[09/19] vxquery git commit: Working on array runtime constructor

[pr...@apache.org]

http://git-wip-us.apache.org/repos/asf/vxquery/blob/47442458/vxquery-core/src/main/java/org/apache/vxquery/functions/builtin-operators.xml
----------------------------------------------------------------------
diff --git a/vxquery-core/src/main/java/org/apache/vxquery/functions/builtin-operators.xml b/vxquery-core/src/main/java/org/apache/vxquery/functions/builtin-operators.xml
index c367725..cb1bf7d 100644
--- a/vxquery-core/src/main/java/org/apache/vxquery/functions/builtin-operators.xml
+++ b/vxquery-core/src/main/java/org/apache/vxquery/functions/builtin-operators.xml
@@ -1,1023 +1,1148 @@
 <?xml version="1.0"?>
-<!--
-  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.
--->
+<!-- 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. -->
 <operators>
-    <!-- op:add-dayTimeDuration-to-date( $arg1 as xs:date, $arg2 as xs:dayTimeDuration)  as xs:date -->
-    <operator name="op:add-dayTimeDuration-to-date">
-        <param name="arg1" type="xs:date"/>
-        <param name="arg2" type="xs:dayTimeDuration"/>
-        <return type="xs:date"/>
-    </operator>
-
-    <!-- op:add-dayTimeDuration-to-dateTime( $arg1 as xs:dateTime, $arg2 as xs:dayTimeDuration)  as xs:dateTime -->
-    <operator name="op:add-dayTimeDuration-to-dateTime">
-        <param name="arg1" type="xs:dateTime"/>
-        <param name="arg2" type="xs:dayTimeDuration"/>
-        <return type="xs:dateTime"/>
-    </operator>
-
-    <!-- op:add-dayTimeDuration-to-time( $arg1 as xs:time, $arg2 as xs:dayTimeDuration)  as xs:time -->
-    <operator name="op:add-dayTimeDuration-to-time">
-        <param name="arg1" type="xs:time"/>
-        <param name="arg2" type="xs:dayTimeDuration"/>
-        <return type="xs:time"/>
-    </operator>
-
-    <!-- op:add-dayTimeDurations( $arg1 as xs:dayTimeDuration, $arg2 as xs:dayTimeDuration)  as xs:dayTimeDuration -->
-    <operator name="op:add-dayTimeDurations">
-        <param name="arg1" type="xs:dayTimeDuration"/>
-        <param name="arg2" type="xs:dayTimeDuration"/>
-        <return type="xs:dayTimeDuration"/>
-    </operator>
-
-    <!-- op:add-yearMonthDuration-to-date( $arg1 as xs:date, $arg2 as xs:yearMonthDuration)  as xs:date -->
-    <operator name="op:add-yearMonthDuration-to-date">
-        <param name="arg1" type="xs:date"/>
-        <param name="arg2" type="xs:yearMonthDuration"/>
-        <return type="xs:date"/>
-    </operator>
-
-    <!-- op:add-yearMonthDuration-to-dateTime( $arg1 as xs:dateTime, $arg2 as xs:yearMonthDuration)  as xs:dateTime -->
-    <operator name="op:add-yearMonthDuration-to-dateTime">
-        <param name="arg1" type="xs:dateTime"/>
-        <param name="arg2" type="xs:yearMonthDuration"/>
-        <return type="xs:dateTime"/>
-    </operator>
-
-    <!-- op:add-yearMonthDurations( $arg1 as xs:yearMonthDuration, $arg2 as xs:yearMonthDuration)  as xs:yearMonthDuration -->
-    <operator name="op:add-yearMonthDurations">
-        <param name="arg1" type="xs:yearMonthDuration"/>
-        <param name="arg2" type="xs:yearMonthDuration"/>
-        <return type="xs:yearMonthDuration"/>
-    </operator>
-
-    <!-- op:base64Binary-equal( $value1 as xs:base64Binary, $value2 as xs:base64Binary)  as xs:boolean -->
-    <operator name="op:base64Binary-equal">
-        <param name="value1" type="xs:base64Binary"/>
-        <param name="value2" type="xs:base64Binary"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:boolean-equal($value1  as xs:boolean, $value2 as xs:boolean)  as xs:boolean -->
-    <operator name="op:boolean-equal">
-        <param name="value1" type="xs:boolean"/>
-        <param name="value2" type="xs:boolean"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:boolean-greater-than( $arg1 as xs:boolean, $arg2 as xs:boolean)  as xs:boolean -->
-    <operator name="op:boolean-greater-than">
-        <param name="value1" type="xs:boolean"/>
-        <param name="value2" type="xs:boolean"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:boolean-less-than( $arg1 as xs:boolean, $arg2 as xs:boolean)  as xs:boolean -->
-    <operator name="op:boolean-less-than">
-        <param name="value1" type="xs:boolean"/>
-        <param name="value2" type="xs:boolean"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:concatenate($arg as item()*)  as item()* -->
-    <operator name="op:concatenate" varargs="true">
-        <param name="arg" type="item()*"/>
-        <return type="item()*"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.sequence.ConcatenateScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- op:date-equal($arg1  as xs:date, $arg2 as xs:date)  as xs:boolean -->
-    <operator name="op:date-equal">
-        <param name="arg1" type="xs:date"/>
-        <param name="arg2" type="xs:date"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:date-greater-than( $arg1 as xs:date, $arg2 as xs:date)  as xs:boolean -->
-    <operator name="op:date-greater-than">
-        <param name="arg1" type="xs:date"/>
-        <param name="arg2" type="xs:date"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:date-less-than($arg1  as xs:date, $arg2 as xs:date)  as xs:boolean -->
-    <operator name="op:date-less-than">
-        <param name="arg1" type="xs:date"/>
-        <param name="arg2" type="xs:date"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:dateTime-equal($arg1  as xs:dateTime, $arg2 as xs:dateTime)  as xs:boolean -->
-    <operator name="op:dateTime-equal">
-        <param name="arg1" type="xs:dateTime"/>
-        <param name="arg2" type="xs:dateTime"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:dateTime-greater-than( $arg1 as xs:dateTime, $arg2 as xs:dateTime)  as xs:boolean -->
-    <operator name="op:dateTime-greater-than">
-        <param name="arg1" type="xs:dateTime"/>
-        <param name="arg2" type="xs:dateTime"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:dateTime-less-than( $arg1 as xs:dateTime, $arg2 as xs:dateTime)  as xs:boolean -->
-    <operator name="op:dateTime-less-than">
-        <param name="arg1" type="xs:dateTime"/>
-        <param name="arg2" type="xs:dateTime"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:dayTimeDuration-greater-than( $arg1 as xs:dayTimeDuration, $arg2 as xs:dayTimeDuration)  as xs:boolean -->
-    <operator name="op:dayTimeDuration-greater-than">
-        <param name="arg1" type="xs:dayTimeDuration"/>
-        <param name="arg2" type="xs:dayTimeDuration"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:dayTimeDuration-less-than( $arg1 as xs:dayTimeDuration, $arg2 as xs:dayTimeDuration)  as xs:boolean -->
-    <operator name="op:dayTimeDuration-less-than">
-        <param name="arg1" type="xs:dayTimeDuration"/>
-        <param name="arg2" type="xs:dayTimeDuration"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:divide-dayTimeDuration( $arg1 as xs:dayTimeDuration, $arg2 as xs:double)  as xs:dayTimeDuration -->
-    <operator name="op:divide-dayTimeDuration">
-        <param name="arg1" type="xs:dayTimeDuration"/>
-        <param name="arg2" type="xs:double"/>
-        <return type="xs:dayTimeDuration"/>
-    </operator>
-
-    <!-- op:divide-dayTimeDuration-by-dayTimeDuration( $arg1 as xs:dayTimeDuration, $arg2 as xs:dayTimeDuration)  as xs:decimal -->
-    <operator name="op:divide-dayTimeDuration-by-dayTimeDuration">
-        <param name="arg1" type="xs:dayTimeDuration"/>
-        <param name="arg2" type="xs:dayTimeDuration"/>
-        <return type="xs:decimal"/>
-    </operator>
-
-    <!-- op:divide-yearMonthDuration( $arg1 as xs:yearMonthDuration, $arg2 as xs:double)  as xs:yearMonthDuration -->
-    <operator name="op:divide-yearMonthDuration">
-        <param name="arg1" type="xs:yearMonthDuration"/>
-        <param name="arg2" type="xs:double"/>
-        <return type="xs:yearMonthDuration"/>
-    </operator>
-
-    <!-- op:divide-yearMonthDuration-by-yearMonthDuration( $arg1 as xs:yearMonthDuration, $arg2 as xs:yearMonthDuration)  as xs:decimal -->
-    <operator name="op:divide-yearMonthDuration-by-yearMonthDuration">
-        <param name="arg1" type="xs:yearMonthDuration"/>
