def attributes(cls):
         return relationship.many_to_many(cls, 'parameter', prefix='attributes', dict_key='name')
 
-    @declared_attr
-    def interface_templates(cls):
-        return relationship.one_to_many(cls, 'interface_template', dict_key='name')
-
-    @declared_attr
-    def artifact_templates(cls):
-        return relationship.one_to_many(cls, 'artifact_template', dict_key='name')
-
-    @declared_attr
-    def capability_templates(cls):
-        return relationship.one_to_many(cls, 'capability_template', dict_key='name')
-
-    @declared_attr
-    def requirement_templates(cls):
-        return relationship.one_to_many(cls, 'requirement_template', child_fk='node_template_fk')
-
     # endregion
 
     description = Column(Text)
@@ -1209,11 +1205,6 @@ class RequirementTemplateBase(TemplateModelMixin):
     def relationships(cls):
         return relationship.one_to_many(cls, 'relationship')
 
-    @declared_attr
-    def target_node_type(cls):
-        return relationship.many_to_one(
-            cls, 'type', fk='target_node_type_fk', back_populates=relationship.NO_BACK_POP)
-
     # endregion
 
     # region many_to_one relationships
@@ -1222,6 +1213,11 @@ class RequirementTemplateBase(TemplateModelMixin):
     def node_template(cls):
         return relationship.many_to_one(cls, 'node_template', fk='node_template_fk')
 
+    @declared_attr
+    def target_node_type(cls):
+        return relationship.many_to_one(
+            cls, 'type', fk='target_node_type_fk', back_populates=relationship.NO_BACK_POP)
+
     # endregion
 
     # region many_to_many relationships
@@ -1845,7 +1841,8 @@ class OperationTemplateBase(TemplateModelMixin):
 
     @declared_attr
     def service_template(cls):
-        return relationship.many_to_one(cls, 'service_template')
+        return relationship.many_to_one(cls, 'service_template',
+                                        back_populates='workflow_templates')
 
     @declared_attr
     def interface_template(cls):


[2/4] incubator-ariatosca git commit: ARIA-162 Upgrade Colorama library version

Posted by em...@apache.org.
ARIA-162 Upgrade Colorama library version

Upgraded the Colorama library version - This should
take care of the closed-stream error that appeared
sporadically after test runs.


Project: http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/commit/3d22d36f
Tree: http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/tree/3d22d36f
Diff: http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/diff/3d22d36f

Branch: refs/heads/ARIA-149-functions-in-operation-configuration
Commit: 3d22d36fc5c9fb780facfb8880143dda46d16f6f
Parents: 5798bbf
Author: Ran Ziv <ra...@gigaspaces.com>
Authored: Mon May 22 16:44:00 2017 +0300
Committer: Ran Ziv <ra...@gigaspaces.com>
Committed: Mon May 22 16:44:00 2017 +0300

----------------------------------------------------------------------
 requirements.in  | 2 +-
 requirements.txt | 5 +----
 2 files changed, 2 insertions(+), 5 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/3d22d36f/requirements.in
----------------------------------------------------------------------
diff --git a/requirements.in b/requirements.in
index 3950140..1dd5b1f 100644
--- a/requirements.in
+++ b/requirements.in
@@ -29,7 +29,7 @@ wagon==0.6.0
 bottle>=0.12.0, <0.13
 Fabric>=1.13.0, <1.14
 click>=4.1, < 5.0
-colorama>=0.3.3, < 0.3.5
+colorama>=0.3.7, <= 0.3.9
 PrettyTable>=0.7,<0.8
 click_didyoumean==0.0.3
 backports.shutil_get_terminal_size==1.0.0

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/3d22d36f/requirements.txt
----------------------------------------------------------------------
diff --git a/requirements.txt b/requirements.txt
index 3accaa3..f7efce9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,7 +27,7 @@ cffi==1.10.0              # via cryptography
 click==4.1
 click_didyoumean==0.0.3
 clint==0.5.1
-colorama==0.3.4
+colorama==0.3.9
 cryptography==1.8.1       # via paramiko
 decorator==4.0.11         # via networkx
 enum34==1.1.6             # via cryptography
@@ -57,6 +57,3 @@ six==1.10.0               # via cryptography, packaging, retrying
 sqlalchemy==1.1.6
 wagon==0.6.0
 wheel==0.29.0             # via wagon
-
-# The following packages are considered to be unsafe in a requirements file:
-# setuptools                # via cryptography


[4/4] incubator-ariatosca git commit: ARIA-149 Enhance operation configuration

Posted by em...@apache.org.
ARIA-149 Enhance operation configuration

* Parse special "dependencies" configuration parameters as YAML and
treat as Parameter models, allowing them full use of intrinsic
functions, type coersions, and validations
* Rename various functions that process "properties" to more generically
process "parameters" (properties, inputs, attributes, arguments, etc.)
* The "configuration" field in OperationTemplate and Operation models
is now now a dict of Parameter models
* Added "function" and "arguments" fields to Operation model to preserve
user data (in "implementation" and "inputs") and to clearly demarcate
orchestration data from user data
* Some cleanup of parser code touched by this commit


Project: http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/commit/84d8da59
Tree: http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/tree/84d8da59
Diff: http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/diff/84d8da59

Branch: refs/heads/ARIA-149-functions-in-operation-configuration
Commit: 84d8da592b3534cecbc896e7ee60704d660f4a26
Parents: 3d22d36
Author: Tal Liron <ta...@gmail.com>
Authored: Thu Apr 20 17:54:47 2017 -0500
Committer: Tal Liron <ta...@gmail.com>
Committed: Mon May 22 18:33:11 2017 -0500

----------------------------------------------------------------------
 aria/cli/commands/services.py                   |   2 +-
 aria/core.py                                    |  18 +-
 aria/modeling/constraints.py                    |  28 +++
 aria/modeling/contraints.py                     |  28 ---
 aria/modeling/exceptions.py                     |  16 +-
 aria/modeling/service_common.py                 |   4 +
 aria/modeling/service_instance.py               |  69 +++---
 aria/modeling/service_template.py               |  54 ++---
 aria/modeling/utils.py                          | 105 ++++-----
 .../execution_plugin/instantiation.py           | 133 +++++++-----
 aria/orchestrator/workflow_runner.py            |   2 +-
 aria/orchestrator/workflows/api/task.py         |   4 +-
 aria/orchestrator/workflows/core/task.py        |   1 -
 .../profiles/aria-1.0/aria-1.0.yaml             |  16 +-
 .../simple_v1_0/assignments.py                  |   4 +-
 .../simple_v1_0/modeling/__init__.py            |  65 ++++--
 .../simple_v1_0/modeling/artifacts.py           |   2 +-
 .../simple_v1_0/modeling/capabilities.py        |  24 ++-
 .../simple_v1_0/modeling/constraints.py         |   2 +-
 .../simple_v1_0/modeling/data_types.py          |  16 ++
 .../simple_v1_0/modeling/interfaces.py          |  34 ++-
 .../simple_v1_0/modeling/parameters.py          | 211 +++++++++++++++++++
 .../simple_v1_0/modeling/policies.py            |   2 +
 .../simple_v1_0/modeling/properties.py          | 202 ------------------
 .../simple_v1_0/modeling/requirements.py        |  20 +-
 .../modeling/substitution_mappings.py           |   4 +
 .../simple_v1_0/templates.py                    |  13 +-
 .../aria_extension_tosca/simple_v1_0/types.py   |  24 +--
 tests/cli/test_services.py                      |  14 +-
 tests/mock/models.py                            |  10 +-
 tests/mock/topology.py                          |  12 +-
 tests/orchestrator/context/test_operation.py    |  53 +++--
 tests/orchestrator/context/test_serialize.py    |   2 +-
 tests/orchestrator/context/test_toolbelt.py     |  14 +-
 .../orchestrator/execution_plugin/test_local.py |  10 +-
 tests/orchestrator/execution_plugin/test_ssh.py |  12 +-
 tests/orchestrator/test_workflow_runner.py      |   8 +-
 tests/orchestrator/workflows/api/test_task.py   |  26 +--
 .../workflows/builtin/test_execute_operation.py |   2 +-
 .../orchestrator/workflows/core/test_engine.py  |   6 +-
 .../orchestrator/workflows/core/test_events.py  |   3 +-
 tests/orchestrator/workflows/core/test_task.py  |   6 +-
 .../test_task_graph_into_execution_graph.py     |   2 +-
 ...process_executor_concurrent_modifications.py |  10 +-
 .../executor/test_process_executor_extension.py |  13 +-
 .../test_process_executor_tracked_changes.py    |   8 +-
 .../node-cellar/node-cellar.yaml                |  24 ++-
 47 files changed, 739 insertions(+), 599 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/aria/cli/commands/services.py
----------------------------------------------------------------------
diff --git a/aria/cli/commands/services.py b/aria/cli/commands/services.py
index 24de7c5..476387c 100644
--- a/aria/cli/commands/services.py
+++ b/aria/cli/commands/services.py
@@ -151,7 +151,7 @@ def create(service_template_name,
     except storage_exceptions.StorageError as e:
         utils.check_overriding_storage_exceptions(e, 'service', service_name)
         raise
-    except modeling_exceptions.InputsException:
+    except modeling_exceptions.ParameterException:
         service_templates.print_service_template_inputs(model_storage, service_template_name,
                                                         logger)
         raise

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/aria/core.py
----------------------------------------------------------------------
diff --git a/aria/core.py b/aria/core.py
index cc943ef..12a2683 100644
--- a/aria/core.py
+++ b/aria/core.py
@@ -2,13 +2,13 @@
 # contributor license agreements.  See the NOTICE file distributed with
 # this work for additional information regarding copyright ownership.
 # The ASF licenses this file to You under the Apache License, Version 2.0
-# (the "License"); you may not use this file except in compliance with
+# (the 'License'); you may not use this file except in compliance with
 # the License.  You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
+# distributed under the License is distributed on an 'AS IS' BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
@@ -56,7 +56,8 @@ class Core(object):
         service_template = self.model_storage.service_template.get(service_template_id)
         if service_template.services:
             raise exceptions.DependentServicesError(
-                "Can't delete service template {0} - Service template has existing services")
+                'Can\'t delete service template `{0}` - service template has existing services'
+                .format(service_template.name))
 
         self.model_storage.service_template.delete(service_template)
         self.resource_storage.service_template.delete(entry_id=str(service_template.id))
@@ -87,7 +88,8 @@ class Core(object):
                     consumption.CoerceServiceInstanceValues
                 )).consume()
             if context.validation.dump_issues():
-                raise exceptions.InstantiationError('Failed to instantiate service template')
+                raise exceptions.InstantiationError('Failed to instantiate service template `{0}`'
+                                                    .format(service_template.name))
 
         storage_session.flush()  # flushing so service.id would auto-populate
         service.name = service_name or '{0}_{1}'.format(service_template.name, service.id)
@@ -100,15 +102,15 @@ class Core(object):
         active_executions = [e for e in service.executions if e.is_active()]
         if active_executions:
             raise exceptions.DependentActiveExecutionsError(
-                "Can't delete service {0} - there is an active execution for this service. "
-                "Active execution id: {1}".format(service.name, active_executions[0].id))
+                'Can\'t delete service `{0}` - there is an active execution for this service. '
+                'Active execution ID: {1}'.format(service.name, active_executions[0].id))
 
         if not force:
             available_nodes = [str(n.id) for n in service.nodes.values() if n.is_available()]
             if available_nodes:
                 raise exceptions.DependentAvailableNodesError(
-                    "Can't delete service {0} - there are available nodes for this service. "
-                    "Available node ids: {1}".format(service.name, ', '.join(available_nodes)))
+                    'Can\'t delete service `{0}` - there are available nodes for this service. '
+                    'Available node IDs: {1}'.format(service.name, ', '.join(available_nodes)))
 
         self.model_storage.service.delete(service)
 

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/aria/modeling/constraints.py
----------------------------------------------------------------------
diff --git a/aria/modeling/constraints.py b/aria/modeling/constraints.py
new file mode 100644
index 0000000..107b010
--- /dev/null
+++ b/aria/modeling/constraints.py
@@ -0,0 +1,28 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+class NodeTemplateConstraint(object):
+    """
+    Used to constrain requirements for node templates.
+
+    Must be serializable.
+    """
+
+    def matches(self, source_node_template, target_node_template):
+        """
+        Returns true is the target matches the constraint for the source.
+        """
+        raise NotImplementedError

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/aria/modeling/contraints.py
----------------------------------------------------------------------
diff --git a/aria/modeling/contraints.py b/aria/modeling/contraints.py
deleted file mode 100644
index 107b010..0000000
--- a/aria/modeling/contraints.py
+++ /dev/null
@@ -1,28 +0,0 @@
-# Licensed to the Apache Software Foundation (ASF) under one or more
-# contributor license agreements.  See the NOTICE file distributed with
-# this work for additional information regarding copyright ownership.
-# The ASF licenses this file to You under the Apache License, Version 2.0
-# (the "License"); you may not use this file except in compliance with
-# the License.  You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-
-class NodeTemplateConstraint(object):
-    """
-    Used to constrain requirements for node templates.
-
-    Must be serializable.
-    """
-
-    def matches(self, source_node_template, target_node_template):
-        """
-        Returns true is the target matches the constraint for the source.
-        """
-        raise NotImplementedError

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/aria/modeling/exceptions.py
----------------------------------------------------------------------
diff --git a/aria/modeling/exceptions.py b/aria/modeling/exceptions.py
index 19fd942..d0e3e22 100644
--- a/aria/modeling/exceptions.py
+++ b/aria/modeling/exceptions.py
@@ -22,9 +22,9 @@ class ModelingException(AriaException):
     """
 
 
-class InputsException(ModelingException):
+class ParameterException(ModelingException):
     """
-    ARIA inputs exception.
+    ARIA parameter exception.
     """
     pass
 
@@ -41,19 +41,19 @@ class CannotEvaluateFunctionException(ModelingException):
     """
 
 
-class MissingRequiredInputsException(InputsException):
+class MissingRequiredParametersException(ParameterException):
     """
-    ARIA modeling exception: Required inputs have been omitted.
+    ARIA modeling exception: Required parameters have been omitted.
     """
 
 
-class InputsOfWrongTypeException(InputsException):
+class ParametersOfWrongTypeException(ParameterException):
     """
-    ARIA modeling exception: Inputs of the wrong types have been provided.
+    ARIA modeling exception: Parameters of the wrong types have been provided.
     """
 
 
-class UndeclaredInputsException(InputsException):
+class UndeclaredParametersException(ParameterException):
     """
-    ARIA modeling exception: Undeclared inputs have been provided.
+    ARIA modeling exception: Undeclared parameters have been provided.
     """

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/aria/modeling/service_common.py
----------------------------------------------------------------------
diff --git a/aria/modeling/service_common.py b/aria/modeling/service_common.py
index e9c96a4..3caa147 100644
--- a/aria/modeling/service_common.py
+++ b/aria/modeling/service_common.py
@@ -211,6 +211,10 @@ class ParameterBase(TemplateModelMixin, caching.HasCachedMethods):
         """
         Wraps an arbitrary value as a parameter. The type will be guessed via introspection.
 