-        <param name="arg2" type="xs:yearMonthDuration"/>
-        <return type="xs:decimal"/>
-    </operator>
-
-    <!-- op:duration-equal($arg1  as xs:duration, $arg2 as xs:duration)  as xs:boolean -->
-    <operator name="op:duration-equal">
-        <param name="arg1" type="xs:duration"/>
-        <param name="arg2" type="xs:duration"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:except($parameter1  as node()*, $parameter2 as node()*)  as node()* -->
-    <operator name="op:except">
-        <param name="parameter1" type="node()*"/>
-        <param name="parameter2" type="node()*"/>
-        <return type="node()*"/>
-        <!-- implementation assumes input in document order -->
-        <property type="DocumentOrder" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-        <property type="UniqueNodes" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-    </operator>
-
-    <!-- op:gDay-equal($arg1  as xs:gDay, $arg2 as xs:gDay)  as xs:boolean -->
-    <operator name="op:gDay-equal">
-        <param name="arg1" type="xs:gDay"/>
-        <param name="arg2" type="xs:gDay"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:gMonth-equal($arg1  as xs:gMonth, $arg2 as xs:gMonth)  as xs:boolean -->
-    <operator name="op:gMonth-equal">
-        <param name="arg1" type="xs:gMonth"/>
-        <param name="arg2" type="xs:gMonth"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:gMonthDay-equal($arg1  as xs:gMonthDay, $arg2 as xs:gMonthDay)  as xs:boolean -->
-    <operator name="op:gMonthDay-equal">
-        <param name="arg1" type="xs:gMonthDay"/>
-        <param name="arg2" type="xs:gMonthDay"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:gYear-equal($arg1  as xs:gYear, $arg2 as xs:gYear)  as xs:boolean -->
-    <operator name="op:gYear-equal">
-        <param name="arg1" type="xs:gYear"/>
-        <param name="arg2" type="xs:gYear"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:gYearMonth-equal( $arg1 as xs:gYearMonth, $arg2 as xs:gYearMonth)  as xs:boolean -->
-    <operator name="op:gYearMonth-equal">
-        <param name="arg1" type="xs:gYearMonth"/>
-        <param name="arg2" type="xs:gYearMonth"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:hexBinary-equal($value1 as xs:hexBinary, $value2 as xs:hexBinary) as xs:boolean -->
-    <operator name="op:hexBinary-equal">
-        <param name="arg1" type="xs:hexBinary"/>
-        <param name="arg2" type="xs:hexBinary"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:intersect($parameter1 as node()*, $parameter2 as node()*) as node()* -->
-    <operator name="op:intersect">
-        <param name="parameter1" type="node()*"/>
-        <param name="parameter2" type="node()*"/>
-        <return type="node()*"/>
-        <!-- implementation assumes input in document order -->
-        <property type="DocumentOrder" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-        <property type="UniqueNodes" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-    </operator>
-
-    <!-- op:is-same-node($parameter1 as node(), $parameter2 as node()) as xs:boolean -->
-    <operator name="op:is-same-node">
-        <param name="parameter1" type="node()"/>
-        <param name="parameter2" type="node()"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:multiply-dayTimeDuration( $arg1 as xs:dayTimeDuration, $arg2 as xs:double)  as xs:dayTimeDuration -->
-    <operator name="op:multiply-dayTimeDuration">
-        <param name="arg1" type="xs:dayTimeDuration"/>
-        <param name="arg2" type="xs:double"/>
-        <return type="xs:dayTimeDuration"/>
-    </operator>
-
-    <!-- op:multiply-yearMonthDuration( $arg1 as xs:yearMonthDuration, $arg2 as xs:double)  as xs:yearMonthDuration -->
-    <operator name="op:multiply-yearMonthDuration">
-        <param name="arg1" type="xs:yearMonthDuration"/>
-        <param name="arg2" type="xs:double"/>
-        <return type="xs:yearMonthDuration"/>
-    </operator>
-
-    <!-- op:node-after($parameter1  as node(), $parameter2 as node())  as xs:boolean -->
-    <operator name="op:node-after">
-        <param name="parameter1" type="node()"/>
-        <param name="parameter2" type="node()"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.node.OpNodeAfterEvaluatorFactory"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:node-before($parameter1  as node(), $parameter2 as node())  as xs:boolean -->
-    <operator name="op:node-before">
-        <param name="parameter1" type="node()"/>
-        <param name="parameter2" type="node()"/>
-        <return type="xs:boolean"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.node.OpNodeBeforeEvaluatorFactory"/>
-    </operator>
-
-    <!-- op:NOTATION-equal($arg1  as xs:NOTATION, $arg2 as xs:NOTATION)  as xs:boolean -->
-    <operator name="op:NOTATION-equal">
-        <param name="arg1" type="xs:NOTATION"/>
-        <param name="arg2" type="xs:NOTATION"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:numeric-add($arg1  as numeric, $arg2 as numeric)  as numeric -->
-    <operator name="op:numeric-add">
-        <param name="arg1" type="xsext:numeric"/>
-        <param name="arg2" type="xsext:numeric"/>
-        <return type="xsext:numeric"/>
-    </operator>
-
-    <!-- op:numeric-divide($arg1  as numeric, $arg2 as numeric)  as numeric -->
-    <operator name="op:numeric-divide">
-        <param name="arg1" type="xsext:numeric"/>
-        <param name="arg2" type="xsext:numeric"/>
-        <return type="xsext:numeric"/>
-    </operator>
-
-    <!-- op:numeric-equal($arg1  as numeric, $arg2 as numeric)  as xs:boolean -->
-    <operator name="op:numeric-equal">
-        <param name="arg1" type="xsext:numeric"/>
-        <param name="arg2" type="xsext:numeric"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:numeric-greater-than( $arg1 as numeric, $arg2 as numeric)  as xs:boolean -->
-    <operator name="op:numeric-greater-than">
-        <param name="arg1" type="xsext:numeric"/>
-        <param name="arg2" type="xsext:numeric"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:numeric-integer-divide( $arg1 as numeric, $arg2 as numeric)  as xs:integer -->
-    <operator name="op:numeric-integer-divide">
-        <param name="arg1" type="xsext:numeric"/>
-        <param name="arg2" type="xsext:numeric"/>
-        <return type="xs:integer"/>
-    </operator>
-
-    <!-- op:numeric-less-than( $arg1 as numeric, $arg2 as numeric)  as xs:boolean -->
-    <operator name="op:numeric-less-than">
-        <param name="arg1" type="xsext:numeric"/>
-        <param name="arg2" type="xsext:numeric"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:numeric-mod($arg1  as numeric, $arg2 as numeric)  as numeric -->
-    <operator name="op:numeric-mod">
-        <param name="arg1" type="xsext:numeric"/>
-        <param name="arg2" type="xsext:numeric"/>
-        <return type="xsext:numeric"/>
-    </operator>
-
-    <!-- op:numeric-multiply( $arg1 as numeric, $arg2 as numeric)  as numeric -->
-    <operator name="op:numeric-multiply">
-        <param name="arg1" type="xsext:numeric"/>
-        <param name="arg2" type="xsext:numeric"/>
-        <return type="xsext:numeric"/>
-    </operator>
-
-    <!-- op:numeric-subtract( $arg1 as numeric, $arg2 as numeric)  as numeric -->
-    <operator name="op:numeric-subtract">
-        <param name="arg1" type="xsext:numeric"/>
-        <param name="arg2" type="xsext:numeric"/>
-        <return type="xsext:numeric"/>
-    </operator>
-
-    <!-- op:numeric-unary-minus( $arg as numeric) as  numeric -->
-    <operator name="op:numeric-unary-minus">
-        <param name="arg1" type="xsext:numeric"/>
-        <return type="xsext:numeric"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.unary.NumericUnaryMinusScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- op:numeric-unary-plus( $arg as numeric) as  numeric -->
-    <operator name="op:numeric-unary-plus">
-        <param name="arg1" type="xsext:numeric"/>
-        <return type="xsext:numeric"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.unary.NumericUnaryPlusScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- op:QName-equal($arg1  as xs:QName, $arg2 as xs:QName)  as xs:boolean -->