+        For primitive types, we will prefer their TOSCA aliases. See the `TOSCA Simple Profile v1.0
+        cos01 specification <http://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/v1.0/cos01
+        /TOSCA-Simple-Profile-YAML-v1.0-cos01.html#_Toc373867862>`__
+
         :param name: Parameter name
         :type name: basestring
         :param value: Parameter value

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/aria/modeling/service_instance.py
----------------------------------------------------------------------
diff --git a/aria/modeling/service_instance.py b/aria/modeling/service_instance.py
index 41a388d..d14cdc5 100644
--- a/aria/modeling/service_instance.py
+++ b/aria/modeling/service_instance.py
@@ -1633,20 +1633,24 @@ class OperationBase(InstanceModelMixin):
     :vartype operation_template: :class:`OperationTemplate`
     :ivar description: Human-readable description
     :vartype description: string
-    :ivar plugin: Associated plugin
-    :vartype plugin: :class:`Plugin`
     :ivar relationship_edge: When true specified that the operation is on the relationship's
                              target edge instead of its source (only used by relationship
                              operations)
     :vartype relationship_edge: bool
     :ivar implementation: Implementation (interpreted by the plugin)
     :vartype implementation: basestring
-    :ivar configuration: Configuration (interpreted by the plugin)
-    :vartype configuration: {basestring, object}
     :ivar dependencies: Dependency strings (interpreted by the plugin)
     :vartype dependencies: [basestring]
     :ivar inputs: Parameters that can be used by this operation
     :vartype inputs: {basestring: :class:`Parameter`}
+    :ivar plugin: Associated plugin
+    :vartype plugin: :class:`Plugin`
+    :ivar configuration: Configuration (interpreted by the plugin)
+    :vartype configuration: {basestring, :class:`Parameter`}
+    :ivar function: Name of the operation function
+    :vartype function: basestring
+    :ivar arguments: Arguments to send to the operation function
+    :vartype arguments: {basestring: :class:`Parameter`}
     :ivar executor: Name of executor to run the operation with
     :vartype executor: basestring
     :ivar max_attempts: Maximum number of attempts allowed in case of failure
@@ -1728,34 +1732,41 @@ class OperationBase(InstanceModelMixin):
     def inputs(cls):
         return relationship.many_to_many(cls, 'parameter', prefix='inputs', dict_key='name')
 
+    @declared_attr
+    def configuration(cls):
+        return relationship.many_to_many(cls, 'parameter', prefix='configuration', dict_key='name')
+
+    @declared_attr
+    def arguments(cls):
+        return relationship.many_to_many(cls, 'parameter', prefix='arguments', dict_key='name')
+
     # endregion
 
     description = Column(Text)
     relationship_edge = Column(Boolean)
     implementation = Column(Text)
-    configuration = Column(modeling_types.StrictDict(key_cls=basestring))
     dependencies = Column(modeling_types.StrictList(item_cls=basestring))
+    function = Column(Text)
     executor = Column(Text)
     max_attempts = Column(Integer)
     retry_interval = Column(Integer)
 
     def configure(self):
-        from . import models
-        # Note: for workflows (operations attached directly to the service) "interface" will be None
-        if (self.implementation is None) or (self.interface is None):
+        if (self.implementation is None) and (self.function is None):
             return
 
-        if self.plugin is None:
-            arguments = execution_plugin.instantiation.configure_operation(self)
+        if (self.plugin is None) and (self.interface is not None):
+            # Default to execution plugin ("interface" is None for workflow operations)
+            execution_plugin.instantiation.configure_operation(self)
         else:
             # In the future plugins may be able to add their own "configure_operation" hook that
-            # can validate the configuration and otherwise return specially derived arguments
-            arguments = self.configuration
+            # can validate the configuration and otherwise create specially derived arguments. For
+            # now, we just send all configuration parameters as arguments
+            utils.instantiate_dict(self, self.arguments, self.configuration)
 
-        # Note: the arguments will *override* operation inputs of the same name
-        if arguments:
-            for k, v in arguments.iteritems():
-                self.inputs[k] = models.Parameter.wrap(k, v)
+        # Send all inputs as extra arguments. Note that they will override existing arguments of the
+        # same names.
+        utils.instantiate_dict(self, self.arguments, self.inputs)
 
     @property
     def as_raw(self):
@@ -1764,17 +1775,18 @@ class OperationBase(InstanceModelMixin):
             ('description', self.description),
             ('implementation', self.implementation),
             ('dependencies', self.dependencies),
-            ('executor', self.executor),
-            ('max_attempts', self.max_attempts),
-            ('retry_interval', self.retry_interval),
             ('inputs', formatting.as_raw_dict(self.inputs))))
 
     def validate(self):
-        # TODO must be associated with interface or service
+        # TODO must be associated with either interface or service
         utils.validate_dict_values(self.inputs)
+        utils.validate_dict_values(self.configuration)
+        utils.validate_dict_values(self.arguments)
 
     def coerce_values(self, report_issues):
         utils.coerce_dict_values(self.inputs, report_issues)
+        utils.coerce_dict_values(self.configuration, report_issues)
+        utils.coerce_dict_values(self.arguments, report_issues)
 
     def dump(self):
         context = ConsumptionContext.get_thread_local()
@@ -1782,21 +1794,14 @@ class OperationBase(InstanceModelMixin):
         if self.description:
             console.puts(context.style.meta(self.description))
         with context.style.indent:
-            if self.plugin is not None:
-                console.puts('Plugin: {0}'.format(
-                    context.style.literal(self.plugin.name)))
             if self.implementation is not None:
                 console.puts('Implementation: {0}'.format(
                     context.style.literal(self.implementation)))
-            if self.configuration:
-                with context.style.indent:
-                    for k, v in self.configuration.iteritems():
-                        console.puts('{0}: {1}'.format(context.style.property(k),
-                                                       context.style.literal(v)))
             if self.dependencies:
                 console.puts(
                     'Dependencies: {0}'.format(
                         ', '.join((str(context.style.literal(v)) for v in self.dependencies))))
+            utils.dump_dict_values(self.inputs, 'Inputs')
             if self.executor is not None:
                 console.puts('Executor: {0}'.format(context.style.literal(self.executor)))
             if self.max_attempts is not None:
@@ -1804,7 +1809,13 @@ class OperationBase(InstanceModelMixin):
             if self.retry_interval is not None:
                 console.puts('Retry interval: {0}'.format(
                     context.style.literal(self.retry_interval)))
-            utils.dump_dict_values(self.inputs, 'Inputs')
+            if self.plugin is not None:
+                console.puts('Plugin: {0}'.format(
+                    context.style.literal(self.plugin.name)))
+            utils.dump_dict_values(self.configuration, 'Configuration')
+            if self.function is not None:
+                console.puts('Function: {0}'.format(context.style.literal(self.function)))
+            utils.dump_dict_values(self.arguments, 'Arguments')
 
 
 class ArtifactBase(InstanceModelMixin):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/aria/modeling/service_template.py
----------------------------------------------------------------------
diff --git a/aria/modeling/service_template.py b/aria/modeling/service_template.py
index 12195a1..496aacf 100644
--- a/aria/modeling/service_template.py
+++ b/aria/modeling/service_template.py
@@ -287,7 +287,7 @@ class ServiceTemplateBase(TemplateModelMixin):
                                  service_template=self)
         context.modeling.instance = service
 
-        service.inputs = utils.create_inputs(inputs or {}, self.inputs)
+        service.inputs = utils.create_parameters(inputs or {}, self.inputs)
         # TODO: now that we have inputs, we should scan properties and inputs and evaluate functions
 
         for plugin_specification in self.plugin_specifications.itervalues():
@@ -1763,20 +1763,22 @@ class OperationTemplateBase(TemplateModelMixin):
     :vartype name: basestring
     :ivar description: Human-readable description
     :vartype description: basestring
-    :ivar plugin_specification: Associated plugin
-    :vartype plugin_specification: :class:`PluginSpecification`
     :ivar relationship_edge: When true specified that the operation is on the relationship's
                              target edge instead of its source (only used by relationship
                              operations)
     :vartype relationship_edge: bool
     :ivar implementation: Implementation (interpreted by the plugin)
     :vartype implementation: basestring
-    :ivar configuration: Configuration (interpreted by the plugin)
-    :vartype configuration: {basestring, object}
     :ivar dependencies: Dependency strings (interpreted by the plugin)
     :vartype dependencies: [basestring]
     :ivar inputs: Parameters that can be used by this operation
     :vartype inputs: {basestring: :class:`Parameter`}
+    :ivar plugin_specification: Associated plugin
+    :vartype plugin_specification: :class:`PluginSpecification`
+    :ivar configuration: Configuration (interpreted by the plugin)
+    :vartype configuration: {basestring, :class:`Parameter`}
+    :ivar function: Name of the operation function
+    :vartype function: basestring
     :ivar executor: Name of executor to run the operation with
     :vartype executor: basestring
     :ivar max_attempts: Maximum number of attempts allowed in case of failure
@@ -1856,13 +1858,17 @@ class OperationTemplateBase(TemplateModelMixin):
     def inputs(cls):
         return relationship.many_to_many(cls, 'parameter', prefix='inputs', dict_key='name')
 
+    @declared_attr
+    def configuration(cls):
+        return relationship.many_to_many(cls, 'parameter', prefix='configuration', dict_key='name')
+
     # endregion
 
     description = Column(Text)
     relationship_edge = Column(Boolean)
     implementation = Column(Text)
-    configuration = Column(modeling_types.StrictDict(key_cls=basestring))
     dependencies = Column(modeling_types.StrictList(item_cls=basestring))
+    function = Column(Text)
     executor = Column(Text)
     max_attempts = Column(Integer)
     retry_interval = Column(Integer)
@@ -1874,9 +1880,6 @@ class OperationTemplateBase(TemplateModelMixin):
             ('description', self.description),
             ('implementation', self.implementation),
             ('dependencies', self.dependencies),
-            ('executor', self.executor),
-            ('max_attempts', self.max_attempts),
-            ('retry_interval', self.retry_interval),
             ('inputs', formatting.as_raw_dict(self.inputs))))
 
     def instantiate(self, container):
@@ -1884,38 +1887,41 @@ class OperationTemplateBase(TemplateModelMixin):
         if self.plugin_specification:
             if self.plugin_specification.enabled:
                 plugin = self.plugin_specification.plugin
-                implementation = self.implementation if plugin is not None else None
+                function = self.function if plugin is not None else None
                 # "plugin" would be none if a match was not found. In that case, a validation error
                 # should already have been reported in ServiceTemplateBase.instantiate, so we will
                 # continue silently here
             else:
                 # If the plugin is disabled, the operation should be disabled, too
                 plugin = None
-                implementation = None
+                function = None
         else:
-            # Using the execution plugin
+            # Using the default execution plugin (plugin=None)
             plugin = None
-            implementation = self.implementation
+            function = self.function
 
         operation = models.Operation(name=self.name,
                                      description=deepcopy_with_locators(self.description),
                                      relationship_edge=self.relationship_edge,
-                                     plugin=plugin,
-                                     implementation=implementation,
-                                     configuration=self.configuration,
+                                     implementation=self.implementation,
                                      dependencies=self.dependencies,
                                      executor=self.executor,
+                                     plugin=plugin,
+                                     function=function,
                                      max_attempts=self.max_attempts,
                                      retry_interval=self.retry_interval,
                                      operation_template=self)
         utils.instantiate_dict(container, operation.inputs, self.inputs)
+        utils.instantiate_dict(container, operation.configuration, self.configuration)
         return operation
 
     def validate(self):
         utils.validate_dict_values(self.inputs)
+        utils.validate_dict_values(self.configuration)
 
     def coerce_values(self, report_issues):
         utils.coerce_dict_values(self.inputs, report_issues)
+        utils.coerce_dict_values(self.configuration, report_issues)
 
     def dump(self):
         context = ConsumptionContext.get_thread_local()
@@ -1923,20 +1929,13 @@ class OperationTemplateBase(TemplateModelMixin):
         if self.description:
             console.puts(context.style.meta(self.description))
         with context.style.indent:
-            if self.plugin_specification is not None:
-                console.puts('Plugin specification: {0}'.format(
-                    context.style.literal(self.plugin_specification.name)))
             if self.implementation is not None:
                 console.puts('Implementation: {0}'.format(
                     context.style.literal(self.implementation)))
-            if self.configuration:
-                with context.style.indent:
-                    for k, v in self.configuration.iteritems():
-                        console.puts('{0}: {1}'.format(context.style.property(k),
-                                                       context.style.literal(v)))
             if self.dependencies:
                 console.puts('Dependencies: {0}'.format(
                     ', '.join((str(context.style.literal(v)) for v in self.dependencies))))
+            utils.dump_dict_values(self.inputs, 'Inputs')
             if self.executor is not None:
                 console.puts('Executor: {0}'.format(context.style.literal(self.executor)))
             if self.max_attempts is not None:
@@ -1944,7 +1943,12 @@ class OperationTemplateBase(TemplateModelMixin):
             if self.retry_interval is not None:
                 console.puts('Retry interval: {0}'.format(
                     context.style.literal(self.retry_interval)))
-            utils.dump_dict_values(self.inputs, 'Inputs')
+            if self.plugin_specification is not None:
+                console.puts('Plugin specification: {0}'.format(
+                    context.style.literal(self.plugin_specification.name)))
+            utils.dump_dict_values(self.configuration, 'Configuration')
+            if self.function is not None:
+                console.puts('Function: {0}'.format(context.style.literal(self.function)))
 
 
 class ArtifactTemplateBase(TemplateModelMixin):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/aria/modeling/utils.py
----------------------------------------------------------------------
diff --git a/aria/modeling/utils.py b/aria/modeling/utils.py
index 0404fe4..6f4022c 100644
--- a/aria/modeling/utils.py
+++ b/aria/modeling/utils.py
@@ -21,6 +21,7 @@ from . import exceptions
 from ..parser.consumption import ConsumptionContext
 from ..utils.console import puts
 from ..utils.type import validate_value_type
+from ..utils.collections import OrderedDict
 
 
 class ModelJSONEncoder(JSONEncoder):
@@ -39,7 +40,7 @@ class ModelJSONEncoder(JSONEncoder):
 class NodeTemplateContainerHolder(object):
     """
     Wrapper that allows using a :class:`aria.modeling.models.NodeTemplate` model directly as the
-    ``container_holder`` argument for :func:`aria.modeling.functions.evaluate`.
+    ``container_holder`` input for :func:`aria.modeling.functions.evaluate`.
     """
 
     def __init__(self, node_template):
@@ -51,74 +52,84 @@ class NodeTemplateContainerHolder(object):
         return self.container.service_template
 
 
-def create_inputs(inputs, template_inputs):
+def create_parameters(parameters, declared_parameters):
     """
-    :param inputs: key-value dict
-    :param template_inputs: parameter name to parameter object dict
-    :return: dict of parameter name to Parameter models
+    Validates, merges, and wraps parameter values according to those declared by a type.
+
+    Exceptions will be raised for validation errors:
+
+    * :class:`aria.modeling.exceptions.UndeclaredParametersException` if a key in ``parameters``
+      does not exist in ``declared_parameters``
+    * :class:`aria.modeling.exceptions.MissingRequiredParametersException` if a key in
+      ``declared_parameters`` does not exist in ``parameters`` and also has no default value
+    * :class:`aria.modeling.exceptions.ParametersOfWrongTypeException` if a value in ``parameters``
+      does not match its type in ``declared_parameters``
+
+    :param parameters: Provided parameter values
+    :type parameters: {basestring, object}
+    :param declared_parameters: Declared parameters
+    :type declared_parameters: {basestring, :class:`aria.modeling.models.Parameter`}
+    :return: The merged parameters
+    :rtype: {basestring, :class:`aria.modeling.models.Parameter`}
     """
-    merged_inputs = _merge_and_validate_inputs(inputs, template_inputs)
+
+    merged_parameters = _merge_and_validate_parameters(parameters, declared_parameters)
 
     from . import models
-    input_models = []
-    for input_name, input_val in merged_inputs.iteritems():
+    parameters_models = OrderedDict()
+    for parameter_name, parameter_value in merged_parameters.iteritems():
         parameter = models.Parameter( # pylint: disable=unexpected-keyword-arg
-            name=input_name,
-            type_name=template_inputs[input_name].type_name,
-            description=template_inputs[input_name].description,
-            value=input_val)
-        input_models.append(parameter)
+            name=parameter_name,
+            type_name=declared_parameters[parameter_name].type_name,
+            description=declared_parameters[parameter_name].description,
+            value=parameter_value)
+        parameters_models[parameter.name] = parameter
 
-    return dict((inp.name, inp) for inp in input_models)
+    return parameters_models
 
 
-def _merge_and_validate_inputs(inputs, template_inputs):
-    """
-    :param inputs: key-value dict
-    :param template_inputs: parameter name to parameter object dict
-    :return:
-    """
-    merged_inputs = inputs.copy()
-
-    missing_inputs = []
-    wrong_type_inputs = {}
-    for input_name, input_template in template_inputs.iteritems():
-        if input_name not in inputs:
-            if input_template.value is not None:
-                merged_inputs[input_name] = input_template.value  # apply default value
+def _merge_and_validate_parameters(parameters, declared_parameters):
+    merged_parameters = OrderedDict(parameters)
+
+    missing_parameters = []
+    wrong_type_parameters = OrderedDict()
+    for parameter_name, declared_parameter in declared_parameters.iteritems():
+        if parameter_name not in parameters:
+            if declared_parameter.value is not None:
+                merged_parameters[parameter_name] = declared_parameter.value  # apply default value
             else:
-                missing_inputs.append(input_name)
+                missing_parameters.append(parameter_name)
         else:
-            # Validate input type
+            # Validate parameter type
             try:
-                validate_value_type(inputs[input_name], input_template.type_name)
+                validate_value_type(parameters[parameter_name], declared_parameter.type_name)
             except ValueError:
-                wrong_type_inputs[input_name] = input_template.type_name
+                wrong_type_parameters[parameter_name] = declared_parameter.type_name
             except RuntimeError:
                 # TODO: This error shouldn't be raised (or caught), but right now we lack support
                 # for custom data_types, which will raise this error. Skipping their validation.
                 pass
 
-    if missing_inputs:
-        raise exceptions.MissingRequiredInputsException(
-            'Required inputs {0} have not been specified - expected inputs: {1}'
-            .format(missing_inputs, template_inputs.keys()))
+    if missing_parameters:
+        raise exceptions.MissingRequiredParametersException(
+            'Required parameters {0} have not been specified; Expected parameters: {1}'
+            .format(missing_parameters, declared_parameters.keys()))
 
-    if wrong_type_inputs:
+    if wrong_type_parameters:
         error_message = StringIO()
-        for param_name, param_type in wrong_type_inputs.iteritems():
-            error_message.write('Input "{0}" must be of type {1}{2}'
+        for param_name, param_type in wrong_type_parameters.iteritems():
+            error_message.write('Parameter "{0}" must be of type {1}{2}'
                                 .format(param_name, param_type, os.linesep))
-        raise exceptions.InputsOfWrongTypeException(error_message.getvalue())
+        raise exceptions.ParametersOfWrongTypeException(error_message.getvalue())
 
-    undeclared_inputs = [input_name for input_name in inputs.keys()
-                         if input_name not in template_inputs]
-    if undeclared_inputs:
-        raise exceptions.UndeclaredInputsException(
-            'Undeclared inputs have been specified: {0}; Expected inputs: {1}'
-            .format(undeclared_inputs, template_inputs.keys()))
+    undeclared_parameters = [parameter_name for parameter_name in parameters.keys()
+                             if parameter_name not in declared_parameters]
+    if undeclared_parameters:
+        raise exceptions.UndeclaredParametersException(
+            'Undeclared parameters have been specified: {0}; Expected parameters: {1}'
+            .format(undeclared_parameters, declared_parameters.keys()))
 
-    return merged_inputs
+    return merged_parameters
 
 
 def coerce_dict_values(the_dict, report_issues=False):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/aria/orchestrator/execution_plugin/instantiation.py
----------------------------------------------------------------------
diff --git a/aria/orchestrator/execution_plugin/instantiation.py b/aria/orchestrator/execution_plugin/instantiation.py
index c09434e..26c3913 100644
--- a/aria/orchestrator/execution_plugin/instantiation.py
+++ b/aria/orchestrator/execution_plugin/instantiation.py
@@ -16,19 +16,13 @@
 # TODO: this module will eventually be moved to a new "aria.instantiation" package
 
 from ...utils.type import full_type_name
-from ...utils.collections import OrderedDict
+from ...utils.formatting import safe_repr
 from ...parser import validation
 from ...parser.consumption import ConsumptionContext
+from ...modeling.functions import Function
 
 
 def configure_operation(operation):
-    configuration = OrderedDict(operation.configuration) if operation.configuration else {}
-
-    arguments = OrderedDict()
-    arguments['script_path'] = operation.implementation
-    arguments['process'] = _get_process(configuration.pop('process')) \
-        if 'process' in configuration else dict()
-
     host = None
     interface = operation.interface
     if interface.node is not None:
@@ -36,87 +30,118 @@ def configure_operation(operation):
     elif interface.relationship is not None:
         if operation.relationship_edge is True:
             host = interface.relationship.target_node.host
-        else: # either False or None
+        else: # either False or None (None meaning that edge was not specified)
             host = interface.relationship.source_node.host
 
+    _configure_common(operation)
     if host is None:
         _configure_local(operation)
     else:
-        _configure_remote(operation, configuration, arguments)
+        _configure_remote(operation)
+
+    # Any remaining un-handled configuration parameters will become extra arguments, available as
+    # kwargs in either "run_script_locally" or "run_script_with_ssh"
+    for key, value in operation.configuration.iteritems():
+        if key not in ('process', 'ssh'):
+            operation.arguments[key] = value.instantiate()
 
-    # Any remaining unhandled configuration values will become extra arguments, available as kwargs
-    # in either "run_script_locally" or "run_script_with_ssh"
-    arguments.update(configuration)
 
-    return arguments
+def _configure_common(operation):
+    """
+    Local and remote operations.
+    """
+
+    from ...modeling.models import Parameter
+    operation.arguments['script_path'] = Parameter.wrap('script_path', operation.implementation,
+                                                        'Relative path to the executable file.')
+    operation.arguments['process'] = Parameter.wrap('process', _get_process(operation),
+                                                    'Sub-process configuration.')
+
 
 def _configure_local(operation):
     """
     Local operation.
     """
+
     from . import operations
-    operation.implementation = '{0}.{1}'.format(operations.__name__,
-                                                operations.run_script_locally.__name__)
+    operation.function = '{0}.{1}'.format(operations.__name__,
+                                          operations.run_script_locally.__name__)
 
 
-def _configure_remote(operation, configuration, arguments):
+def _configure_remote(operation):
     """
     Remote SSH operation via Fabric.
     """
+
+    from ...modeling.models import Parameter
+    from . import operations
+
+    ssh = _get_ssh(operation)
+
+    # Defaults
     # TODO: find a way to configure these generally in the service template
     default_user = ''
     default_password = ''
-
-    ssh = _get_ssh(configuration.pop('ssh')) if 'ssh' in configuration else {}
     if 'user' not in ssh:
         ssh['user'] = default_user
     if ('password' not in ssh) and ('key' not in ssh) and ('key_filename' not in ssh):
         ssh['password'] = default_password
 
-    arguments['use_sudo'] = ssh.get('use_sudo', False)
-    arguments['hide_output'] = ssh.get('hide_output', [])
-    arguments['fabric_env'] = {}
+    operation.arguments['use_sudo'] = Parameter.wrap('use_sudo', ssh.get('use_sudo', False),
+                                                     'Whether to execute with sudo.')
+
+    operation.arguments['hide_output'] = Parameter.wrap('hide_output', ssh.get('hide_output', []),
+                                                        'Hide output of these Fabric groups.')
+
+    fabric_env = {}
     if 'warn_only' in ssh:
-        arguments['fabric_env']['warn_only'] = ssh['warn_only']
-    arguments['fabric_env']['user'] = ssh.get('user')
-    arguments['fabric_env']['password'] = ssh.get('password')
-    arguments['fabric_env']['key'] = ssh.get('key')
-    arguments['fabric_env']['key_filename'] = ssh.get('key_filename')
+        fabric_env['warn_only'] = ssh['warn_only']
+    fabric_env['user'] = ssh.get('user')
+    fabric_env['password'] = ssh.get('password')
+    fabric_env['key'] = ssh.get('key')
+    fabric_env['key_filename'] = ssh.get('key_filename')
     if 'address' in ssh:
-        arguments['fabric_env']['host_string'] = ssh['address']
+        fabric_env['host_string'] = ssh['address']
 
-    if arguments['fabric_env'].get('user') is None:
+    # Make sure we have a user
+    if fabric_env.get('user') is None:
         context = ConsumptionContext.get_thread_local()
         context.validation.report('must configure "ssh.user" for "{0}"'
                                   .format(operation.implementation),
                                   level=validation.Issue.BETWEEN_TYPES)
-    if (arguments['fabric_env'].get('password') is None) and \
-        (arguments['fabric_env'].get('key') is None) and \
-        (arguments['fabric_env'].get('key_filename') is None):
+
+    # Make sure we have an authentication value
+    if (fabric_env.get('password') is None) and \
+        (fabric_env.get('key') is None) and \
+        (fabric_env.get('key_filename') is None):
         context = ConsumptionContext.get_thread_local()
         context.validation.report('must configure "ssh.password", "ssh.key", or "ssh.key_filename" '
                                   'for "{0}"'
                                   .format(operation.implementation),
                                   level=validation.Issue.BETWEEN_TYPES)
 
-    from . import operations
-    operation.implementation = '{0}.{1}'.format(operations.__name__,
-                                                operations.run_script_with_ssh.__name__)
+    operation.arguments['fabric_env'] = Parameter.wrap('fabric_env', fabric_env,
+                                                       'Fabric configuration.')
 
+    operation.function = '{0}.{1}'.format(operations.__name__,
+                                          operations.run_script_with_ssh.__name__)
 
-def _get_process(value):
+
+def _get_process(operation):
+    value = operation.configuration.get('process')._value \
+        if 'process' in operation.configuration else None
     if value is None:
-        return None
+        return {}
     _validate_type(value, dict, 'process')
     for k, v in value.iteritems():
         if k == 'eval_python':
-            value[k] = _str_to_bool(v, 'process.eval_python')
+            value[k] = _coerce_bool(v, 'process.eval_python')
         elif k == 'cwd':
             _validate_type(v, basestring, 'process.cwd')
         elif k == 'command_prefix':
             _validate_type(v, basestring, 'process.command_prefix')
         elif k == 'args':
-            value[k] = _dict_to_list(v, 'process.args')
+            value[k] = _dict_to_list_of_strings(v, 'process.args')
         elif k == 'env':
             _validate_type(v, dict, 'process.env')
         else:
@@ -126,17 +151,19 @@ def _get_process(value):
     return value
 
 
-def _get_ssh(value):
+def _get_ssh(operation):
+    value = operation.configuration.get('ssh')._value \
+        if 'process' in operation.configuration else None
     if value is None:
         return {}
     _validate_type(value, dict, 'ssh')
     for k, v in value.iteritems():
         if k == 'use_sudo':
-            value[k] = _str_to_bool(v, 'ssh.use_sudo')
+            value[k] = _coerce_bool(v, 'ssh.use_sudo')
         elif k == 'hide_output':
-            value[k] = _dict_to_list(v, 'ssh.hide_output')
+            value[k] = _dict_to_list_of_strings(v, 'ssh.hide_output')
         elif k == 'warn_only':
-            value[k] = _str_to_bool(v, 'ssh.warn_only')
+            value[k] = _coerce_bool(v, 'ssh.warn_only')
         elif k == 'user':
             _validate_type(v, basestring, 'ssh.user')
         elif k == 'password':
@@ -155,16 +182,20 @@ def _get_ssh(value):
 
 
 def _validate_type(value, the_type, name):
+    if isinstance(value, Function):
+        return
     if not isinstance(value, the_type):
         context = ConsumptionContext.get_thread_local()
-        context.validation.report('"{0}" configuration is not a {1}'
-                                  .format(name, full_type_name(the_type)),
+        context.validation.report('"{0}" configuration is not a {1}: {2}'
+                                  .format(name, full_type_name(the_type), safe_repr(value)),
                                   level=validation.Issue.BETWEEN_TYPES)
 
 
-def _str_to_bool(value, name):
+def _coerce_bool(value, name):
     if value is None:
         return None
+    if isinstance(value, bool):
+        return value
     _validate_type(value, basestring, name)
     if value == 'true':
         return True
@@ -173,19 +204,15 @@ def _str_to_bool(value, name):
     else:
         context = ConsumptionContext.get_thread_local()
         context.validation.report('"{0}" configuration is not "true" or "false": {1}'
-                                  .format(name, repr(value)),
+                                  .format(name, safe_repr(value)),
                                   level=validation.Issue.BETWEEN_TYPES)
 
 
-def _dict_to_list(the_dict, name):
+def _dict_to_list_of_strings(the_dict, name):
     _validate_type(the_dict, dict, name)
     value = []
     for k in sorted(the_dict):
         v = the_dict[k]
-        if not isinstance(v, basestring):
-            context = ConsumptionContext.get_thread_local()
-            context.validation.report('"{0}.{1}" configuration is not a string: {2}'
-                                      .format(name, k, repr(v)),
-                                      level=validation.Issue.BETWEEN_TYPES)
+        _validate_type(v, basestring, '{0}.{1}'.format(name, k))
         value.append(v)
     return value

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/aria/orchestrator/workflow_runner.py
----------------------------------------------------------------------
diff --git a/aria/orchestrator/workflow_runner.py b/aria/orchestrator/workflow_runner.py
index 8f25cce..0c6321f 100644
--- a/aria/orchestrator/workflow_runner.py
+++ b/aria/orchestrator/workflow_runner.py
@@ -119,7 +119,7 @@ class WorkflowRunner(object):
         else:
             workflow_inputs = self.service.workflows[self._workflow_name].inputs
 
-        execution.inputs = modeling_utils.create_inputs(inputs, workflow_inputs)
+        execution.inputs = modeling_utils.create_parameters(inputs, workflow_inputs)
         # TODO: these two following calls should execute atomically
         self._validate_no_active_executions(execution)
         self._model_storage.execution.put(execution)

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/aria/orchestrator/workflows/api/task.py
----------------------------------------------------------------------
diff --git a/aria/orchestrator/workflows/api/task.py b/aria/orchestrator/workflows/api/task.py
index cb79eb3..aa6ac45 100644
--- a/aria/orchestrator/workflows/api/task.py
+++ b/aria/orchestrator/workflows/api/task.py
@@ -99,8 +99,8 @@ class OperationTask(BaseTask):
 
         operation = self.actor.interfaces[self.interface_name].operations[self.operation_name]
         self.plugin = operation.plugin
-        self.inputs = modeling_utils.create_inputs(inputs or {}, operation.inputs)
-        self.implementation = operation.implementation
+        self.inputs = modeling_utils.create_parameters(inputs or {}, operation.arguments)
+        self.implementation = operation.function
 
     def __repr__(self):
         return self.name

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/aria/orchestrator/workflows/core/task.py
----------------------------------------------------------------------
diff --git a/aria/orchestrator/workflows/core/task.py b/aria/orchestrator/workflows/core/task.py
index b3dfb3c..0d6eb11 100644
--- a/aria/orchestrator/workflows/core/task.py
+++ b/aria/orchestrator/workflows/core/task.py
@@ -148,7 +148,6 @@ class OperationTask(BaseTask):
             plugin=api_task.plugin,
             implementation=api_task.implementation,
             inputs=api_task.inputs
-
         )
         self._workflow_context.model.task.put(task_model)
 

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/extensions/aria_extension_tosca/profiles/aria-1.0/aria-1.0.yaml
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/profiles/aria-1.0/aria-1.0.yaml b/extensions/aria_extension_tosca/profiles/aria-1.0/aria-1.0.yaml
index 0c5e77f..abac03b 100644
--- a/extensions/aria_extension_tosca/profiles/aria-1.0/aria-1.0.yaml
+++ b/extensions/aria_extension_tosca/profiles/aria-1.0/aria-1.0.yaml
@@ -52,18 +52,10 @@ policy_types:
       should be inherited and extended with additional properties.
     derived_from: tosca.policies.Root
     properties:
-      implementation:
+      function:
         description: >-
-          The interpretation of the implementation string depends on the orchestrator. In ARIA it is
-          the full path to a Python @workflow function that generates a task graph based on the
-          service topology.
+          The interpretation of the function string depends on the orchestrator. In ARIA it is the
+          full path to a Python @workflow function that generates a task graph based on the service
+          topology.
         type: string
         required: true
-      dependencies:
-        description: >-
-          The optional ordered list of one or more dependent or secondary implementation artifact
-          name which are referenced by the primary implementation artifact (e.g., a library the
-          script installs or a secondary script).
-        type: list
-        entry_schema: string
-        required: false

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/extensions/aria_extension_tosca/simple_v1_0/assignments.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/assignments.py b/extensions/aria_extension_tosca/simple_v1_0/assignments.py
index d929ce0..79f6377 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/assignments.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/assignments.py
@@ -23,7 +23,7 @@ from aria.parser.presentation import (AsIsPresentation, has_fields, allow_unknow
 
 from .filters import NodeFilter
 from .misc import Description, OperationImplementation
-from .modeling.properties import get_assigned_and_defined_property_values
+from .modeling.parameters import get_assigned_and_defined_parameter_values
 from .presentation.extensible import ExtensiblePresentation
 from .presentation.field_validators import (node_template_or_type_validator,
                                             relationship_template_or_type_validator,
@@ -428,7 +428,7 @@ class ArtifactAssignment(ExtensiblePresentation):
 
     @cachedmethod
     def _get_property_values(self, context):
-        return FrozenDict(get_assigned_and_defined_property_values(context, self))
+        return FrozenDict(get_assigned_and_defined_parameter_values(context, self, 'property'))
 
     @cachedmethod
     def _validate(self, context):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/extensions/aria_extension_tosca/simple_v1_0/modeling/__init__.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/modeling/__init__.py b/extensions/aria_extension_tosca/simple_v1_0/modeling/__init__.py
index 99389e4..0b04fdc 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/__init__.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/modeling/__init__.py
@@ -26,14 +26,17 @@ import re
 from types import FunctionType
 from datetime import datetime
 