-    <operator name="op:QName-equal">
-        <param name="arg1" type="xs:QName"/>
-        <param name="arg2" type="xs:QName"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:subtract-dates($arg1  as xs:date, $arg2 as xs:date)  as xs:dayTimeDuration? -->
-    <operator name="op:subtract-dates">
-        <param name="arg1" type="xs:date"/>
-        <param name="arg2" type="xs:date"/>
-        <return type="xs:dayTimeDuration?"/>
-    </operator>
-
-    <!-- op:subtract-dateTimes( $arg1 as xs:dateTime, $arg2 as xs:dateTime)  as xs:dayTimeDuration? -->
-    <operator name="op:subtract-dateTimes">
-        <param name="arg1" type="xs:dateTime"/>
-        <param name="arg2" type="xs:dateTime"/>
-        <return type="xs:dayTimeDuration?"/>
-    </operator>
-
-    <!-- op:subtract-dayTimeDuration-from-date( $arg1 as xs:date, $arg2 as xs:dayTimeDuration)  as xs:date -->
-    <operator name="op:subtract-dayTimeDuration-from-date">
-        <param name="arg1" type="xs:date"/>
-        <param name="arg2" type="xs:dayTimeDuration"/>
-        <return type="xs:date"/>
-    </operator>
-
-    <!-- op:subtract-dayTimeDuration-from-dateTime( $arg1 as xs:dateTime, $arg2 as xs:dayTimeDuration)  as xs:dateTime -->
-    <operator name="op:subtract-dayTimeDuration-from-dateTime">
-        <param name="arg1" type="xs:dateTime"/>
-        <param name="arg2" type="xs:dayTimeDuration"/>
-        <return type="xs:dateTime"/>
-    </operator>
-
-    <!-- op:subtract-dayTimeDuration-from-time( $arg1 as xs:time, $arg2 as xs:dayTimeDuration)  as xs:time -->
-    <operator name="op:subtract-dayTimeDuration-from-time">
-        <param name="arg1" type="xs:time"/>
-        <param name="arg2" type="xs:dayTimeDuration"/>
-        <return type="xs:time"/>
-    </operator>
-
-    <!-- op:subtract-dayTimeDurations( $arg1 as xs:dayTimeDuration, $arg2 as xs:dayTimeDuration)  as xs:dayTimeDuration -->
-    <operator name="op:subtract-dayTimeDurations">
-        <param name="arg1" type="xs:dayTimeDuration"/>
-        <param name="arg2" type="xs:dayTimeDuration"/>
-        <return type="xs:dayTimeDuration"/>
-    </operator>
-
-    <!-- op:subtract-times($arg1  as xs:time, $arg2 as xs:time)  as xs:dayTimeDuration -->
-    <operator name="op:subtract-times">
-        <param name="arg1" type="xs:time"/>
-        <param name="arg2" type="xs:time"/>
-        <return type="xs:dayTimeDuration"/>
-    </operator>
-
-    <!-- op:subtract-yearMonthDuration-from-date( $arg1 as xs:date, $arg2 as xs:yearMonthDuration)  as xs:date -->
-    <operator name="op:subtract-yearMonthDuration-from-date">
-        <param name="arg1" type="xs:date"/>
-        <param name="arg2" type="xs:yearMonthDuration"/>
-        <return type="xs:date"/>
-    </operator>
-
-    <!-- op:subtract-yearMonthDuration-from-dateTime( $arg1 as xs:dateTime, $arg2 as xs:yearMonthDuration)  as xs:dateTime -->
-    <operator name="op:subtract-yearMonthDuration-from-dateTime">
-        <param name="arg1" type="xs:dateTime"/>
-        <param name="arg2" type="xs:yearMonthDuration"/>
-        <return type="xs:dateTime"/>
-    </operator>
-
-    <!-- op:subtract-yearMonthDurations( $arg1 as xs:yearMonthDuration, $arg2 as xs:yearMonthDuration)  as xs:yearMonthDuration -->
-    <operator name="op:subtract-yearMonthDurations">
-        <param name="arg1" type="xs:yearMonthDuration"/>
-        <param name="arg2" type="xs:yearMonthDuration"/>
-        <return type="xs:yearMonthDuration"/>
-    </operator>
-
-    <!-- op:time-equal($arg1  as xs:time, $arg2 as xs:time)  as xs:boolean -->
-    <operator name="op:time-equal">
-        <param name="arg1" type="xs:time"/>
-        <param name="arg2" type="xs:time"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:time-greater-than( $arg1 as xs:time, $arg2 as xs:time)  as xs:boolean -->
-    <operator name="op:time-greater-than">
-        <param name="arg1" type="xs:time"/>
-        <param name="arg2" type="xs:time"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:time-less-than($arg1  as xs:time, $arg2 as xs:time)  as xs:boolean -->
-    <operator name="op:time-less-than">
-        <param name="arg1" type="xs:time"/>
-        <param name="arg2" type="xs:time"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:to($firstval as  xs:integer, $lastval as xs:integer)  as xs:integer* -->
-    <operator name="op:to">
-        <param name="firstval" type="xs:integer"/>
-        <param name="lastval" type="xs:integer"/>
-        <return type="xs:integer*"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.sequence.OpToScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- op:union($parameter1  as node()*, $parameter2 as node()*)  as node()* -->
-    <operator name="op:union">
-        <param name="parameter1" type="node()*"/>
-        <param name="parameter2" type="node()*"/>
-        <return type="node()*"/>
-        <!-- as we do the doc-order-sort and the duplicate elimination -->
-        <!-- after the concatenation, we can reuse the concat iterator -->
-        <property type="DocumentOrder" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-        <property type="UniqueNodes" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-    </operator>
-
-    <!-- op:yearMonthDuration-greater-than( $arg1 as xs:yearMonthDuration, $arg2 as xs:yearMonthDuration)  as xs:boolean -->
-    <operator name="op:yearMonthDuration-greater-than">
-        <param name="arg1" type="xs:yearMonthDuration"/>
-        <param name="arg2" type="xs:yearMonthDuration"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- op:yearMonthDuration-less-than( $arg1 as xs:yearMonthDuration, $arg2 as xs:yearMonthDuration)  as xs:boolean -->
-    <operator name="op:yearMonthDuration-less-than">
-        <param name="arg1" type="xs:yearMonthDuration"/>
-        <param name="arg2" type="xs:yearMonthDuration"/>
-        <return type="xs:boolean"/>
-    </operator>
-
-    <!-- fn:avg-local($arg as xs:anyAtomicType*) as xs:anyAtomicType? -->
-    <operator name="opext:avg-local">
-        <param name="arg" type="xs:anyAtomicType*"/>
-        <return type="xs:anyAtomicType?"/>
-        <runtime type="aggregate" class="org.apache.vxquery.runtime.functions.aggregate.AvgLocalAggregateEvaluatorFactory"/>
-    </operator>
-
-    <!-- fn:avg-global($arg as xs:anyAtomicType*) as xs:anyAtomicType? -->
-    <operator name="opext:avg-global">
-        <param name="arg" type="xs:anyAtomicType*"/>
-        <return type="xs:anyAtomicType?"/>
-        <runtime type="aggregate" class="org.apache.vxquery.runtime.functions.aggregate.AvgGlobalAggregateEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:ordered($arg as item()*) as item()* -->
-    <operator name="opext:ordered">
-        <param name="arg" type="item()*"/>
-        <return type="item()*"/>
-    </operator>
-
-    <!-- opext:unordered($arg as item()*) as item()* -->
-    <operator name="opext:unordered">
-        <param name="arg" type="item()*"/>
-        <return type="item()*"/>
-    </operator>
-
-    <!-- opext:value-eq($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) as xs:boolean? -->
-    <operator name="opext:value-eq">
-        <param name="arg1" type="xs:anyAtomicType?"/>
-        <param name="arg2" type="xs:anyAtomicType?"/>
-        <return type="xs:boolean?"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.comparison.ValueEqComparisonScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:value-ne($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) as xs:boolean? -->
-    <operator name="opext:value-ne">
-        <param name="arg1" type="xs:anyAtomicType?"/>
-        <param name="arg2" type="xs:anyAtomicType?"/>
-        <return type="xs:boolean?"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.comparison.ValueNeComparisonScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:value-lt($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) as xs:boolean? -->
-    <operator name="opext:value-lt">
-        <param name="arg1" type="xs:anyAtomicType?"/>
-        <param name="arg2" type="xs:anyAtomicType?"/>