+from ruamel import yaml
+
 from aria.parser.validation import Issue
-from aria.utils.collections import StrictDict
+from aria.utils.collections import (StrictDict, OrderedDict)
 from aria.modeling.models import (Type, ServiceTemplate, NodeTemplate,
                                   RequirementTemplate, RelationshipTemplate, CapabilityTemplate,
                                   GroupTemplate, PolicyTemplate, SubstitutionTemplate,
                                   SubstitutionTemplateMapping, InterfaceTemplate, OperationTemplate,
                                   ArtifactTemplate, Metadata, Parameter, PluginSpecification)
 
+from .parameters import coerce_parameter_value
 from .constraints import (Equal, GreaterThan, GreaterOrEqual, LessThan, LessOrEqual, InRange,
                           ValidValues, Length, MinLength, MaxLength, Pattern)
 from ..data_types import coerce_value
@@ -375,7 +378,7 @@ def create_operation_template_model(context, service_template, operation):
     implementation = operation.implementation
     if implementation is not None:
         primary = implementation.primary
-        parse_implementation_string(context, service_template, operation, model, primary)
+        set_implementation(context, service_template, operation, model, primary)
         relationship_edge = operation._get_extensions(context).get('relationship_edge')
         if relationship_edge is not None:
             if relationship_edge == 'source':
@@ -384,18 +387,37 @@ def create_operation_template_model(context, service_template, operation):
                 model.relationship_edge = True
 
         dependencies = implementation.dependencies
+        configuration = OrderedDict()
         if dependencies:
             for dependency in dependencies:
                 key, value = split_prefix(dependency)
                 if key is not None:
-                    if model.configuration is None:
-                        model.configuration = {}
-                    set_nested(model.configuration, key.split('.'), value)
+                    # Parse as YAML
+                    try:
+                        value = yaml.load(value)
+                    except yaml.parser.MarkedYAMLError as e:
+                        context.validation.report(
+                            'YAML parser {0} in operation configuration: {1}'
+                            .format(e.problem, value),
+                            locator=implementation._locator,
+                            level=Issue.FIELD)
+                        continue
+
+                    # Coerce to intrinsic functions, if there are any
+                    value = coerce_parameter_value(context, implementation, None, value).value
+
+                    # Support dot-notation nesting
+                    set_nested(configuration, key.split('.'), value)
                 else:
                     if model.dependencies is None:
                         model.dependencies = []
                     model.dependencies.append(dependency)
 
+        # Convert configuration to Parameter models
+        for key, value in configuration.iteritems():
+            model.configuration[key] = Parameter.wrap(key, value,
+                                                      description='Operation configuration.')
+
     inputs = operation.inputs
     if inputs:
         for input_name, the_input in inputs.iteritems():
@@ -490,15 +512,15 @@ def create_workflow_operation_template_model(context, service_template, policy):
 
     properties = policy._get_property_values(context)
     for prop_name, prop in properties.iteritems():
-        if prop_name == 'implementation':
-            parse_implementation_string(context, service_template, policy, model, prop.value)
+        if prop_name == 'function':
+            model.function = prop.value
         elif prop_name == 'dependencies':
             model.dependencies = prop.value
         else:
-            model.inputs[prop_name] = Parameter(name=prop_name, # pylint: disable=unexpected-keyword-arg
-                                                type_name=prop.type,
-                                                value=prop.value,
-                                                description=prop.description)
+            model.configuration[prop_name] = Parameter(name=prop_name, # pylint: disable=unexpected-keyword-arg
+                                                       type_name=prop.type,
+                                                       value=prop.value,
+                                                       description=prop.description)
 
     return model
 
@@ -639,12 +661,12 @@ def create_constraint(context, node_filter, constraint_clause, property_name, ca
 
 def split_prefix(string):
     """
-    Splits the prefix on the first unescaped ">".
+    Splits the prefix on the first non-escaped ">".
     """
 
-    split = IMPLEMENTATION_PREFIX_REGEX.split(string, 2)
+    split = IMPLEMENTATION_PREFIX_REGEX.split(string, 1)
     if len(split) < 2:
-        return None, string
+        return None, None
     return split[0].strip(), split[1].lstrip()
 
 
@@ -671,13 +693,18 @@ def set_nested(the_dict, keys, value):
         set_nested(the_dict[key], keys, value)
 
 
-def parse_implementation_string(context, service_template, presentation, model, implementation):
-    plugin_name, model.implementation = split_prefix(implementation)
-    if plugin_name is not None:
-        model.plugin_specification = service_template.plugin_specifications.get(plugin_name)
+def set_implementation(context, service_template, presentation, model, primary):
+    prefix, postfix = split_prefix(primary)
+    if prefix:
+        # Special ARIA prefix
+        model.plugin_specification = service_template.plugin_specifications.get(prefix)
+        model.function = postfix
         if model.plugin_specification is None:
             context.validation.report(
                 'no policy for plugin "{0}" specified in operation implementation: {1}'
-                .format(plugin_name, implementation),
+                .format(prefix, primary),
                 locator=presentation._get_child_locator('properties', 'implementation'),
                 level=Issue.BETWEEN_TYPES)
+    else:
+        # Standard TOSCA artifact
+        model.implementation = primary

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/extensions/aria_extension_tosca/simple_v1_0/modeling/artifacts.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/modeling/artifacts.py b/extensions/aria_extension_tosca/simple_v1_0/modeling/artifacts.py
index 4f61ef5..dd9eeb4 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/artifacts.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/modeling/artifacts.py
@@ -15,11 +15,11 @@
 
 from aria.utils.collections import OrderedDict
 
+
 #
 # NodeType, NodeTemplate
 #
 
-
 def get_inherited_artifact_definitions(context, presentation, for_presentation=None):
 
     if hasattr(presentation, '_get_type'):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/extensions/aria_extension_tosca/simple_v1_0/modeling/capabilities.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/modeling/capabilities.py b/extensions/aria_extension_tosca/simple_v1_0/modeling/capabilities.py
index 6df7177..a90a9fc 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/capabilities.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/modeling/capabilities.py
@@ -16,8 +16,9 @@
 from aria.utils.collections import deepcopy_with_locators, OrderedDict
 from aria.parser.validation import Issue
 
-from .properties import (convert_property_definitions_to_values, merge_raw_property_definitions,
-                         get_assigned_and_defined_property_values)
+from .parameters import (convert_parameter_definitions_to_values, merge_raw_parameter_definitions,
+                         get_assigned_and_defined_parameter_values)
+
 
 #
 # CapabilityType
@@ -38,6 +39,7 @@ def get_inherited_valid_source_types(context, presentation):
 
     return valid_source_types
 
+
 #
 # NodeType
 #
@@ -92,6 +94,7 @@ def get_inherited_capability_definitions(context, presentation, for_presentation
 
     return capability_definitions
 
+
 #
 # NodeTemplate
 #
@@ -127,8 +130,9 @@ def get_template_capabilities(context, presentation):
                 capability_assignment = capability_assignments[capability_name]
 
                 # Assign properties
-                values = get_assigned_and_defined_property_values(context,
-                                                                  our_capability_assignment)
+                values = get_assigned_and_defined_parameter_values(context,
+                                                                   our_capability_assignment,
+                                                                   'property')
                 if values:
                     capability_assignment._raw['properties'] = values
             else:
@@ -139,6 +143,7 @@ def get_template_capabilities(context, presentation):
 
     return capability_assignments
 
+
 #
 # Utils
 #
@@ -150,24 +155,25 @@ def convert_capability_from_definition_to_assignment(context, presentation, cont
 
     properties = presentation.properties
     if properties is not None:
-        raw['properties'] = convert_property_definitions_to_values(context, properties)
+        raw['properties'] = convert_parameter_definitions_to_values(context, properties)
 
     # TODO attributes
 
     return CapabilityAssignment(name=presentation._name, raw=raw, container=container)
 
+
 def merge_capability_definition_from_type(context, presentation, capability_definition):
     raw_properties = OrderedDict()
 
     # Merge properties from type
     the_type = capability_definition._get_type(context)
     type_property_defintions = the_type._get_properties(context)
-    merge_raw_property_definitions(context, presentation, raw_properties, type_property_defintions,
-                                   'properties')
+    merge_raw_parameter_definitions(context, presentation, raw_properties, type_property_defintions,
+                                    'properties')
 
     # Merge our properties
-    merge_raw_property_definitions(context, presentation, raw_properties,
-                                   capability_definition.properties, 'properties')
+    merge_raw_parameter_definitions(context, presentation, raw_properties,
+                                    capability_definition.properties, 'properties')
 
     if raw_properties:
         capability_definition._raw['properties'] = raw_properties

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/extensions/aria_extension_tosca/simple_v1_0/modeling/constraints.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/modeling/constraints.py b/extensions/aria_extension_tosca/simple_v1_0/modeling/constraints.py
index 7c99eab..9a30cc1 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/constraints.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/modeling/constraints.py
@@ -15,7 +15,7 @@
 
 import re
 
-from aria.modeling.contraints import NodeTemplateConstraint
+from aria.modeling.constraints import NodeTemplateConstraint
 from aria.modeling.utils import NodeTemplateContainerHolder
 from aria.modeling.functions import evaluate
 from aria.parser import implements_specification

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/extensions/aria_extension_tosca/simple_v1_0/modeling/data_types.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/modeling/data_types.py b/extensions/aria_extension_tosca/simple_v1_0/modeling/data_types.py
index 3952785..c0d79e5 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/data_types.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/modeling/data_types.py
@@ -26,6 +26,7 @@ from aria.parser.validation import Issue
 from .functions import get_function
 from ..presentation.types import get_type_by_full_or_shorthand_name
 
+
 #
 # DataType
 #
@@ -50,6 +51,7 @@ def get_inherited_constraints(context, presentation):
 
     return constraints
 
+
 def coerce_data_type_value(context, presentation, data_type, entry_schema, constraints, value, # pylint: disable=unused-argument
                            aspect):
     """
@@ -121,6 +123,7 @@ def coerce_data_type_value(context, presentation, data_type, entry_schema, const
 
     return value
 
+
 def validate_data_type_name(context, presentation):
     """
     Makes sure the complex data type's name is not that of a built-in type.
@@ -132,6 +135,7 @@ def validate_data_type_name(context, presentation):
                                   % safe_repr(name),
                                   locator=presentation._locator, level=Issue.BETWEEN_TYPES)
 
+
 #
 # PropertyDefinition, AttributeDefinition, EntrySchema, DataType
 #
@@ -172,6 +176,7 @@ def get_data_type(context, presentation, field_name, allow_none=False):
     # Try primitive data type
     return get_primitive_data_type(type_name)
 
+
 #
 # PropertyDefinition, EntrySchema
 #
@@ -195,6 +200,7 @@ def get_property_constraints(context, presentation):
 
     return constraints
 
+
 #
 # ConstraintClause
 #
@@ -310,6 +316,7 @@ def apply_constraint_to_value(context, presentation, constraint_clause, value):
 
     return True
 
+
 #
 # Repository
 #
@@ -326,6 +333,7 @@ def get_data_type_value(context, presentation, field_name, type_name):
                                   locator=presentation._locator, level=Issue.BETWEEN_TYPES)
     return None
 
+
 #
 # Utils
 #
@@ -345,6 +353,7 @@ PRIMITIVE_DATA_TYPES = {
     'boolean': bool,
     'null': None.__class__}
 
+
 @implements_specification('3.2.1-3', 'tosca-simple-1.0')
 def get_primitive_data_type(type_name):
     """
@@ -358,6 +367,7 @@ def get_primitive_data_type(type_name):
 
     return PRIMITIVE_DATA_TYPES.get(type_name)
 
+
 def get_data_type_name(the_type):
     """
     Returns the name of the type, whether it's a DataType, a primitive type, or another class.
@@ -365,6 +375,7 @@ def get_data_type_name(the_type):
 
     return the_type._name if hasattr(the_type, '_name') else full_type_name(the_type)
 
+
 def coerce_value(context, presentation, the_type, entry_schema, constraints, value, aspect=None): # pylint: disable=too-many-return-statements
     """
     Returns the value after it's coerced to its type, reporting validation errors if it cannot be
@@ -410,6 +421,7 @@ def coerce_value(context, presentation, the_type, entry_schema, constraints, val
     # Coerce to primitive type
     return coerce_to_primitive(context, presentation, the_type, constraints, value, aspect)
 
+
 def coerce_to_primitive(context, presentation, primitive_type, constraints, value, aspect=None):
     """
     Returns the value after it's coerced to a primitive type, translating exceptions to validation
@@ -435,6 +447,7 @@ def coerce_to_primitive(context, presentation, primitive_type, constraints, valu
 
     return value
 
+
 def coerce_to_data_type_class(context, presentation, cls, entry_schema, constraints, value,
                               aspect=None):
     """
@@ -463,6 +476,7 @@ def coerce_to_data_type_class(context, presentation, cls, entry_schema, constrai
 
     return value
 
+
 def apply_constraints_to_value(context, presentation, constraints, value):
     """
     Applies all constraints to the value. If the value conforms, returns the value. If it does not
@@ -478,6 +492,7 @@ def apply_constraints_to_value(context, presentation, constraints, value):
             value = None
     return value
 
+
 def get_container_data_type(presentation):
     if presentation is None:
         return None
@@ -485,6 +500,7 @@ def get_container_data_type(presentation):
         return presentation
     return get_container_data_type(presentation._container)
 
+
 def report_issue_for_bad_format(context, presentation, the_type, value, aspect, e):
     if aspect == 'default':
         aspect = '"default" value'

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/extensions/aria_extension_tosca/simple_v1_0/modeling/interfaces.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/modeling/interfaces.py b/extensions/aria_extension_tosca/simple_v1_0/modeling/interfaces.py
index 3e6aa6f..e04ac4a 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/interfaces.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/modeling/interfaces.py
@@ -13,11 +13,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from aria.utils.collections import merge, deepcopy_with_locators, OrderedDict
+from aria.utils.collections import (merge, deepcopy_with_locators, OrderedDict)
 from aria.parser.presentation import get_locator
 from aria.parser.validation import Issue
 
-from .properties import (coerce_property_value, convert_property_definitions_to_values)
+from .parameters import (coerce_parameter_value, convert_parameter_definitions_to_values)
+
 
 #
 # InterfaceType
@@ -45,6 +46,7 @@ def get_inherited_operations(context, presentation):
 
     return operations
 
+
 #
 # InterfaceDefinition
 #
@@ -73,6 +75,7 @@ def get_and_override_input_definitions_from_type(context, presentation):
 
     return inputs
 
+
 def get_and_override_operation_definitions_from_type(context, presentation):
     """
     Returns our operation definitions added on top of those of the interface type, if specified.
@@ -96,6 +99,7 @@ def get_and_override_operation_definitions_from_type(context, presentation):
 
     return operations
 
+
 #
 # NodeType, RelationshipType, GroupType
 #
@@ -124,6 +128,7 @@ def get_inherited_interface_definitions(context, presentation, type_name, for_pr
 
     return interfaces
 
+
 #
 # NodeTemplate, RelationshipTemplate, GroupTemplate
 #
@@ -186,6 +191,7 @@ def get_template_interfaces(context, presentation, type_name):
 
     return template_interfaces
 
+
 #
 # Utils
 #
@@ -200,13 +206,14 @@ def convert_interface_definition_from_type_to_template(context, presentation, co
     raw = convert_interface_definition_from_type_to_raw_template(context, presentation)
     return InterfaceAssignment(name=presentation._name, raw=raw, container=container)
 
+
 def convert_interface_definition_from_type_to_raw_template(context, presentation): # pylint: disable=invalid-name
     raw = OrderedDict()
 
     # Copy default values for inputs
     inputs = presentation._get_inputs(context)
     if inputs is not None:
-        raw['inputs'] = convert_property_definitions_to_values(context, inputs)
+        raw['inputs'] = convert_parameter_definitions_to_values(context, inputs)
 
     # Copy operations
     operations = presentation._get_operations(context)
@@ -221,11 +228,12 @@ def convert_interface_definition_from_type_to_raw_template(context, presentation
                 raw[operation_name]['implementation'] = deepcopy_with_locators(implementation._raw)
             inputs = operation.inputs
             if inputs is not None:
-                raw[operation_name]['inputs'] = convert_property_definitions_to_values(context,
-                                                                                       inputs)
+                raw[operation_name]['inputs'] = convert_parameter_definitions_to_values(context,
+                                                                                        inputs)
 
     return raw
 
+
 def convert_requirement_interface_definitions_from_type_to_raw_template(context, raw_requirement, # pylint: disable=invalid-name
                                                                         interface_definitions):
     if not interface_definitions:
@@ -240,6 +248,7 @@ def convert_requirement_interface_definitions_from_type_to_raw_template(context,
         else:
             raw_requirement['interfaces'][interface_name] = raw_interface
 