-        <return type="xs:boolean?"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.comparison.ValueLtComparisonScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:value-le($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) as xs:boolean? -->
-    <operator name="opext:value-le">
-        <param name="arg1" type="xs:anyAtomicType?"/>
-        <param name="arg2" type="xs:anyAtomicType?"/>
-        <return type="xs:boolean?"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.comparison.ValueLeComparisonScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:value-gt($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) as xs:boolean? -->
-    <operator name="opext:value-gt">
-        <param name="arg1" type="xs:anyAtomicType?"/>
-        <param name="arg2" type="xs:anyAtomicType?"/>
-        <return type="xs:boolean?"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.comparison.ValueGtComparisonScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:value-ge($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) as xs:boolean? -->
-    <operator name="opext:value-ge">
-        <param name="arg1" type="xs:anyAtomicType?"/>
-        <param name="arg2" type="xs:anyAtomicType?"/>
-        <return type="xs:boolean?"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.comparison.ValueGeComparisonScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:general-eq($arg1 as item()*, $arg2 as item()*) as xs:boolean -->
-    <operator name="opext:general-eq">
-        <param name="arg1" type="item()*"/>
-        <param name="arg2" type="item()*"/>
-        <return type="xs:boolean"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.comparison.general.GeneralEqComparisonScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:general-ne($arg1 as item()*, $arg2 as item()*) as xs:boolean -->
-    <operator name="opext:general-ne">
-        <param name="arg1" type="item()*"/>
-        <param name="arg2" type="item()*"/>
-        <return type="xs:boolean"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.comparison.general.GeneralNeComparisonScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:general-lt($arg1 as item()*, $arg2 as item()*) as xs:boolean -->
-    <operator name="opext:general-lt">
-        <param name="arg1" type="item()*"/>
-        <param name="arg2" type="item()*"/>
-        <return type="xs:boolean"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.comparison.general.GeneralLtComparisonScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:general-le($arg1 as item()*, $arg2 as item()*) as xs:boolean -->
-    <operator name="opext:general-le">
-        <param name="arg1" type="item()*"/>
-        <param name="arg2" type="item()*"/>
-        <return type="xs:boolean"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.comparison.general.GeneralLeComparisonScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:general-gt($arg1 as item()*, $arg2 as item()*) as xs:boolean -->
-    <operator name="opext:general-gt">
-        <param name="arg1" type="item()*"/>
-        <param name="arg2" type="item()*"/>
-        <return type="xs:boolean"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.comparison.general.GeneralGtComparisonScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:general-ge($arg1 as item()*, $arg2 as item()*) as xs:boolean -->
-    <operator name="opext:general-ge">
-        <param name="arg1" type="item()*"/>
-        <param name="arg2" type="item()*"/>
-        <return type="xs:boolean"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.comparison.general.GeneralGeComparisonScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:add($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) as xs:anyAtomicType? -->
-    <operator name="opext:add">
-        <param name="arg1" type="xs:anyAtomicType?"/>
-        <param name="arg2" type="xs:anyAtomicType?"/>
-        <return type="xs:anyAtomicType?"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.arithmetic.AddScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:subtract($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) as xs:anyAtomicType? -->
-    <operator name="opext:subtract">
-        <param name="arg1" type="xs:anyAtomicType?"/>
-        <param name="arg2" type="xs:anyAtomicType?"/>
-        <return type="xs:anyAtomicType?"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.arithmetic.SubtractScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:multiply($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) as xs:anyAtomicType? -->
-    <operator name="opext:multiply">
-        <param name="arg1" type="xs:anyAtomicType?"/>
-        <param name="arg2" type="xs:anyAtomicType?"/>
-        <return type="xs:anyAtomicType?"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.arithmetic.MultiplyScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:divide($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) as xs:anyAtomicType? -->
-    <operator name="opext:divide">
-        <param name="arg1" type="xs:anyAtomicType?"/>
-        <param name="arg2" type="xs:anyAtomicType?"/>
-        <return type="xs:anyAtomicType?"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.arithmetic.DivideScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:idiv($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) as xs:anyAtomicType? -->
-    <operator name="opext:idiv">
-        <param name="arg1" type="xsext:numeric?"/>
-        <param name="arg2" type="xsext:numeric?"/>
-        <return type="xs:integer?"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.arithmetic.IntegerDivideScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:mod($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) as xs:anyAtomicType? -->
-    <operator name="opext:mod">
-        <param name="arg1" type="xsext:numeric?"/>
-        <param name="arg2" type="xsext:numeric?"/>
-        <return type="xs:integer?"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.arithmetic.ModScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:and($arg1 as xs:boolean?, $arg2 as xs:boolean?) as xs:boolean? -->
-    <operator name="opext:and">
-        <param name="arg1" type="xs:boolean?"/>
-        <param name="arg2" type="xs:boolean?"/>
-        <return type="xs:boolean?"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.bool.AndScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:or($arg1 as xs:boolean?, $arg2 as xs:boolean?) as xs:boolean? -->
-    <operator name="opext:or">
-        <param name="arg1" type="xs:boolean?"/>
-        <param name="arg2" type="xs:boolean?"/>
-        <return type="xs:boolean?"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.bool.OrScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:sort-nodes-asc($arg as node()*) as node()* -->
-    <operator name="opext:sort-nodes-asc">
-        <param name="arg" type="node()*"/>
-        <return type="node()*"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.nodeid.SortDistinctNodesAscOrAtomicsScalarEvaluatorFactory"/>
-        <property type="UniqueNodes" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-    </operator>
-
-    <!-- opext:sort-nodes-asc-or-atomics($arg as item()*) as item()* -->
-    <operator name="opext:sort-nodes-asc-or-atomics">
-        <param name="arg" type="item()*"/>
-        <return type="item()*"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.nodeid.SortDistinctNodesAscOrAtomicsScalarEvaluatorFactory"/>
-        <property type="UniqueNodes" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-    </operator>
-
-    <!-- opext:sort-distinct-nodes-asc($arg as node()*) as node()* -->
-    <operator name="opext:sort-distinct-nodes-asc">
-        <param name="arg" type="node()*"/>
-        <return type="node()*"/>
-        <property type="UniqueNodes" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-    </operator>
-    
-    <!-- opext:sort-distinct-nodes-asc-or-atomics($arg as item()*) as item()* -->
-    <operator name="opext:sort-distinct-nodes-asc-or-atomics">
-        <param name="arg" type="item()*"/>