+
 def merge_interface(context, presentation, interface_assignment, our_interface_assignment,
                     interface_definition, interface_name):
     # Assign/merge interface inputs
@@ -282,6 +291,7 @@ def merge_interface(context, presentation, interface_assignment, our_interface_a
                               our_input_assignments, input_definitions, interface_name,
                               operation_name, presentation)
 
+
 def merge_raw_input_definition(context, the_raw_input, our_input, interface_name, operation_name,
                                presentation, type_name):
     # Check if we changed the type
@@ -305,6 +315,7 @@ def merge_raw_input_definition(context, the_raw_input, our_input, interface_name
     # Merge
     merge(the_raw_input, our_input._raw)
 
+
 def merge_input_definitions(context, inputs, our_inputs, interface_name, operation_name,
                             presentation, type_name):
     for input_name, our_input in our_inputs.iteritems():
@@ -314,6 +325,7 @@ def merge_input_definitions(context, inputs, our_inputs, interface_name, operati
         else:
             inputs[input_name] = our_input._clone(presentation)
 
+
 def merge_raw_input_definitions(context, raw_inputs, our_inputs, interface_name, operation_name,
                                 presentation, type_name):
     for input_name, our_input in our_inputs.iteritems():
@@ -323,6 +335,7 @@ def merge_raw_input_definitions(context, raw_inputs, our_inputs, interface_name,
         else:
             raw_inputs[input_name] = deepcopy_with_locators(our_input._raw)
 
+
 def merge_raw_operation_definition(context, raw_operation, our_operation, interface_name,
                                    presentation, type_name):
     if not isinstance(our_operation._raw, dict):
@@ -353,6 +366,7 @@ def merge_raw_operation_definition(context, raw_operation, our_operation, interf
             raw_operation['implementation'] = \
                 deepcopy_with_locators(our_operation._raw['implementation'])
 
+
 def merge_operation_definitions(context, operations, our_operations, interface_name, presentation,
                                 type_name):
     if not our_operations:
@@ -364,6 +378,7 @@ def merge_operation_definitions(context, operations, our_operations, interface_n
         else:
             operations[operation_name] = our_operation._clone(presentation)
 
+
 def merge_raw_operation_definitions(context, raw_operations, our_operations, interface_name,
                                     presentation, type_name):
     for operation_name, our_operation in our_operations.iteritems():
@@ -378,6 +393,7 @@ def merge_raw_operation_definitions(context, raw_operations, our_operations, int
         else:
             raw_operations[operation_name] = deepcopy_with_locators(our_operation._raw)
 
+
 # From either an InterfaceType or an InterfaceDefinition:
 def merge_interface_definition(context, interface, our_source, presentation, type_name):
     if hasattr(our_source, 'type'):
@@ -408,6 +424,7 @@ def merge_interface_definition(context, interface, our_source, presentation, typ
         merge_raw_operation_definitions(context, interface._raw, our_operations, our_source._name,
                                         presentation, type_name)
 
+
 def merge_interface_definitions(context, interfaces, our_interfaces, presentation,
                                 for_presentation=None):
     if not our_interfaces:
@@ -419,12 +436,14 @@ def merge_interface_definitions(context, interfaces, our_interfaces, presentatio
         else:
             interfaces[name] = our_interface._clone(for_presentation)
 
+
 def merge_interface_definitions_from_their_types(context, interfaces, presentation):
     for interface in interfaces.itervalues():
         the_type = interface._get_type(context) # InterfaceType
         if the_type is not None:
             merge_interface_definition(context, interface, the_type, presentation, 'type')
 
+
 def assign_raw_inputs(context, values, assignments, definitions, interface_name, operation_name,
                       presentation):
     if not assignments:
@@ -454,8 +473,9 @@ def assign_raw_inputs(context, values, assignments, definitions, interface_name,
         # Note: default value has already been assigned
 
         # Coerce value
-        values['inputs'][input_name] = coerce_property_value(context, assignment, definition,
-                                                             assignment.value)
+        values['inputs'][input_name] = coerce_parameter_value(context, assignment, definition,
+                                                              assignment.value)
+
 
 def validate_required_inputs(context, presentation, assignment, definition, original_assignment,
                              interface_name, operation_name=None):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/extensions/aria_extension_tosca/simple_v1_0/modeling/parameters.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/modeling/parameters.py b/extensions/aria_extension_tosca/simple_v1_0/modeling/parameters.py
new file mode 100644
index 0000000..c910956
--- /dev/null
+++ b/extensions/aria_extension_tosca/simple_v1_0/modeling/parameters.py
@@ -0,0 +1,211 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from aria.utils.collections import (merge, deepcopy_with_locators, OrderedDict)
+from aria.utils.formatting import pluralize
+from aria.parser.presentation import Value
+from aria.parser.validation import Issue
+
+from .data_types import coerce_value
+
+
+#
+# ArtifactType, DataType, CapabilityType, RelationshipType, NodeType, GroupType, PolicyType
+#
+
+def get_inherited_parameter_definitions(context, presentation, field_name, for_presentation=None):
+    """
+    Returns our parameter definitions added on top of those of our parent, if we have one
+    (recursively).
+
+    Allows overriding all aspects of parent properties except data type.
+    """
+
+    # Get definitions from parent
+    # If we inherit from a primitive, it does not have a parent:
+    parent = presentation._get_parent(context) if hasattr(presentation, '_get_parent') else None
+    definitions = get_inherited_parameter_definitions(context, parent, field_name,
+                                                      for_presentation=presentation) \
+                                                      if parent is not None else OrderedDict()
+
+    # Add/merge our definitions
+    # If we inherit from a primitive, it does not have our field
+    our_definitions = getattr(presentation, field_name, None)
+    if our_definitions:
+        our_definitions_clone = OrderedDict()
+        for name, our_definition in our_definitions.iteritems():
+            our_definitions_clone[name] = our_definition._clone(for_presentation)
+        our_definitions = our_definitions_clone
+        merge_parameter_definitions(context, presentation, definitions, our_definitions, field_name)
+
+    for definition in definitions.itervalues():
+        definition._reset_method_cache()
+
+    return definitions
+
+
+#
+# NodeTemplate, RelationshipTemplate, GroupTemplate, PolicyTemplate
+#
+
+def get_assigned_and_defined_parameter_values(context, presentation, field_name):
+    """
+    Returns the assigned property values while making sure they are defined in our type.
+
+    The property definition's default value, if available, will be used if we did not assign it.
+
+    Makes sure that required properties indeed end up with a value.
+    """
+
+    values = OrderedDict()
+
+    the_type = presentation._get_type(context)
+    field_name_plural = pluralize(field_name)
+    assignments = getattr(presentation, field_name_plural)
+    get_fn_name = '_get_{0}'.format(field_name_plural)
+    definitions = getattr(the_type, get_fn_name)(context) if the_type is not None else None
+
+    # Fill in our assignments, but make sure they are defined
+    if assignments:
+        for name, value in assignments.iteritems():
+            if (definitions is not None) and (name in definitions):
+                definition = definitions[name]
+                values[name] = coerce_parameter_value(context, value, definition, value.value)
+            else:
+                context.validation.report('assignment to undefined {0} "{1}" in "{2}"'
+                                          .format(field_name, name, presentation._fullname),
+                                          locator=value._locator, level=Issue.BETWEEN_TYPES)
+
+    # Fill in defaults from the definitions
+    if definitions:
+        for name, definition in definitions.iteritems():
+            if values.get(name) is None:
+                values[name] = coerce_parameter_value(context, presentation, definition,
+                                                      definition.default)
+
+    validate_required_values(context, presentation, values, definitions)
+
+    return values
+
+
+#
+# TopologyTemplate
+#
+
+def get_parameter_values(context, presentation, field_name):
+    values = OrderedDict()
+
+    parameters = getattr(presentation, field_name)
+
+    # Fill in defaults and values
+    if parameters:
+        for name, parameter in parameters.iteritems():
+            if values.get(name) is None:
+                if hasattr(parameter, 'value') and (parameter.value is not None):
+                    # For parameters only:
+                    values[name] = coerce_parameter_value(context, presentation, parameter,
+                                                          parameter.value)
+                else:
+                    default = parameter.default if hasattr(parameter, 'default') else None
+                    values[name] = coerce_parameter_value(context, presentation, parameter, default)
+
+    return values
+
+
+#
+# Utils
+#
+
+def validate_required_values(context, presentation, values, definitions):
+    """
+    Check if required properties have not been assigned.
+    """
+
+    if not definitions:
+        return
+    for name, definition in definitions.iteritems():
+        if getattr(definition, 'required', False) \
+            and ((values is None) or (values.get(name) is None)):
+            context.validation.report('required property "%s" is not assigned a value in "%s"'
+                                      % (name, presentation._fullname),
+                                      locator=presentation._get_child_locator('properties'),
+                                      level=Issue.BETWEEN_TYPES)
+
+
+def merge_raw_parameter_definition(context, presentation, raw_property_definition,
+                                   our_property_definition, field_name, property_name):
+    # Check if we changed the type
+    # TODO: allow a sub-type?
+    type1 = raw_property_definition.get('type')
+    type2 = our_property_definition.type
+    if type1 != type2:
+        context.validation.report(
+            'override changes type from "%s" to "%s" for property "%s" in "%s"'
+            % (type1, type2, property_name, presentation._fullname),
+            locator=presentation._get_child_locator(field_name, property_name),
+            level=Issue.BETWEEN_TYPES)
+
+    merge(raw_property_definition, our_property_definition._raw)
+
+
+def merge_raw_parameter_definitions(context, presentation, raw_property_definitions,
+                                    our_property_definitions, field_name):
+    if not our_property_definitions:
+        return
+    for property_name, our_property_definition in our_property_definitions.iteritems():
+        if property_name in raw_property_definitions:
+            raw_property_definition = raw_property_definitions[property_name]
+            merge_raw_parameter_definition(context, presentation, raw_property_definition,
+                                           our_property_definition, field_name, property_name)
+        else:
+            raw_property_definitions[property_name] = \
+                deepcopy_with_locators(our_property_definition._raw)
+
+
+def merge_parameter_definitions(context, presentation, property_definitions,
+                                our_property_definitions, field_name):
+    if not our_property_definitions:
+        return
+    for property_name, our_property_definition in our_property_definitions.iteritems():
+        if property_name in property_definitions:
+            property_definition = property_definitions[property_name]
+            merge_raw_parameter_definition(context, presentation, property_definition._raw,
+                                           our_property_definition, field_name, property_name)
+        else:
+            property_definitions[property_name] = our_property_definition
+
+
+# Works on properties, inputs, and parameters
+def coerce_parameter_value(context, presentation, definition, value, aspect=None):
+    the_type = definition._get_type(context) if definition is not None else None
+    entry_schema = definition.entry_schema if definition is not None else None
+    constraints = definition._get_constraints(context) \
+        if ((definition is not None) and hasattr(definition, '_get_constraints')) else None
+    value = coerce_value(context, presentation, the_type, entry_schema, constraints, value, aspect)
+    if (the_type is not None) and hasattr(the_type, '_name'):
+        type_name = the_type._name
+    else:
+        type_name = getattr(definition, 'type', None)
+    description = getattr(definition, 'description', None)
+    description = description.value if description is not None else None
+    return Value(type_name, value, description)
+
+
+def convert_parameter_definitions_to_values(context, definitions):
+    values = OrderedDict()
+    for name, definition in definitions.iteritems():
+        default = definition.default
+        values[name] = coerce_parameter_value(context, definition, definition, default)
+    return values



[3/4] incubator-ariatosca git commit: ARIA-149 Enhance operation configuration

Posted by em...@apache.org.
http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/extensions/aria_extension_tosca/simple_v1_0/modeling/policies.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/modeling/policies.py b/extensions/aria_extension_tosca/simple_v1_0/modeling/policies.py
index fba1972..7dd803b 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/policies.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/modeling/policies.py
@@ -15,6 +15,7 @@
 
 from ..presentation.types import convert_shorthand_to_full_type_name
 
+
 #
 # PolicyType
 #
@@ -49,6 +50,7 @@ def get_inherited_targets(context, presentation):
 
     return node_types, group_types
 
+
 #
 # PolicyTemplate
 #

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/extensions/aria_extension_tosca/simple_v1_0/modeling/properties.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/modeling/properties.py b/extensions/aria_extension_tosca/simple_v1_0/modeling/properties.py
deleted file mode 100644
index 9c3ea42..0000000
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/properties.py
+++ /dev/null
@@ -1,202 +0,0 @@
-# Licensed to the Apache Software Foundation (ASF) under one or more
-# contributor license agreements.  See the NOTICE file distributed with
-# this work for additional information regarding copyright ownership.
-# The ASF licenses this file to You under the Apache License, Version 2.0
-# (the "License"); you may not use this file except in compliance with
-# the License.  You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-from aria.utils.collections import merge, deepcopy_with_locators, OrderedDict
-from aria.parser.presentation import Value
-from aria.parser.validation import Issue
-
-from .data_types import coerce_value
-
-#
-# ArtifactType, DataType, CapabilityType, RelationshipType, NodeType, GroupType, PolicyType
-#
-
-# Works on properties, parameters, inputs, and attributes
-def get_inherited_property_definitions(context, presentation, field_name, for_presentation=None):
-    """
-    Returns our property definitions added on top of those of our parent, if we have one
-    (recursively).
-
-    Allows overriding all aspects of parent properties except data type.
-    """
-
-    # Get definitions from parent
-    # If we inherit from a primitive, it does not have a parent:
-    parent = presentation._get_parent(context) if hasattr(presentation, '_get_parent') else None
-    definitions = get_inherited_property_definitions(context, parent, field_name,
-                                                     for_presentation=presentation) \
-                                                     if parent is not None else OrderedDict()
-
-    # Add/merge our definitions
-    # If we inherit from a primitive, it does not have our field
-    our_definitions = getattr(presentation, field_name, None)
-    if our_definitions:
-        our_definitions_clone = OrderedDict()
-        for name, our_definition in our_definitions.iteritems():
-            our_definitions_clone[name] = our_definition._clone(for_presentation)
-        our_definitions = our_definitions_clone
-        merge_property_definitions(context, presentation, definitions, our_definitions, field_name)
-
-    for definition in definitions.itervalues():
-        definition._reset_method_cache()
-
-    return definitions
-
-#
-# NodeTemplate, RelationshipTemplate, GroupTemplate, PolicyTemplate
-#
-
-def get_assigned_and_defined_property_values(context, presentation, field_name='property',
-                                             field_name_plural='properties'):
-    """
-    Returns the assigned property values while making sure they are defined in our type.
-
-    The property definition's default value, if available, will be used if we did not assign it.
-
-    Makes sure that required properties indeed end up with a value.
-    """
-
-    values = OrderedDict()
-
-    the_type = presentation._get_type(context)
-    assignments = getattr(presentation, field_name_plural)
-    get_fn_name = '_get_{0}'.format(field_name_plural)
-    definitions = getattr(the_type, get_fn_name)(context) if the_type is not None else None
-
-    # Fill in our assignments, but make sure they are defined
-    if assignments:
-        for name, value in assignments.iteritems():
-            if (definitions is not None) and (name in definitions):
-                definition = definitions[name]
-                values[name] = coerce_property_value(context, value, definition, value.value)
-            else:
-                context.validation.report('assignment to undefined {0} "{1}" in "{2}"'
-                                          .format(field_name, name, presentation._fullname),
-                                          locator=value._locator, level=Issue.BETWEEN_TYPES)
-
-    # Fill in defaults from the definitions
-    if definitions:
-        for name, definition in definitions.iteritems():
-            if values.get(name) is None:
-                values[name] = coerce_property_value(context, presentation, definition,
-                                                     definition.default)
-
-    validate_required_values(context, presentation, values, definitions)
-
-    return values
-
-#
-# TopologyTemplate
-#
-
-def get_parameter_values(context, presentation, field_name):
-    values = OrderedDict()
-
-    parameters = getattr(presentation, field_name)
-
-    # Fill in defaults and values
-    if parameters:
-        for name, parameter in parameters.iteritems():
-            if values.get(name) is None:
-                if hasattr(parameter, 'value') and (parameter.value is not None):
-                    # For parameters only:
-                    values[name] = coerce_property_value(context, presentation, parameter,
-                                                         parameter.value)
-                else:
-                    default = parameter.default if hasattr(parameter, 'default') else None
-                    values[name] = coerce_property_value(context, presentation, parameter, default)
-
-    return values
-
-#
-# Utils
-#
-
-def validate_required_values(context, presentation, values, definitions):
-    """
-    Check if required properties have not been assigned.
-    """
-
-    if not definitions:
-        return
-    for name, definition in definitions.iteritems():
-        if getattr(definition, 'required', False) \
-            and ((values is None) or (values.get(name) is None)):
-            context.validation.report('required property "%s" is not assigned a value in "%s"'
-                                      % (name, presentation._fullname),
-                                      locator=presentation._get_child_locator('properties'),
-                                      level=Issue.BETWEEN_TYPES)
-
-def merge_raw_property_definition(context, presentation, raw_property_definition,
-                                  our_property_definition, field_name, property_name):
-    # Check if we changed the type
-    # TODO: allow a sub-type?
-    type1 = raw_property_definition.get('type')
-    type2 = our_property_definition.type
-    if type1 != type2:
-        context.validation.report(
-            'override changes type from "%s" to "%s" for property "%s" in "%s"'
-            % (type1, type2, property_name, presentation._fullname),
-            locator=presentation._get_child_locator(field_name, property_name),
-            level=Issue.BETWEEN_TYPES)
-
-    merge(raw_property_definition, our_property_definition._raw)
-
-def merge_raw_property_definitions(context, presentation, raw_property_definitions,
-                                   our_property_definitions, field_name):
-    if not our_property_definitions:
-        return
-    for property_name, our_property_definition in our_property_definitions.iteritems():
-        if property_name in raw_property_definitions:
-            raw_property_definition = raw_property_definitions[property_name]
-            merge_raw_property_definition(context, presentation, raw_property_definition,
-                                          our_property_definition, field_name, property_name)
-        else:
-            raw_property_definitions[property_name] = \
-                deepcopy_with_locators(our_property_definition._raw)
-
-def merge_property_definitions(context, presentation, property_definitions,
-                               our_property_definitions, field_name):
-    if not our_property_definitions:
-        return
-    for property_name, our_property_definition in our_property_definitions.iteritems():
-        if property_name in property_definitions:
-            property_definition = property_definitions[property_name]
-            merge_raw_property_definition(context, presentation, property_definition._raw,
-                                          our_property_definition, field_name, property_name)
-        else:
-            property_definitions[property_name] = our_property_definition
-
-# Works on properties, inputs, and parameters
-def coerce_property_value(context, presentation, definition, value, aspect=None):
-    the_type = definition._get_type(context) if definition is not None else None
-    entry_schema = definition.entry_schema if definition is not None else None
-    constraints = definition._get_constraints(context) \
-        if ((definition is not None) and hasattr(definition, '_get_constraints')) else None
-    value = coerce_value(context, presentation, the_type, entry_schema, constraints, value, aspect)
-    if (the_type is not None) and hasattr(the_type, '_name'):
-        type_name = the_type._name
-    else:
-        type_name = getattr(definition, 'type', None)
-    description = getattr(definition, 'description', None)
-    description = description.value if description is not None else None
-    return Value(type_name, value, description)
-
-def convert_property_definitions_to_values(context, definitions):
-    values = OrderedDict()
-    for name, definition in definitions.iteritems():
-        default = definition.default
-        values[name] = coerce_property_value(context, definition, definition, default)
-    return values