-        <return type="item()*"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.nodeid.SortDistinctNodesAscOrAtomicsScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:distinct-nodes-or-atomics($arg as item()*) as item()* -->
-    <operator name="opext:distinct-nodes-or-atomics">
-        <param name="arg" type="item()*"/>
-        <return type="item()*"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.nodeid.SortDistinctNodesAscOrAtomicsScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:sort-nodes-desc($arg as node()*) as node()* -->
-    <operator name="opext:sort-nodes-desc">
-        <param name="arg" type="node()*"/>
-        <return type="node()*"/>
-        <property type="UniqueNodes" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-    </operator>
-
-    <!-- opext:sort-nodes-desc-or-atomics($arg as item()*) as item()* -->
-    <operator name="opext:sort-nodes-desc-or-atomics">
-        <param name="arg" type="item()*"/>
-        <return type="item()*"/>
-        <property type="UniqueNodes" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-    </operator>
-
-    <!-- opext:sort-distinct-nodes-desc($arg as node()*) as node()* -->
-    <operator name="opext:sort-distinct-nodes-desc">
-        <param name="arg" type="node()*"/>
-        <return type="node()*"/>
-    </operator>
-
-    <!-- opext:sort-distinct-nodes-desc-or-atomics($arg as item()*) as item()* -->
-    <operator name="opext:sort-distinct-nodes-desc-or-atomics">
-        <param name="arg" type="item()*"/>
-        <return type="item()*"/>
-    </operator>
-
-    <!-- opext:id-from-node($arg as item()) as xs:integer -->
-    <operator name="opext:id-from-node">
-        <param name="arg" type="item()"/>
-        <return type="xs:integer"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.node.IdFromNodeScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:local-id-from-node($arg as item()) as xs:int -->
-    <operator name="opext:local-id-from-node">
-        <param name="arg" type="item()"/>
-        <return type="xs:int"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.node.LocalIdFromNodeScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:tree-id-from-node($arg as item()) as xs:int -->
-    <operator name="opext:tree-id-from-node">
-        <param name="arg" type="item()"/>
-        <return type="xs:int"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.node.TreeIdFromNodeScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:deflate-sequences($arg as item()*) as item()* -->
-    <operator name="opext:deflate-sequences">
-        <param name="arg" type="item()*"/>
-        <return type="item()*"/>
-        <property type="DocumentOrder" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-        <property type="UniqueNodes" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-    </operator>
-
-    <!-- opext:pi-constructor($target as xs:sring, $content as xs:string) as node() -->
-    <operator name="opext:pi-constructor">
-        <param name="target" type="xs:string"/>
-        <param name="content" type="xs:string"/>
-        <return type="node()"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.node.PINodeConstructorScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:comment-constructor($content as xs:string) as node() -->
-    <operator name="opext:comment-constructor">
-        <param name="content" type="xs:string"/>
-        <return type="node()"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.node.CommentNodeConstructorScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:element-constructor($name as xs:QName, $content as item()*) as node() -->
-    <operator name="opext:element-constructor">
-        <param name="name" type="xs:QName"/>
-        <param name="content" type="item()*"/>
-        <return type="node()"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.node.ElementNodeConstructorScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:attribute-constructor($name as xs:QName, $content as xs:anyAtomicType*) as node() -->
-    <operator name="opext:attribute-constructor">
-        <param name="name" type="xs:QName"/>
-        <param name="content" type="xs:anyAtomicType*"/>
-        <return type="node()"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.node.AttributeNodeConstructorScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:text-constructor($content as xs:anyAtomicType*) as node() -->
-    <operator name="opext:text-constructor">
-        <param name="content" type="xs:anyAtomicType*"/>
-        <return type="node()"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.node.TextNodeConstructorScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:document-constructor($content as node()) as node() -->
-    <operator name="opext:document-constructor">
-        <param name="content" type="node()"/>
-        <return type="node()"/>
-    </operator>
-
-    <!-- opext:if-then-else($condition as xs:boolean, $then as item()*, $else as item()*) as item()* -->
-    <operator name="opext:if-then-else">
-        <param name="condition" type="xs:boolean"/>
-        <param name="then" type="item()*"/>
-        <param name="else" type="item()*"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.conditional.IfThenElseScalarEvaluatorFactory"/>
-        <return type="item()*"/>
-    </operator>
-
-    <!-- opext:ancestor($arg as node()*) as node()* -->
-    <operator name="opext:ancestor">
-        <param name="arg" type="node()*"/>
-        <return type="node()*"/>
-    </operator>
-
-    <!-- opext:ancestor-or-self($arg as node()*) as node()* -->
-    <operator name="opext:ancestor-or-self">
-        <param name="arg" type="node()*"/>
-        <return type="node()*"/>
-    </operator>
-
-    <!-- opext:attribute($arg as node()*) as node()* -->
-    <operator name="opext:attribute">
-        <param name="arg" type="node()*"/>
-        <return type="node()*"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.step.AttributePathStepScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:child($arg as node()*) as node()* -->
-    <operator name="opext:child">
-        <param name="arg" type="node()*"/>
-        <return type="node()*"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.step.ChildPathStepScalarEvaluatorFactory"/>
-        <runtime type="unnesting" class="org.apache.vxquery.runtime.functions.step.ChildPathStepUnnestingEvaluatorFactory"/>
-        <property type="DocumentOrder" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-        <property type="UniqueNodes" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-    </operator>
-
-    <!-- opext:descendant($arg as node()*) as node()* -->
-    <operator name="opext:descendant">
-        <param name="arg" type="node()*"/>
-        <return type="node()*"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.step.DescendantPathStepScalarEvaluatorFactory"/>
-        <property type="UniqueNodes" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.uniquenodes.UniqueNodesNOPropagationPolicy"/>
-    </operator>
-
-    <!-- opext:descendant-or-self($arg as node()*) as node()* -->
-    <operator name="opext:descendant-or-self">
-        <param name="arg" type="node()*"/>
-        <return type="node()*"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.step.DescendantOrSelfPathStepScalarEvaluatorFactory"/>
-        <runtime type="unnesting" class="org.apache.vxquery.runtime.functions.step.DescendantOrSelfPathStepUnnestingEvaluatorFactory"/>
-        <property type="UniqueNodes" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.uniquenodes.UniqueNodesNOPropagationPolicy"/>
-    </operator>
-
-    <!-- opext:following($arg as node()*) as node()* -->
-    <operator name="opext:following">
-        <param name="arg" type="node()*"/>
-        <return type="node()*"/>
-    </operator>
-
-    <!-- opext:following-sibling($arg as node()*) as node()* -->
-    <operator name="opext:following-sibling">
-        <param name="arg" type="node()*"/>
-        <return type="node()*"/>
-    </operator>
-
-    <!-- opext:parent($arg as node()*) as node()* -->
-    <operator name="opext:parent">
-        <param name="arg" type="node()*"/>
-        <return type="node()*"/>
-    </operator>
-