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/extensions/aria_extension_tosca/simple_v1_0/modeling/requirements.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/modeling/requirements.py b/extensions/aria_extension_tosca/simple_v1_0/modeling/requirements.py
index 2a68da2..6bdb5b1 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/requirements.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/modeling/requirements.py
@@ -14,13 +14,14 @@
 # limitations under the License.
 
 from aria.parser.validation import Issue
-from aria.utils.collections import deepcopy_with_locators, OrderedDict
+from aria.utils.collections import (deepcopy_with_locators, OrderedDict)
 
-from .properties import (convert_property_definitions_to_values, validate_required_values,
-                         coerce_property_value)
+from .parameters import (convert_parameter_definitions_to_values, validate_required_values,
+                         coerce_parameter_value)
 from .interfaces import (convert_requirement_interface_definitions_from_type_to_raw_template,
                          merge_interface_definitions, merge_interface, validate_required_inputs)
 
+
 #
 # NodeType
 #
@@ -49,6 +50,7 @@ def get_inherited_requirement_definitions(context, presentation):
 
     return requirement_definitions
 
+
 #
 # NodeTemplate
 #
@@ -127,6 +129,7 @@ def get_template_requirements(context, presentation):
 
     return requirement_assignments
 
+
 #
 # Utils
 #
@@ -195,8 +198,8 @@ def convert_requirement_from_definition_to_assignment(context, requirement_defin
             if relationship_property_definitions:
                 # Convert property definitions to values
                 raw['relationship']['properties'] = \
-                    convert_property_definitions_to_values(context,
-                                                           relationship_property_definitions)
+                    convert_parameter_definitions_to_values(context,
+                                                            relationship_property_definitions)
 
         # These are our interface definitions
         # InterfaceDefinition:
@@ -229,6 +232,7 @@ def convert_requirement_from_definition_to_assignment(context, requirement_defin
         relationship_property_definitions, \
         relationship_interface_definitions
 
+
 def add_requirement_assignments(context, presentation, requirement_assignments,
                                 requirement_definitions, our_requirement_assignments):
     for requirement_name, our_requirement_assignment in our_requirement_assignments:
@@ -258,6 +262,7 @@ def add_requirement_assignments(context, presentation, requirement_assignments,
                                       locator=our_requirement_assignment._locator,
                                       level=Issue.BETWEEN_TYPES)
 
+
 def merge_requirement_assignment(context, relationship_property_definitions,
                                  relationship_interface_definitions, requirement, our_requirement):
     our_capability = our_requirement.capability
@@ -283,6 +288,7 @@ def merge_requirement_assignment(context, relationship_property_definitions,
                                                   relationship_interface_definitions,
                                                   requirement, our_relationship)
 
+
 def merge_requirement_assignment_relationship(context, presentation, property_definitions,
                                               interface_definitions, requirement, our_relationship):
     our_relationship_properties = our_relationship._raw.get('properties')
@@ -296,7 +302,7 @@ def merge_requirement_assignment_relationship(context, presentation, property_de
             if property_name in property_definitions:
                 definition = property_definitions[property_name]
                 requirement._raw['relationship']['properties'][property_name] = \
-                    coerce_property_value(context, presentation, definition, prop)
+                    coerce_parameter_value(context, presentation, definition, prop)
             else:
                 context.validation.report(
                     'relationship property "%s" not declared at definition of requirement "%s"'
@@ -330,6 +336,7 @@ def merge_requirement_assignment_relationship(context, presentation, property_de
                        presentation._container._container._fullname),
                     locator=our_relationship._locator, level=Issue.BETWEEN_TYPES)
 
+
 def validate_requirement_assignment(context, presentation, requirement_assignment,
                                     relationship_property_definitions,
                                     relationship_interface_definitions):
@@ -348,6 +355,7 @@ def validate_requirement_assignment(context, presentation, requirement_assignmen
             validate_required_inputs(context, presentation, interface_assignment,
                                      relationship_interface_definition, None, interface_name)
 
+
 def get_first_requirement(requirement_definitions, name):
     if requirement_definitions is not None:
         for requirement_name, requirement_definition in requirement_definitions:

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/extensions/aria_extension_tosca/simple_v1_0/modeling/substitution_mappings.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/modeling/substitution_mappings.py b/extensions/aria_extension_tosca/simple_v1_0/modeling/substitution_mappings.py
index c1e21de..8f7ec4c 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/substitution_mappings.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/modeling/substitution_mappings.py
@@ -16,6 +16,7 @@
 from aria.utils.formatting import safe_repr
 from aria.parser.validation import Issue
 
+
 def validate_subtitution_mappings_requirement(context, presentation):
     if not validate_format(context, presentation, 'requirement'):
         return
@@ -57,6 +58,7 @@ def validate_subtitution_mappings_requirement(context, presentation):
             locator=presentation._locator, level=Issue.BETWEEN_TYPES)
         return
 
+
 def validate_subtitution_mappings_capability(context, presentation):
     if not validate_format(context, presentation, 'capability'):
         return
@@ -99,6 +101,7 @@ def validate_subtitution_mappings_capability(context, presentation):
             % (capability_type._name, presentation._name, type_capability_type._name),
             locator=presentation._locator, level=Issue.BETWEEN_TYPES)
 
+
 #
 # Utils
 #
@@ -114,6 +117,7 @@ def validate_format(context, presentation, name):
         return False
     return True
 
+
 def get_node_template(context, presentation, name):
     node_template_name = presentation._raw[0]
     node_template = context.presentation.get_from_dict('service_template', 'topology_template',

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/extensions/aria_extension_tosca/simple_v1_0/templates.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/templates.py b/extensions/aria_extension_tosca/simple_v1_0/templates.py
index ce6b5d9..123a00e 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/templates.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/templates.py
@@ -26,7 +26,7 @@ from .assignments import (PropertyAssignment, AttributeAssignment, RequirementAs
 from .definitions import ParameterDefinition
 from .filters import NodeFilter
 from .misc import (Description, MetaData, Repository, Import, SubstitutionMappings)
-from .modeling.properties import (get_assigned_and_defined_property_values, get_parameter_values)
+from .modeling.parameters import (get_assigned_and_defined_parameter_values, get_parameter_values)
 from .modeling.interfaces import get_template_interfaces
 from .modeling.requirements import get_template_requirements
 from .modeling.capabilities import get_template_capabilities
@@ -157,12 +157,11 @@ class NodeTemplate(ExtensiblePresentation):
 
     @cachedmethod
     def _get_property_values(self, context):
-        return FrozenDict(get_assigned_and_defined_property_values(context, self))
+        return FrozenDict(get_assigned_and_defined_parameter_values(context, self, 'property'))
 
     @cachedmethod
     def _get_attribute_default_values(self, context):
-        return FrozenDict(get_assigned_and_defined_property_values(context, self,
-                                                                   'attribute', 'attributes'))
+        return FrozenDict(get_assigned_and_defined_parameter_values(context, self, 'attribute'))
 
     @cachedmethod
     def _get_requirements(self, context):
@@ -281,7 +280,7 @@ class RelationshipTemplate(ExtensiblePresentation):
 
     @cachedmethod
     def _get_property_values(self, context):
-        return FrozenDict(get_assigned_and_defined_property_values(context, self))
+        return FrozenDict(get_assigned_and_defined_parameter_values(context, self, 'property'))
 
     @cachedmethod
     def _get_interfaces(self, context):
@@ -363,7 +362,7 @@ class GroupTemplate(ExtensiblePresentation):
 
     @cachedmethod
     def _get_property_values(self, context):
-        return FrozenDict(get_assigned_and_defined_property_values(context, self))
+        return FrozenDict(get_assigned_and_defined_parameter_values(context, self, 'property'))
 
     @cachedmethod
     def _get_interfaces(self, context):
@@ -427,7 +426,7 @@ class PolicyTemplate(ExtensiblePresentation):
 
     @cachedmethod
     def _get_property_values(self, context):
-        return FrozenDict(get_assigned_and_defined_property_values(context, self))
+        return FrozenDict(get_assigned_and_defined_parameter_values(context, self, 'property'))
 
     @cachedmethod
     def _get_targets(self, context):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/extensions/aria_extension_tosca/simple_v1_0/types.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/types.py b/extensions/aria_extension_tosca/simple_v1_0/types.py
index bc80eb9..d97b89c 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/types.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/types.py
@@ -33,9 +33,9 @@ from .modeling.capabilities import (get_inherited_valid_source_types,
                                     get_inherited_capability_definitions)
 from .modeling.data_types import (get_data_type, get_inherited_constraints, coerce_data_type_value,
                                   validate_data_type_name)
-from .modeling.interfaces import get_inherited_interface_definitions, get_inherited_operations
+from .modeling.interfaces import (get_inherited_interface_definitions, get_inherited_operations)
 from .modeling.policies import get_inherited_targets
-from .modeling.properties import get_inherited_property_definitions
+from .modeling.parameters import get_inherited_parameter_definitions
 from .modeling.requirements import get_inherited_requirement_definitions
 from .presentation.extensible import ExtensiblePresentation
 from .presentation.field_getters import data_type_class_getter
@@ -115,7 +115,7 @@ class ArtifactType(ExtensiblePresentation):
 
     @cachedmethod
     def _get_properties(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 'properties'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 'properties'))
 
     def _validate(self, context):
         super(ArtifactType, self)._validate(context)
@@ -201,7 +201,7 @@ class DataType(ExtensiblePresentation):
 
     @cachedmethod
     def _get_properties(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 'properties'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 'properties'))
 
     @cachedmethod
     def _get_constraints(self, context):
@@ -307,7 +307,7 @@ class CapabilityType(ExtensiblePresentation):
 
     @cachedmethod
     def _get_properties(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 'properties'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 'properties'))
 
     @cachedmethod
     def _get_valid_source_types(self, context):
@@ -385,7 +385,7 @@ class InterfaceType(ExtensiblePresentation):
 
     @cachedmethod
     def _get_inputs(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 'inputs'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 'inputs'))
 
     @cachedmethod
     def _get_operations(self, context):
@@ -493,11 +493,11 @@ class RelationshipType(ExtensiblePresentation):
 
     @cachedmethod
     def _get_properties(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 'properties'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 'properties'))
 
     @cachedmethod
     def _get_attributes(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 'attributes'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 'attributes'))
 
     @cachedmethod
     def _get_interfaces(self, context):
@@ -624,11 +624,11 @@ class NodeType(ExtensiblePresentation):
 
     @cachedmethod
     def _get_properties(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 'properties'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 'properties'))
 
     @cachedmethod
     def _get_attributes(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 'attributes'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 'attributes'))
 
     @cachedmethod
     def _get_requirements(self, context):
@@ -760,7 +760,7 @@ class GroupType(ExtensiblePresentation):
 
     @cachedmethod
     def _get_properties(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 'properties'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 'properties'))
 
     @cachedmethod
     def _get_interfaces(self, context):
@@ -848,7 +848,7 @@ class PolicyType(ExtensiblePresentation):
 
     @cachedmethod
     def _get_properties(self, context):
-        return FrozenDict(get_inherited_property_definitions(context, self, 'properties'))
+        return FrozenDict(get_inherited_parameter_definitions(context, self, 'properties'))
 
     @cachedmethod
     def _get_targets(self, context):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/cli/test_services.py
----------------------------------------------------------------------
diff --git a/tests/cli/test_services.py b/tests/cli/test_services.py
index b1a6ee4..e5717cc 100644
--- a/tests/cli/test_services.py
+++ b/tests/cli/test_services.py
@@ -19,7 +19,7 @@ import mock
 from aria.cli.env import _Environment
 from aria.core import Core
 from aria.exceptions import DependentActiveExecutionsError, DependentAvailableNodesError
-from aria.modeling.exceptions import InputsException
+from aria.modeling.exceptions import ParameterException
 from aria.storage import exceptions as storage_exceptions
 
 from .base_test import (  # pylint: disable=unused-import
@@ -120,11 +120,11 @@ class TestServicesCreate(TestCliBase):
         monkeypatch.setattr(_Environment, 'model_storage', mock_storage)
         monkeypatch.setattr(Core,
                             'create_service',
-                            raise_exception(InputsException))
+                            raise_exception(ParameterException))
 
         assert_exception_raised(
             self.invoke('services create -t with_inputs test_s'),
-            expected_exception=InputsException)
+            expected_exception=ParameterException)
 
         assert "Service created. The service's name is test_s" not in self.logger_output_string
 