-    <!-- opext:preceding($arg as node()*) as node()* -->
-    <operator name="opext:preceding">
-        <param name="arg" type="node()*"/>
-        <return type="node()*"/>
-    </operator>
-
-    <!-- opext:preceding-sibling($arg as node()*) as node()* -->
-    <operator name="opext:preceding-sibling">
-        <param name="arg" type="node()*"/>
-        <return type="node()*"/>
-    </operator>
-
-    <!-- opext:self($arg as node()*) as node()* -->
-    <operator name="opext:self">
-        <param name="arg" type="node()*"/>
-        <return type="node()*"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.step.SelfPathStepScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:sequence($arg as item()*) as item()* -->
-    <operator name="opext:sequence">
-        <param name="arg" type="item()*"/>
-        <return type="item()*"/>
-        <runtime type="aggregate" class="org.apache.vxquery.runtime.functions.sequence.SequenceAggregateEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:iterate($arg as item()*) as item() -->
-    <operator name="opext:iterate">
-        <param name="arg" type="item()*"/>
-        <return type="item()"/>
-        <runtime type="unnesting" class="org.apache.vxquery.runtime.functions.sequence.IterateUnnestingEvaluatorFactory"/>
-        <property type="DocumentOrder" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-        <property type="UniqueNodes" class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
-            <argument value="0"/>
-        </property>
-    </operator>
-
-    <!-- opext:validate-lax($arg as item()*) as item()* -->
-    <operator name="opext:validate-lax">
-        <param name="arg" type="item()*"/>
-        <return type="item()*"/>
-    </operator>
-
-    <!-- opext:validate-strict($arg as item()*) as item()* -->
-    <operator name="opext:validate-strict">
-        <param name="arg" type="item()*"/>
-        <return type="item()*"/>
-    </operator>
-
-    <!-- opext:promote($arg as item()*, $type as xsext:type) as item()* -->
-    <operator name="opext:promote">
-        <param name="arg" type="item()*"/>
-        <param name="type" type="xs:int"/>
-        <return type="item()*"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.type.PromoteScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:treat($arg as item()*, $type as xsext:type) as item()* -->
-    <operator name="opext:treat">
-        <param name="arg" type="item()*"/>
-        <param name="type" type="xs:int"/>
-        <return type="item()*"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.type.TreatScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:cast($arg as item()*, $type as xsext:type) as item()* -->
-    <operator name="opext:cast">
-        <param name="arg" type="item()*"/>
-        <param name="type" type="xs:int"/>
-        <return type="item()*"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.cast.CastScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:castable($arg as item()*, $type as xsext:type) as xs:boolean -->
-    <operator name="opext:castable">
-        <param name="arg" type="item()*"/>
-        <param name="type" type="xs:int"/>
-        <return type="xs:boolean"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.castable.CastableScalarEvaluatorFactory"/>
-    </operator>
-
-    <!-- opext:instance-of($arg as item()*, $type as xsext:type) as xs:boolean -->
-    <operator name="opext:instance-of">
-        <param name="arg" type="item()*"/>
-        <param name="type" type="xs:int"/>
-        <return type="xs:boolean"/>
-        <runtime type="scalar" class="org.apache.vxquery.runtime.functions.type.InstanceOfScalarEvaluatorFactory"/>
-    </operator>
+	<!-- op:add-dayTimeDuration-to-date( $arg1 as xs:date, $arg2 as xs:dayTimeDuration) 
+		as xs:date -->
+	<operator name="op:add-dayTimeDuration-to-date">
+		<param name="arg1" type="xs:date" />
+		<param name="arg2" type="xs:dayTimeDuration" />
+		<return type="xs:date" />
+	</operator>
+
+	<!-- op:add-dayTimeDuration-to-dateTime( $arg1 as xs:dateTime, $arg2 as 
+		xs:dayTimeDuration) as xs:dateTime -->
+	<operator name="op:add-dayTimeDuration-to-dateTime">
+		<param name="arg1" type="xs:dateTime" />
+		<param name="arg2" type="xs:dayTimeDuration" />
+		<return type="xs:dateTime" />
+	</operator>
+
+	<!-- op:add-dayTimeDuration-to-time( $arg1 as xs:time, $arg2 as xs:dayTimeDuration) 
+		as xs:time -->
+	<operator name="op:add-dayTimeDuration-to-time">
+		<param name="arg1" type="xs:time" />
+		<param name="arg2" type="xs:dayTimeDuration" />
+		<return type="xs:time" />
+	</operator>
+
+	<!-- op:add-dayTimeDurations( $arg1 as xs:dayTimeDuration, $arg2 as xs:dayTimeDuration) 
+		as xs:dayTimeDuration -->
+	<operator name="op:add-dayTimeDurations">
+		<param name="arg1" type="xs:dayTimeDuration" />
+		<param name="arg2" type="xs:dayTimeDuration" />
+		<return type="xs:dayTimeDuration" />
+	</operator>
+
+	<!-- op:add-yearMonthDuration-to-date( $arg1 as xs:date, $arg2 as xs:yearMonthDuration) 
+		as xs:date -->
+	<operator name="op:add-yearMonthDuration-to-date">
+		<param name="arg1" type="xs:date" />
+		<param name="arg2" type="xs:yearMonthDuration" />
+		<return type="xs:date" />
+	</operator>
+
+	<!-- op:add-yearMonthDuration-to-dateTime( $arg1 as xs:dateTime, $arg2 as 
+		xs:yearMonthDuration) as xs:dateTime -->
+	<operator name="op:add-yearMonthDuration-to-dateTime">
+		<param name="arg1" type="xs:dateTime" />
+		<param name="arg2" type="xs:yearMonthDuration" />
+		<return type="xs:dateTime" />
+	</operator>
+
+	<!-- op:add-yearMonthDurations( $arg1 as xs:yearMonthDuration, $arg2 as 
+		xs:yearMonthDuration) as xs:yearMonthDuration -->
+	<operator name="op:add-yearMonthDurations">
+		<param name="arg1" type="xs:yearMonthDuration" />
+		<param name="arg2" type="xs:yearMonthDuration" />
+		<return type="xs:yearMonthDuration" />
+	</operator>
+
+	<!-- op:base64Binary-equal( $value1 as xs:base64Binary, $value2 as xs:base64Binary) 
+		as xs:boolean -->
+	<operator name="op:base64Binary-equal">
+		<param name="value1" type="xs:base64Binary" />
+		<param name="value2" type="xs:base64Binary" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:boolean-equal($value1 as xs:boolean, $value2 as xs:boolean) as xs:boolean -->
+	<operator name="op:boolean-equal">
+		<param name="value1" type="xs:boolean" />
+		<param name="value2" type="xs:boolean" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:boolean-greater-than( $arg1 as xs:boolean, $arg2 as xs:boolean) 
+		as xs:boolean -->
+	<operator name="op:boolean-greater-than">
+		<param name="value1" type="xs:boolean" />
+		<param name="value2" type="xs:boolean" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:boolean-less-than( $arg1 as xs:boolean, $arg2 as xs:boolean) as 
+		xs:boolean -->
+	<operator name="op:boolean-less-than">
+		<param name="value1" type="xs:boolean" />
+		<param name="value2" type="xs:boolean" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:concatenate($arg as item()*) as item()* -->
+	<operator name="op:concatenate" varargs="true">
+		<param name="arg" type="item()*" />
+		<return type="item()*" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.sequence.ConcatenateScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- op:date-equal($arg1 as xs:date, $arg2 as xs:date) as xs:boolean -->
+	<operator name="op:date-equal">
+		<param name="arg1" type="xs:date" />
+		<param name="arg2" type="xs:date" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:date-greater-than( $arg1 as xs:date, $arg2 as xs:date) as xs:boolean -->
+	<operator name="op:date-greater-than">
+		<param name="arg1" type="xs:date" />
+		<param name="arg2" type="xs:date" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:date-less-than($arg1 as xs:date, $arg2 as xs:date) as xs:boolean -->
+	<operator name="op:date-less-than">
+		<param name="arg1" type="xs:date" />
+		<param name="arg2" type="xs:date" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:dateTime-equal($arg1 as xs:dateTime, $arg2 as xs:dateTime) as xs:boolean -->
+	<operator name="op:dateTime-equal">
+		<param name="arg1" type="xs:dateTime" />