@@ -152,8 +152,8 @@ class TestServicesDelete(TestCliBase):
         assert_exception_raised(
             self.invoke('services delete test_s'),
             expected_exception=DependentActiveExecutionsError,
-            expected_msg="Can't delete service {name} - there is an active execution "
-                         "for this service. Active execution id: 1".format(
+            expected_msg="Can't delete service `{name}` - there is an active execution "
+                         "for this service. Active execution ID: 1".format(
                              name=mock_models.SERVICE_NAME))
 
     def test_delete_available_nodes_error(self, monkeypatch, mock_storage):
@@ -161,8 +161,8 @@ class TestServicesDelete(TestCliBase):
         assert_exception_raised(
             self.invoke('services delete test_s'),
             expected_exception=DependentAvailableNodesError,
-            expected_msg="Can't delete service {name} - there are available nodes "
-                         "for this service. Available node ids: 1".format(
+            expected_msg="Can't delete service `{name}` - there are available nodes "
+                         "for this service. Available node IDs: 1".format(
                              name=mock_models.SERVICE_NAME))
 
     def test_delete_available_nodes_error_with_force(self, monkeypatch, mock_storage):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/mock/models.py
----------------------------------------------------------------------
diff --git a/tests/mock/models.py b/tests/mock/models.py
index f066551..a5030f5 100644
--- a/tests/mock/models.py
+++ b/tests/mock/models.py
@@ -228,11 +228,11 @@ def create_interface(service, interface_name, operation_name, operation_kwargs=N
                      interface_kwargs=None):
     the_type = service.service_template.interface_types.get_descendant('test_interface_type')
 
-    if operation_kwargs and operation_kwargs.get('inputs'):
-        operation_kwargs['inputs'] = dict(
-            (input_name, models.Parameter.wrap(input_name, input_value))
-            for input_name, input_value in operation_kwargs['inputs'].iteritems()
-            if input_value is not None)
+    if operation_kwargs and operation_kwargs.get('arguments'):
+        operation_kwargs['arguments'] = dict(
+            (argument_name, models.Parameter.wrap(argument_name, argument_value))
+            for argument_name, argument_value in operation_kwargs['arguments'].iteritems()
+            if argument_value is not None)
 
     operation = models.Operation(
         name=operation_name,

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/mock/topology.py
----------------------------------------------------------------------
diff --git a/tests/mock/topology.py b/tests/mock/topology.py
index bfb7b4e..ab08dbd 100644
--- a/tests/mock/topology.py
+++ b/tests/mock/topology.py
@@ -27,9 +27,9 @@ def create_simple_topology_single_node(model_storage, create_operation):
         service_template,
         'Standard', 'create',
         operation_kwargs=dict(
-            implementation=create_operation,
-            inputs={'key': aria_models.Parameter.wrap('key', 'create'),
-                    'value': aria_models.Parameter.wrap('value', True)})
+            function=create_operation,
+            arguments={'key': aria_models.Parameter.wrap('key', 'create'),
+                       'value': aria_models.Parameter.wrap('value', True)})
     )
     node_template.interface_templates[interface_template.name] = interface_template                 # pylint: disable=unsubscriptable-object
 
@@ -38,9 +38,9 @@ def create_simple_topology_single_node(model_storage, create_operation):
         service,
         'Standard', 'create',
         operation_kwargs=dict(
-            implementation=create_operation,
-            inputs={'key': aria_models.Parameter.wrap('key', 'create'),
-                    'value': aria_models.Parameter.wrap('value', True)})
+            function=create_operation,
+            arguments={'key': aria_models.Parameter.wrap('key', 'create'),
+                       'value': aria_models.Parameter.wrap('value', True)})
     )
     node.interfaces[interface.name] = interface                                                     # pylint: disable=unsubscriptable-object
 

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/orchestrator/context/test_operation.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/context/test_operation.py b/tests/orchestrator/context/test_operation.py
index cdeb5fa..81aa2a2 100644
--- a/tests/orchestrator/context/test_operation.py
+++ b/tests/orchestrator/context/test_operation.py
@@ -78,14 +78,14 @@ def test_node_operation_task_execution(ctx, thread_executor, dataholder):
     interface_name = 'Standard'
     operation_name = 'create'
 
-    inputs = {'putput': True, 'holder_path': dataholder.path}
+    arguments = {'putput': True, 'holder_path': dataholder.path}
     node = ctx.model.node.get_by_name(mock.models.DEPENDENCY_NODE_NAME)
     interface = mock.models.create_interface(
         node.service,
         interface_name,
         operation_name,
-        operation_kwargs=dict(implementation=op_path(basic_node_operation, module_path=__name__),
-                              inputs=inputs)
+        operation_kwargs=dict(function=op_path(basic_node_operation, module_path=__name__),
+                              arguments=arguments)
     )
     node.interfaces[interface.name] = interface
     ctx.model.node.update(node)
@@ -97,7 +97,7 @@ def test_node_operation_task_execution(ctx, thread_executor, dataholder):
                 node,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs
+                inputs=arguments
             )
         )
 
@@ -115,7 +115,7 @@ def test_node_operation_task_execution(ctx, thread_executor, dataholder):
     )
     operations = interface.operations
     assert len(operations) == 1
-    assert dataholder['implementation'] == operations.values()[0].implementation             # pylint: disable=no-member
+    assert dataholder['implementation'] == operations.values()[0].function             # pylint: disable=no-member
     assert dataholder['inputs']['putput'] is True
 
     # Context based attributes (sugaring)
@@ -127,15 +127,14 @@ def test_relationship_operation_task_execution(ctx, thread_executor, dataholder)
     interface_name = 'Configure'
     operation_name = 'post_configure'
 
-    inputs = {'putput': True, 'holder_path': dataholder.path}
+    arguments = {'putput': True, 'holder_path': dataholder.path}
     relationship = ctx.model.relationship.list()[0]
     interface = mock.models.create_interface(
         relationship.source_node.service,
         interface_name,
         operation_name,
-        operation_kwargs=dict(implementation=op_path(basic_relationship_operation,
-                                                     module_path=__name__),
-                              inputs=inputs),
+        operation_kwargs=dict(function=op_path(basic_relationship_operation, module_path=__name__),
+                              arguments=arguments),
     )
 
     relationship.interfaces[interface.name] = interface
@@ -148,7 +147,7 @@ def test_relationship_operation_task_execution(ctx, thread_executor, dataholder)
                 relationship,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs
+                inputs=arguments
             )
         )
 
@@ -160,7 +159,7 @@ def test_relationship_operation_task_execution(ctx, thread_executor, dataholder)
     assert dataholder['actor_name'] == relationship.name
     assert interface_name in dataholder['task_name']
     operations = interface.operations
-    assert dataholder['implementation'] == operations.values()[0].implementation           # pylint: disable=no-member
+    assert dataholder['implementation'] == operations.values()[0].function           # pylint: disable=no-member
     assert dataholder['inputs']['putput'] is True
 
     # Context based attributes (sugaring)
@@ -197,8 +196,8 @@ def test_invalid_task_operation_id(ctx, thread_executor, dataholder):
         node.service,
         interface_name=interface_name,
         operation_name=operation_name,
-        operation_kwargs=dict(implementation=op_path(get_node_id, module_path=__name__),
-                              inputs={'holder_path': dataholder.path})
+        operation_kwargs=dict(function=op_path(get_node_id, module_path=__name__),
+                              arguments={'holder_path': dataholder.path})
     )
     node.interfaces[interface.name] = interface
     ctx.model.node.update(node)
@@ -234,15 +233,15 @@ def test_plugin_workdir(ctx, thread_executor, tmpdir):
     node = ctx.model.node.get_by_name(mock.models.DEPENDENCY_NODE_NAME)
     filename = 'test_file'
     content = 'file content'
-    inputs = {'filename': filename, 'content': content}
+    arguments = {'filename': filename, 'content': content}
     interface = mock.models.create_interface(
         node.service,
         interface_name,
         operation_name,
         operation_kwargs=dict(
-            implementation='{0}.{1}'.format(__name__, _test_plugin_workdir.__name__),
+            function='{0}.{1}'.format(__name__, _test_plugin_workdir.__name__),
             plugin=plugin,
-            inputs=inputs)
+            arguments=arguments)
     )
     node.interfaces[interface.name] = interface
     ctx.model.node.update(node)
@@ -253,7 +252,7 @@ def test_plugin_workdir(ctx, thread_executor, tmpdir):
             node,
             interface_name=interface_name,
             operation_name=operation_name,
-            inputs=inputs))
+            inputs=arguments))
 
     execute(workflow_func=basic_workflow, workflow_context=ctx, executor=thread_executor)
     expected_file = tmpdir.join('workdir', 'plugins', str(ctx.service.id),
@@ -280,7 +279,7 @@ def test_node_operation_logging(ctx, executor):
 
     node = ctx.model.node.get_by_name(mock.models.DEPENDENCY_NODE_NAME)
 
-    inputs = {
+    arguments = {
         'op_start': 'op_start',
         'op_end': 'op_end',
     }
@@ -289,8 +288,8 @@ def test_node_operation_logging(ctx, executor):
         interface_name,
         operation_name,
         operation_kwargs=dict(
-            implementation=op_path(logged_operation, module_path=__name__),
-            inputs=inputs)
+            function=op_path(logged_operation, module_path=__name__),
+            arguments=arguments)
     )
     node.interfaces[interface.name] = interface
     ctx.model.node.update(node)
@@ -302,19 +301,19 @@ def test_node_operation_logging(ctx, executor):
                 node,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs
+                inputs=arguments
             )
         )
 
     execute(workflow_func=basic_workflow, workflow_context=ctx, executor=executor)
-    _assert_loggins(ctx, inputs)
+    _assert_loggins(ctx, arguments)
 
 
 def test_relationship_operation_logging(ctx, executor):
     interface_name, operation_name = mock.operations.RELATIONSHIP_OPERATIONS_INSTALL[0]
 
     relationship = ctx.model.relationship.list()[0]
-    inputs = {
+    arguments = {
         'op_start': 'op_start',
         'op_end': 'op_end',
     }
@@ -322,8 +321,8 @@ def test_relationship_operation_logging(ctx, executor):
         relationship.source_node.service,
         interface_name,
         operation_name,
-        operation_kwargs=dict(implementation=op_path(logged_operation, module_path=__name__),
-                              inputs=inputs)
+        operation_kwargs=dict(function=op_path(logged_operation, module_path=__name__),
+                              arguments=arguments)
     )
     relationship.interfaces[interface.name] = interface
     ctx.model.relationship.update(relationship)
@@ -335,12 +334,12 @@ def test_relationship_operation_logging(ctx, executor):
                 relationship,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs
+                inputs=arguments
             )
         )
 
     execute(workflow_func=basic_workflow, workflow_context=ctx, executor=executor)
-    _assert_loggins(ctx, inputs)
+    _assert_loggins(ctx, arguments)
 
 
 def _assert_loggins(ctx, inputs):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/orchestrator/context/test_serialize.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/context/test_serialize.py b/tests/orchestrator/context/test_serialize.py
index 8a5db6f..946b0bd 100644
--- a/tests/orchestrator/context/test_serialize.py
+++ b/tests/orchestrator/context/test_serialize.py
@@ -47,7 +47,7 @@ def _mock_workflow(ctx, graph):
         node.service,
         'test',
         'op',
-        operation_kwargs=dict(implementation=_operation_mapping(),
+        operation_kwargs=dict(function=_operation_mapping(),
                               plugin=plugin)
     )
     node.interfaces[interface.name] = interface

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/orchestrator/context/test_toolbelt.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/context/test_toolbelt.py b/tests/orchestrator/context/test_toolbelt.py
index d199954..f4d0c06 100644
--- a/tests/orchestrator/context/test_toolbelt.py
+++ b/tests/orchestrator/context/test_toolbelt.py
@@ -85,12 +85,12 @@ def test_host_ip(workflow_context, executor, dataholder):
     interface_name = 'Standard'
     operation_name = 'create'
     _, dependency_node, _, _, _ = _get_elements(workflow_context)
-    inputs = {'putput': True, 'holder_path': dataholder.path}
+    arguments = {'putput': True, 'holder_path': dataholder.path}
     interface = mock.models.create_interface(
         dependency_node.service,
         interface_name=interface_name,
         operation_name=operation_name,
-        operation_kwargs=dict(implementation=op_path(host_ip, module_path=__name__), inputs=inputs)
+        operation_kwargs=dict(function=op_path(host_ip, module_path=__name__), arguments=arguments)
     )
     dependency_node.interfaces[interface.name] = interface
     dependency_node.runtime_properties['ip'] = '1.1.1.1'
@@ -104,7 +104,7 @@ def test_host_ip(workflow_context, executor, dataholder):
                 dependency_node,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs
+                inputs=arguments
             )
         )
 
@@ -117,13 +117,13 @@ def test_relationship_tool_belt(workflow_context, executor, dataholder):
     interface_name = 'Configure'
     operation_name = 'post_configure'
     _, _, _, _, relationship = _get_elements(workflow_context)
-    inputs = {'putput': True, 'holder_path': dataholder.path}
+    arguments = {'putput': True, 'holder_path': dataholder.path}
     interface = mock.models.create_interface(
         relationship.source_node.service,
         interface_name=interface_name,
         operation_name=operation_name,
-        operation_kwargs=dict(implementation=op_path(relationship_operation, module_path=__name__),
-                              inputs=inputs)
+        operation_kwargs=dict(function=op_path(relationship_operation, module_path=__name__),
+                              arguments=arguments)
     )
     relationship.interfaces[interface.name] = interface
     workflow_context.model.relationship.update(relationship)
@@ -135,7 +135,7 @@ def test_relationship_tool_belt(workflow_context, executor, dataholder):
                 relationship,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs
+                inputs=arguments
             )
         )
 

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/orchestrator/execution_plugin/test_local.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/execution_plugin/test_local.py b/tests/orchestrator/execution_plugin/test_local.py
index 09d0499..e7b2b03 100644
--- a/tests/orchestrator/execution_plugin/test_local.py
+++ b/tests/orchestrator/execution_plugin/test_local.py
@@ -461,7 +461,7 @@ if __name__ == '__main__':
              inputs=None):
         local_script_path = script_path
         script_path = os.path.basename(local_script_path) if local_script_path else ''
-        inputs = inputs or {}
+        arguments = inputs or {}
         process = process or {}
         if script_path:
             workflow_context.resource.service.upload(
@@ -469,7 +469,7 @@ if __name__ == '__main__':
                 source=local_script_path,
                 path=script_path)
 
-        inputs.update({
+        arguments.update({
             'script_path': script_path,
             'process': process,
             'input_as_env_var': env_var
@@ -483,17 +483,17 @@ if __name__ == '__main__':
                 'test',
                 'op',
                 operation_kwargs=dict(
-                    implementation='{0}.{1}'.format(
+                    function='{0}.{1}'.format(
                         operations.__name__,
                         operations.run_script_locally.__name__),
-                    inputs=inputs)
+                    arguments=arguments)
             )
             node.interfaces[interface.name] = interface
             graph.add_tasks(api.task.OperationTask(
                 node,
                 interface_name='test',
                 operation_name='op',
-                inputs=inputs))
+                inputs=arguments))
             return graph
         tasks_graph = mock_workflow(ctx=workflow_context)  # pylint: disable=no-value-for-parameter
         eng = engine.Engine(

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/orchestrator/execution_plugin/test_ssh.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/execution_plugin/test_ssh.py b/tests/orchestrator/execution_plugin/test_ssh.py
index a9dc5e8..7a2787b 100644
--- a/tests/orchestrator/execution_plugin/test_ssh.py
+++ b/tests/orchestrator/execution_plugin/test_ssh.py
@@ -217,7 +217,7 @@ class TestWithActualSSHServer(object):
         @workflow
         def mock_workflow(ctx, graph):
             node = ctx.model.node.get_by_name(mock.models.DEPENDENCY_NODE_NAME)
-            inputs = {
+            arguments = {
                 'script_path': script_path,
                 'fabric_env': _FABRIC_ENV,
                 'process': process,
@@ -226,24 +226,24 @@ class TestWithActualSSHServer(object):
                 'test_operation': '',
             }
             if hide_output:
-                inputs['hide_output'] = hide_output
+                arguments['hide_output'] = hide_output
             if commands:
-                inputs['commands'] = commands
+                arguments['commands'] = commands
             interface = mock.models.create_interface(
                 node.service,
                 'test',
                 'op',
                 operation_kwargs=dict(
-                    implementation='{0}.{1}'.format(
+                    function='{0}.{1}'.format(
                         operations.__name__,
                         operation.__name__),
-                    inputs=inputs)
+                    arguments=arguments)
             )
             node.interfaces[interface.name] = interface
 
             ops = []
             for test_operation in test_operations:
-                op_inputs = inputs.copy()
+                op_inputs = arguments.copy()
                 op_inputs['test_operation'] = test_operation
                 ops.append(api.task.OperationTask(
                     node,

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/orchestrator/test_workflow_runner.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/test_workflow_runner.py b/tests/orchestrator/test_workflow_runner.py
index 7374e50..405cb80 100644
--- a/tests/orchestrator/test_workflow_runner.py
+++ b/tests/orchestrator/test_workflow_runner.py
@@ -190,7 +190,7 @@ def test_execution_inputs_override_workflow_inputs(request):
 def test_execution_inputs_undeclared_inputs(request):
     mock_workflow = _setup_mock_workflow_in_service(request)
 