+		<param name="arg2" type="xs:dateTime" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:dateTime-greater-than( $arg1 as xs:dateTime, $arg2 as xs:dateTime) 
+		as xs:boolean -->
+	<operator name="op:dateTime-greater-than">
+		<param name="arg1" type="xs:dateTime" />
+		<param name="arg2" type="xs:dateTime" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:dateTime-less-than( $arg1 as xs:dateTime, $arg2 as xs:dateTime) 
+		as xs:boolean -->
+	<operator name="op:dateTime-less-than">
+		<param name="arg1" type="xs:dateTime" />
+		<param name="arg2" type="xs:dateTime" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:dayTimeDuration-greater-than( $arg1 as xs:dayTimeDuration, $arg2 
+		as xs:dayTimeDuration) as xs:boolean -->
+	<operator name="op:dayTimeDuration-greater-than">
+		<param name="arg1" type="xs:dayTimeDuration" />
+		<param name="arg2" type="xs:dayTimeDuration" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:dayTimeDuration-less-than( $arg1 as xs:dayTimeDuration, $arg2 as 
+		xs:dayTimeDuration) as xs:boolean -->
+	<operator name="op:dayTimeDuration-less-than">
+		<param name="arg1" type="xs:dayTimeDuration" />
+		<param name="arg2" type="xs:dayTimeDuration" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:divide-dayTimeDuration( $arg1 as xs:dayTimeDuration, $arg2 as xs:double) 
+		as xs:dayTimeDuration -->
+	<operator name="op:divide-dayTimeDuration">
+		<param name="arg1" type="xs:dayTimeDuration" />
+		<param name="arg2" type="xs:double" />
+		<return type="xs:dayTimeDuration" />
+	</operator>
+
+	<!-- op:divide-dayTimeDuration-by-dayTimeDuration( $arg1 as xs:dayTimeDuration, 
+		$arg2 as xs:dayTimeDuration) as xs:decimal -->
+	<operator name="op:divide-dayTimeDuration-by-dayTimeDuration">
+		<param name="arg1" type="xs:dayTimeDuration" />
+		<param name="arg2" type="xs:dayTimeDuration" />
+		<return type="xs:decimal" />
+	</operator>
+
+	<!-- op:divide-yearMonthDuration( $arg1 as xs:yearMonthDuration, $arg2 as 
+		xs:double) as xs:yearMonthDuration -->
+	<operator name="op:divide-yearMonthDuration">
+		<param name="arg1" type="xs:yearMonthDuration" />
+		<param name="arg2" type="xs:double" />
+		<return type="xs:yearMonthDuration" />
+	</operator>
+
+	<!-- op:divide-yearMonthDuration-by-yearMonthDuration( $arg1 as xs:yearMonthDuration, 
+		$arg2 as xs:yearMonthDuration) as xs:decimal -->
+	<operator name="op:divide-yearMonthDuration-by-yearMonthDuration">
+		<param name="arg1" type="xs:yearMonthDuration" />
+		<param name="arg2" type="xs:yearMonthDuration" />
+		<return type="xs:decimal" />
+	</operator>
+
+	<!-- op:duration-equal($arg1 as xs:duration, $arg2 as xs:duration) as xs:boolean -->
+	<operator name="op:duration-equal">
+		<param name="arg1" type="xs:duration" />
+		<param name="arg2" type="xs:duration" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:except($parameter1 as node()*, $parameter2 as node()*) as node()* -->
+	<operator name="op:except">
+		<param name="parameter1" type="node()*" />
+		<param name="parameter2" type="node()*" />
+		<return type="node()*" />
+		<!-- implementation assumes input in document order -->
+		<property type="DocumentOrder"
+			class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
+			<argument value="0" />
+		</property>
+		<property type="UniqueNodes"
+			class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
+			<argument value="0" />
+		</property>
+	</operator>
+
+	<!-- op:gDay-equal($arg1 as xs:gDay, $arg2 as xs:gDay) as xs:boolean -->
+	<operator name="op:gDay-equal">
+		<param name="arg1" type="xs:gDay" />
+		<param name="arg2" type="xs:gDay" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:gMonth-equal($arg1 as xs:gMonth, $arg2 as xs:gMonth) as xs:boolean -->
+	<operator name="op:gMonth-equal">
+		<param name="arg1" type="xs:gMonth" />
+		<param name="arg2" type="xs:gMonth" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:gMonthDay-equal($arg1 as xs:gMonthDay, $arg2 as xs:gMonthDay) as 
+		xs:boolean -->
+	<operator name="op:gMonthDay-equal">
+		<param name="arg1" type="xs:gMonthDay" />
+		<param name="arg2" type="xs:gMonthDay" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:gYear-equal($arg1 as xs:gYear, $arg2 as xs:gYear) as xs:boolean -->
+	<operator name="op:gYear-equal">
+		<param name="arg1" type="xs:gYear" />
+		<param name="arg2" type="xs:gYear" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:gYearMonth-equal( $arg1 as xs:gYearMonth, $arg2 as xs:gYearMonth) 
+		as xs:boolean -->
+	<operator name="op:gYearMonth-equal">
+		<param name="arg1" type="xs:gYearMonth" />
+		<param name="arg2" type="xs:gYearMonth" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:hexBinary-equal($value1 as xs:hexBinary, $value2 as xs:hexBinary) 
+		as xs:boolean -->
+	<operator name="op:hexBinary-equal">
+		<param name="arg1" type="xs:hexBinary" />
+		<param name="arg2" type="xs:hexBinary" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:intersect($parameter1 as node()*, $parameter2 as node()*) as node()* -->
+	<operator name="op:intersect">
+		<param name="parameter1" type="node()*" />
+		<param name="parameter2" type="node()*" />
+		<return type="node()*" />
+		<!-- implementation assumes input in document order -->
+		<property type="DocumentOrder"
+			class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
+			<argument value="0" />
+		</property>
+		<property type="UniqueNodes"
+			class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
+			<argument value="0" />
+		</property>
+	</operator>
+
+	<!-- op:is-same-node($parameter1 as node(), $parameter2 as node()) as xs:boolean -->
+	<operator name="op:is-same-node">
+		<param name="parameter1" type="node()" />
+		<param name="parameter2" type="node()" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:multiply-dayTimeDuration( $arg1 as xs:dayTimeDuration, $arg2 as 
+		xs:double) as xs:dayTimeDuration -->
+	<operator name="op:multiply-dayTimeDuration">
+		<param name="arg1" type="xs:dayTimeDuration" />
+		<param name="arg2" type="xs:double" />
+		<return type="xs:dayTimeDuration" />
+	</operator>
+
+	<!-- op:multiply-yearMonthDuration( $arg1 as xs:yearMonthDuration, $arg2 
+		as xs:double) as xs:yearMonthDuration -->
+	<operator name="op:multiply-yearMonthDuration">
+		<param name="arg1" type="xs:yearMonthDuration" />
+		<param name="arg2" type="xs:double" />
+		<return type="xs:yearMonthDuration" />
+	</operator>
+
+	<!-- op:node-after($parameter1 as node(), $parameter2 as node()) as xs:boolean -->
+	<operator name="op:node-after">
+		<param name="parameter1" type="node()" />
+		<param name="parameter2" type="node()" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.node.OpNodeAfterEvaluatorFactory" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:node-before($parameter1 as node(), $parameter2 as node()) as xs:boolean -->
+	<operator name="op:node-before">
+		<param name="parameter1" type="node()" />
+		<param name="parameter2" type="node()" />
+		<return type="xs:boolean" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.node.OpNodeBeforeEvaluatorFactory" />
+	</operator>
+
+	<!-- op:NOTATION-equal($arg1 as xs:NOTATION, $arg2 as xs:NOTATION) as xs:boolean -->
+	<operator name="op:NOTATION-equal">
+		<param name="arg1" type="xs:NOTATION" />
+		<param name="arg2" type="xs:NOTATION" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:numeric-add($arg1 as numeric, $arg2 as numeric) as numeric -->
+	<operator name="op:numeric-add">
+		<param name="arg1" type="xsext:numeric" />
+		<param name="arg2" type="xsext:numeric" />
+		<return type="xsext:numeric" />
+	</operator>
+
+	<!-- op:numeric-divide($arg1 as numeric, $arg2 as numeric) as numeric -->
+	<operator name="op:numeric-divide">
+		<param name="arg1" type="xsext:numeric" />
+		<param name="arg2" type="xsext:numeric" />
+		<return type="xsext:numeric" />
+	</operator>
+
+	<!-- op:numeric-equal($arg1 as numeric, $arg2 as numeric) as xs:boolean -->
+	<operator name="op:numeric-equal">
+		<param name="arg1" type="xsext:numeric" />
+		<param name="arg2" type="xsext:numeric" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:numeric-greater-than( $arg1 as numeric, $arg2 as numeric) as xs:boolean -->
+	<operator name="op:numeric-greater-than">
+		<param name="arg1" type="xsext:numeric" />
+		<param name="arg2" type="xsext:numeric" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:numeric-integer-divide( $arg1 as numeric, $arg2 as numeric) as xs:integer -->
+	<operator name="op:numeric-integer-divide">
+		<param name="arg1" type="xsext:numeric" />
+		<param name="arg2" type="xsext:numeric" />
+		<return type="xs:integer" />
+	</operator>
+
+	<!-- op:numeric-less-than( $arg1 as numeric, $arg2 as numeric) as xs:boolean -->
+	<operator name="op:numeric-less-than">
+		<param name="arg1" type="xsext:numeric" />
+		<param name="arg2" type="xsext:numeric" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:numeric-mod($arg1 as numeric, $arg2 as numeric) as numeric -->
+	<operator name="op:numeric-mod">
+		<param name="arg1" type="xsext:numeric" />
+		<param name="arg2" type="xsext:numeric" />
+		<return type="xsext:numeric" />
+	</operator>
+
+	<!-- op:numeric-multiply( $arg1 as numeric, $arg2 as numeric) as numeric -->
+	<operator name="op:numeric-multiply">
+		<param name="arg1" type="xsext:numeric" />
+		<param name="arg2" type="xsext:numeric" />
+		<return type="xsext:numeric" />
+	</operator>
+
+	<!-- op:numeric-subtract( $arg1 as numeric, $arg2 as numeric) as numeric -->
+	<operator name="op:numeric-subtract">
+		<param name="arg1" type="xsext:numeric" />
+		<param name="arg2" type="xsext:numeric" />
+		<return type="xsext:numeric" />
+	</operator>
+
+	<!-- op:numeric-unary-minus( $arg as numeric) as numeric -->
+	<operator name="op:numeric-unary-minus">
+		<param name="arg1" type="xsext:numeric" />
+		<return type="xsext:numeric" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.unary.NumericUnaryMinusScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- op:numeric-unary-plus( $arg as numeric) as numeric -->
+	<operator name="op:numeric-unary-plus">
+		<param name="arg1" type="xsext:numeric" />
+		<return type="xsext:numeric" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.unary.NumericUnaryPlusScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- op:QName-equal($arg1 as xs:QName, $arg2 as xs:QName) as xs:boolean -->
+	<operator name="op:QName-equal">
+		<param name="arg1" type="xs:QName" />
+		<param name="arg2" type="xs:QName" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:subtract-dates($arg1 as xs:date, $arg2 as xs:date) as xs:dayTimeDuration? -->
+	<operator name="op:subtract-dates">
+		<param name="arg1" type="xs:date" />
+		<param name="arg2" type="xs:date" />
+		<return type="xs:dayTimeDuration?" />
+	</operator>
+
+	<!-- op:subtract-dateTimes( $arg1 as xs:dateTime, $arg2 as xs:dateTime) 
+		as xs:dayTimeDuration? -->
+	<operator name="op:subtract-dateTimes">
+		<param name="arg1" type="xs:dateTime" />
+		<param name="arg2" type="xs:dateTime" />
+		<return type="xs:dayTimeDuration?" />
+	</operator>
+
+	<!-- op:subtract-dayTimeDuration-from-date( $arg1 as xs:date, $arg2 as xs:dayTimeDuration) 
+		as xs:date -->
+	<operator name="op:subtract-dayTimeDuration-from-date">
+		<param name="arg1" type="xs:date" />
+		<param name="arg2" type="xs:dayTimeDuration" />
+		<return type="xs:date" />
+	</operator>
+
+	<!-- op:subtract-dayTimeDuration-from-dateTime( $arg1 as xs:dateTime, $arg2 
+		as xs:dayTimeDuration) as xs:dateTime -->
+	<operator name="op:subtract-dayTimeDuration-from-dateTime">
+		<param name="arg1" type="xs:dateTime" />
+		<param name="arg2" type="xs:dayTimeDuration" />
+		<return type="xs:dateTime" />
+	</operator>
+
+	<!-- op:subtract-dayTimeDuration-from-time( $arg1 as xs:time, $arg2 as xs:dayTimeDuration) 
+		as xs:time -->
+	<operator name="op:subtract-dayTimeDuration-from-time">
+		<param name="arg1" type="xs:time" />
+		<param name="arg2" type="xs:dayTimeDuration" />
+		<return type="xs:time" />
+	</operator>
+
+	<!-- op:subtract-dayTimeDurations( $arg1 as xs:dayTimeDuration, $arg2 as 
+		xs:dayTimeDuration) as xs:dayTimeDuration -->
+	<operator name="op:subtract-dayTimeDurations">
+		<param name="arg1" type="xs:dayTimeDuration" />
+		<param name="arg2" type="xs:dayTimeDuration" />
+		<return type="xs:dayTimeDuration" />
+	</operator>
+
+	<!-- op:subtract-times($arg1 as xs:time, $arg2 as xs:time) as xs:dayTimeDuration -->
+	<operator name="op:subtract-times">
+		<param name="arg1" type="xs:time" />
+		<param name="arg2" type="xs:time" />
+		<return type="xs:dayTimeDuration" />
+	</operator>
+
+	<!-- op:subtract-yearMonthDuration-from-date( $arg1 as xs:date, $arg2 as 
+		xs:yearMonthDuration) as xs:date -->
+	<operator name="op:subtract-yearMonthDuration-from-date">
+		<param name="arg1" type="xs:date" />
+		<param name="arg2" type="xs:yearMonthDuration" />
+		<return type="xs:date" />
+	</operator>
+
+	<!-- op:subtract-yearMonthDuration-from-dateTime( $arg1 as xs:dateTime, 
+		$arg2 as xs:yearMonthDuration) as xs:dateTime -->
+	<operator name="op:subtract-yearMonthDuration-from-dateTime">
+		<param name="arg1" type="xs:dateTime" />
+		<param name="arg2" type="xs:yearMonthDuration" />
+		<return type="xs:dateTime" />
+	</operator>
+
+	<!-- op:subtract-yearMonthDurations( $arg1 as xs:yearMonthDuration, $arg2 
+		as xs:yearMonthDuration) as xs:yearMonthDuration -->
+	<operator name="op:subtract-yearMonthDurations">
+		<param name="arg1" type="xs:yearMonthDuration" />
+		<param name="arg2" type="xs:yearMonthDuration" />
+		<return type="xs:yearMonthDuration" />
+	</operator>
+
+	<!-- op:time-equal($arg1 as xs:time, $arg2 as xs:time) as xs:boolean -->
+	<operator name="op:time-equal">
+		<param name="arg1" type="xs:time" />
+		<param name="arg2" type="xs:time" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:time-greater-than( $arg1 as xs:time, $arg2 as xs:time) as xs:boolean -->
+	<operator name="op:time-greater-than">
+		<param name="arg1" type="xs:time" />
+		<param name="arg2" type="xs:time" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:time-less-than($arg1 as xs:time, $arg2 as xs:time) as xs:boolean -->
+	<operator name="op:time-less-than">
+		<param name="arg1" type="xs:time" />
+		<param name="arg2" type="xs:time" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:to($firstval as xs:integer, $lastval as xs:integer) as xs:integer* -->
+	<operator name="op:to">
+		<param name="firstval" type="xs:integer" />
+		<param name="lastval" type="xs:integer" />
+		<return type="xs:integer*" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.sequence.OpToScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- op:union($parameter1 as node()*, $parameter2 as node()*) as node()* -->
+	<operator name="op:union">
+		<param name="parameter1" type="node()*" />
+		<param name="parameter2" type="node()*" />
+		<return type="node()*" />
+		<!-- as we do the doc-order-sort and the duplicate elimination -->
+		<!-- after the concatenation, we can reuse the concat iterator -->
+		<property type="DocumentOrder"
+			class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
+			<argument value="0" />
+		</property>
+		<property type="UniqueNodes"
+			class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
+			<argument value="0" />
+		</property>
+	</operator>
+
+	<!-- op:yearMonthDuration-greater-than( $arg1 as xs:yearMonthDuration, $arg2 
+		as xs:yearMonthDuration) as xs:boolean -->
+	<operator name="op:yearMonthDuration-greater-than">
+		<param name="arg1" type="xs:yearMonthDuration" />
+		<param name="arg2" type="xs:yearMonthDuration" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- op:yearMonthDuration-less-than( $arg1 as xs:yearMonthDuration, $arg2 
+		as xs:yearMonthDuration) as xs:boolean -->
+	<operator name="op:yearMonthDuration-less-than">
+		<param name="arg1" type="xs:yearMonthDuration" />
+		<param name="arg2" type="xs:yearMonthDuration" />
+		<return type="xs:boolean" />
+	</operator>
+
+	<!-- fn:avg-local($arg as xs:anyAtomicType*) as xs:anyAtomicType? -->
+	<operator name="opext:avg-local">
+		<param name="arg" type="xs:anyAtomicType*" />
+		<return type="xs:anyAtomicType?" />
+		<runtime type="aggregate"
+			class="org.apache.vxquery.runtime.functions.aggregate.AvgLocalAggregateEvaluatorFactory" />
+	</operator>
+
+	