-    with pytest.raises(modeling_exceptions.UndeclaredInputsException):
+    with pytest.raises(modeling_exceptions.UndeclaredParametersException):
         _create_workflow_runner(request, mock_workflow, inputs={'undeclared_input': 'value'})
 
 
@@ -198,7 +198,7 @@ def test_execution_inputs_missing_required_inputs(request):
     mock_workflow = _setup_mock_workflow_in_service(
         request, inputs={'required_input': models.Parameter.wrap('required_input', value=None)})
 
-    with pytest.raises(modeling_exceptions.MissingRequiredInputsException):
+    with pytest.raises(modeling_exceptions.MissingRequiredParametersException):
         _create_workflow_runner(request, mock_workflow, inputs={})
 
 
@@ -206,13 +206,13 @@ def test_execution_inputs_wrong_type_inputs(request):
     mock_workflow = _setup_mock_workflow_in_service(
         request, inputs={'input': models.Parameter.wrap('input', 'value')})
 
-    with pytest.raises(modeling_exceptions.InputsOfWrongTypeException):
+    with pytest.raises(modeling_exceptions.ParametersOfWrongTypeException):
         _create_workflow_runner(request, mock_workflow, inputs={'input': 5})
 
 
 def test_execution_inputs_builtin_workflow_with_inputs(request):
     # built-in workflows don't have inputs
-    with pytest.raises(modeling_exceptions.UndeclaredInputsException):
+    with pytest.raises(modeling_exceptions.UndeclaredParametersException):
         _create_workflow_runner(request, 'install', inputs={'undeclared_input': 'value'})
 
 

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/orchestrator/workflows/api/test_task.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/workflows/api/test_task.py b/tests/orchestrator/workflows/api/test_task.py
index 642c785..d57e424 100644
--- a/tests/orchestrator/workflows/api/test_task.py
+++ b/tests/orchestrator/workflows/api/test_task.py
@@ -44,15 +44,15 @@ class TestOperationTask(object):
         plugin = mock.models.create_plugin('test_plugin', '0.1')
         ctx.model.node.update(plugin)
 
-        inputs = {'test_input': True}
+        arguments = {'test_input': True}
 
         interface = mock.models.create_interface(
             ctx.service,
             interface_name,
             operation_name,
             operation_kwargs=dict(plugin=plugin,
-                                  implementation='op_path',
-                                  inputs=inputs),)
+                                  function='op_path',
+                                  arguments=arguments),)
 
         node = ctx.model.node.get_by_name(mock.models.DEPENDENT_NODE_NAME)
         node.interfaces[interface_name] = interface
@@ -66,7 +66,7 @@ class TestOperationTask(object):
                 node,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs,
+                inputs=arguments,
                 max_attempts=max_attempts,
                 retry_interval=retry_interval,
                 ignore_failure=ignore_failure)
@@ -92,15 +92,15 @@ class TestOperationTask(object):
         plugin = mock.models.create_plugin('test_plugin', '0.1')
         ctx.model.plugin.update(plugin)
 
-        inputs = {'test_input': True}
+        arguments = {'test_input': True}
 
         interface = mock.models.create_interface(
             ctx.service,
             interface_name,
             operation_name,
             operation_kwargs=dict(plugin=plugin,
-                                  implementation='op_path',
-                                  inputs=inputs)
+                                  function='op_path',
+                                  arguments=arguments)
         )
 
         relationship = ctx.model.relationship.list()[0]
@@ -113,7 +113,7 @@ class TestOperationTask(object):
                 relationship,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs,
+                inputs=arguments,
                 max_attempts=max_attempts,
                 retry_interval=retry_interval)
 
@@ -137,15 +137,15 @@ class TestOperationTask(object):
         plugin = mock.models.create_plugin('test_plugin', '0.1')
         ctx.model.node.update(plugin)
 
-        inputs = {'test_input': True}
+        arguments = {'test_input': True}
 
         interface = mock.models.create_interface(
             ctx.service,
             interface_name,
             operation_name,
             operation_kwargs=dict(plugin=plugin,
-                                  implementation='op_path',
-                                  inputs=inputs)
+                                  function='op_path',
+                                  arguments=arguments)
         )
 
         relationship = ctx.model.relationship.list()[0]
@@ -158,7 +158,7 @@ class TestOperationTask(object):
                 relationship,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs,
+                inputs=arguments,
                 max_attempts=max_attempts,
                 retry_interval=retry_interval)
 
@@ -189,7 +189,7 @@ class TestOperationTask(object):
             interface_name,
             operation_name,
             operation_kwargs=dict(plugin=plugin,
-                                  implementation='op_path'))
+                                  function='op_path'))
         dependency_node.interfaces[interface_name] = interface
 
         with context.workflow.current.push(ctx):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/orchestrator/workflows/builtin/test_execute_operation.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/workflows/builtin/test_execute_operation.py b/tests/orchestrator/workflows/builtin/test_execute_operation.py
index 4cddbe6..88818ca 100644
--- a/tests/orchestrator/workflows/builtin/test_execute_operation.py
+++ b/tests/orchestrator/workflows/builtin/test_execute_operation.py
@@ -35,7 +35,7 @@ def test_execute_operation(ctx):
         ctx.service,
         interface_name,
         operation_name,
-        operation_kwargs={'implementation': 'test'}
+        operation_kwargs=dict(function='test')
     )
     node.interfaces[interface.name] = interface
     ctx.model.node.update(node)

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/orchestrator/workflows/core/test_engine.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/workflows/core/test_engine.py b/tests/orchestrator/workflows/core/test_engine.py
index 8c0705b..43ec9f1 100644
--- a/tests/orchestrator/workflows/core/test_engine.py
+++ b/tests/orchestrator/workflows/core/test_engine.py
@@ -63,11 +63,11 @@ class BaseTest(object):
             ignore_failure=None):
         node = ctx.model.node.get_by_name(mock.models.DEPENDENCY_NODE_NAME)
         interface_name = 'aria.interfaces.lifecycle'
-        operation_kwargs = dict(implementation='{name}.{func.__name__}'.format(
+        operation_kwargs = dict(function='{name}.{func.__name__}'.format(
             name=__name__, func=func))
         if inputs:
-            # the operation has to declare the inputs before those may be passed
-            operation_kwargs['inputs'] = inputs
+            # the operation has to declare the arguments before those may be passed
+            operation_kwargs['arguments'] = inputs
         operation_name = 'create'
         interface = mock.models.create_interface(node.service, interface_name, operation_name,
                                                  operation_kwargs=operation_kwargs)

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/orchestrator/workflows/core/test_events.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/workflows/core/test_events.py b/tests/orchestrator/workflows/core/test_events.py
index 184071d..6d542e9 100644
--- a/tests/orchestrator/workflows/core/test_events.py
+++ b/tests/orchestrator/workflows/core/test_events.py
@@ -110,8 +110,7 @@ def run_operation_on_node(ctx, op_name, interface_name):
         service=node.service,
         interface_name=interface_name,
         operation_name=op_name,
-        operation_kwargs=dict(implementation='{name}.{func.__name__}'.format(name=__name__,
-                                                                             func=func)))
+        operation_kwargs=dict(function='{name}.{func.__name__}'.format(name=__name__, func=func)))
     node.interfaces[interface.name] = interface
 
     eng = engine.Engine(executor=ThreadExecutor(),

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/orchestrator/workflows/core/test_task.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/workflows/core/test_task.py b/tests/orchestrator/workflows/core/test_task.py
index 50ca7f5..1d0a473 100644
--- a/tests/orchestrator/workflows/core/test_task.py
+++ b/tests/orchestrator/workflows/core/test_task.py
@@ -43,7 +43,7 @@ def ctx(tmpdir):
         relationship.source_node.service,
         RELATIONSHIP_INTERFACE_NAME,
         RELATIONSHIP_OPERATION_NAME,
-        operation_kwargs={'implementation': 'test'}
+        operation_kwargs=dict(function='test')
     )
     relationship.interfaces[interface.name] = interface
     context.model.relationship.update(relationship)
@@ -53,7 +53,7 @@ def ctx(tmpdir):
         node.service,
         NODE_INTERFACE_NAME,
         NODE_OPERATION_NAME,
-        operation_kwargs={'implementation': 'test'}
+        operation_kwargs=dict(function='test')
     )
     node.interfaces[interface.name] = interface
     context.model.node.update(node)
@@ -92,7 +92,7 @@ class TestOperationTask(object):
             node.service,
             NODE_INTERFACE_NAME,
             NODE_OPERATION_NAME,
-            operation_kwargs=dict(plugin=storage_plugin, implementation='test')
+            operation_kwargs=dict(plugin=storage_plugin, function='test')
         )
         node.interfaces[interface.name] = interface
         ctx.model.node.update(node)

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/orchestrator/workflows/core/test_task_graph_into_execution_graph.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/workflows/core/test_task_graph_into_execution_graph.py b/tests/orchestrator/workflows/core/test_task_graph_into_execution_graph.py
index 2a96d01..1633d4a 100644
--- a/tests/orchestrator/workflows/core/test_task_graph_into_execution_graph.py
+++ b/tests/orchestrator/workflows/core/test_task_graph_into_execution_graph.py
@@ -32,7 +32,7 @@ def test_task_graph_into_execution_graph(tmpdir):
         node.service,
         interface_name,
         operation_name,
-        operation_kwargs={'implementation': 'test'}
+        operation_kwargs=dict(function='test')
     )
     node.interfaces[interface.name] = interface
     task_context.model.node.update(node)

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/orchestrator/workflows/executor/test_process_executor_concurrent_modifications.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/workflows/executor/test_process_executor_concurrent_modifications.py b/tests/orchestrator/workflows/executor/test_process_executor_concurrent_modifications.py
index 1dbfae1..6060620 100644
--- a/tests/orchestrator/workflows/executor/test_process_executor_concurrent_modifications.py
+++ b/tests/orchestrator/workflows/executor/test_process_executor_concurrent_modifications.py
@@ -78,7 +78,7 @@ def _test(context, executor, lock_files, func, expected_failure):
     key = 'key'
     first_value = 'value1'
     second_value = 'value2'
-    inputs = {
+    arguments = {
         'lock_files': lock_files,
         'key': key,
         'first_value': first_value,
@@ -90,8 +90,8 @@ def _test(context, executor, lock_files, func, expected_failure):
         node.service,
         interface_name,
         operation_name,
-        operation_kwargs=dict(implementation='{0}.{1}'.format(__name__, func.__name__),
-                              inputs=inputs)
+        operation_kwargs=dict(function='{0}.{1}'.format(__name__, func.__name__),
+                              arguments=arguments)
     )
     node.interfaces[interface.name] = interface
     context.model.node.update(node)
@@ -103,12 +103,12 @@ def _test(context, executor, lock_files, func, expected_failure):
                 node,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs),
+                inputs=arguments),
             api.task.OperationTask(
                 node,
                 interface_name=interface_name,
                 operation_name=operation_name,
-                inputs=inputs)
+                inputs=arguments)
         )
 
     signal = events.on_failure_task_signal

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/orchestrator/workflows/executor/test_process_executor_extension.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/workflows/executor/test_process_executor_extension.py b/tests/orchestrator/workflows/executor/test_process_executor_extension.py
index 878ac24..b5f49ba 100644
--- a/tests/orchestrator/workflows/executor/test_process_executor_extension.py
+++ b/tests/orchestrator/workflows/executor/test_process_executor_extension.py
@@ -27,7 +27,7 @@ from tests import storage
 
 
 def test_decorate_extension(context, executor):
-    inputs = {'input1': 1, 'input2': 2}
+    arguments = {'input1': 1, 'input2': 2}
 
     def get_node(ctx):
         return ctx.model.node.get_by_name(mock.models.DEPENDENCY_NODE_NAME)
@@ -41,24 +41,23 @@ def test_decorate_extension(context, executor):
             ctx.service,
             interface_name,
             operation_name,
-            operation_kwargs=dict(implementation='{0}.{1}'.format(__name__,
-                                                                  _mock_operation.__name__),
-                                  inputs=inputs)
+            operation_kwargs=dict(function='{0}.{1}'.format(__name__, _mock_operation.__name__),
+                                  arguments=arguments)
         )
         node.interfaces[interface.name] = interface
         task = api.task.OperationTask(
             node,
             interface_name=interface_name,
             operation_name=operation_name,
-            inputs=inputs)
+            inputs=arguments)
         graph.add_tasks(task)
         return graph
     graph = mock_workflow(ctx=context)  # pylint: disable=no-value-for-parameter
     eng = engine.Engine(executor=executor, workflow_context=context, tasks_graph=graph)
     eng.execute()
     out = get_node(context).runtime_properties['out']
-    assert out['wrapper_inputs'] == inputs
-    assert out['function_inputs'] == inputs
+    assert out['wrapper_inputs'] == arguments
+    assert out['function_inputs'] == arguments
 
 
 @extension.process_executor

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/orchestrator/workflows/executor/test_process_executor_tracked_changes.py
----------------------------------------------------------------------
diff --git a/tests/orchestrator/workflows/executor/test_process_executor_tracked_changes.py b/tests/orchestrator/workflows/executor/test_process_executor_tracked_changes.py
index 4fbe9c1..fb9a20d 100644
--- a/tests/orchestrator/workflows/executor/test_process_executor_tracked_changes.py
+++ b/tests/orchestrator/workflows/executor/test_process_executor_tracked_changes.py
@@ -90,20 +90,20 @@ def _run_workflow(context, executor, op_func, inputs=None):
         node = ctx.model.node.get_by_name(mock.models.DEPENDENCY_NODE_NAME)
         interface_name = 'test_interface'
         operation_name = 'operation'
-        wf_inputs = inputs or {}
+        wf_arguments = inputs or {}
         interface = mock.models.create_interface(
             ctx.service,
             interface_name,
             operation_name,
-            operation_kwargs=dict(implementation=_operation_mapping(op_func),
-                                  inputs=wf_inputs)
+            operation_kwargs=dict(function=_operation_mapping(op_func),
+                                  arguments=wf_arguments)
         )
         node.interfaces[interface.name] = interface
         task = api.task.OperationTask(
             node,
             interface_name=interface_name,
             operation_name=operation_name,
-            inputs=wf_inputs)
+            inputs=wf_arguments)
         graph.add_tasks(task)
         return graph
     graph = mock_workflow(ctx=context)  # pylint: disable=no-value-for-parameter

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/84d8da59/tests/resources/service-templates/tosca-simple-1.0/node-cellar/node-cellar.yaml
----------------------------------------------------------------------
diff --git a/tests/resources/service-templates/tosca-simple-1.0/node-cellar/node-cellar.yaml b/tests/resources/service-templates/tosca-simple-1.0/node-cellar/node-cellar.yaml
index 8e80640..ee9e094 100644
--- a/tests/resources/service-templates/tosca-simple-1.0/node-cellar/node-cellar.yaml
+++ b/tests/resources/service-templates/tosca-simple-1.0/node-cellar/node-cellar.yaml
@@ -104,6 +104,16 @@ topology_template:
         Maintenance:
           enable: juju > charm.maintenance_on
           disable: juju > charm.maintenance_off
+        Standard:
+          create:
+            implementation:
+              primary: create_node_cellar.sh
+              dependencies:
+                - "process.args.1 > { get_attribute: [ SELF, tosca_id ] }"
+                - "process.args.2 > { get_property: [ HOST, flavor_name ] }"
+                - ssh.user > admin
+                - ssh.password > '1234'
+                - ssh.use_sudo > true
       requirements:
         - database: node_cellar_database
       capabilities:
@@ -161,16 +171,7 @@ topology_template:
             relationship:
               interfaces:
                 Configure:
-                  target_changed:
-                    implementation:
-                      primary: changed.sh
-                      dependencies:
-                        #- { concat: [ process.args.1 >, mongodb ] }
-                        - process.args.1 > mongodb
-                        - process.args.2 > host
-                        - ssh.user > admin
-                        - ssh.password > 1234
-                        - ssh.use_sudo > true
+                  target_changed: changed.sh
 
     nginx:
       type: nginx.Nginx
@@ -251,6 +252,7 @@ topology_template:
         Standard:
           inputs:
             openstack_credential: { get_input: openstack_credential }
+          create: create_data_volume.sh
 
   groups:
   
@@ -309,7 +311,7 @@ policy_types:
       client connections cleanly and shut down services. 
     derived_from: aria.Workflow
     properties:
-      implementation:
+      function:
         type: string
         default: workflows.maintenance
       enabled: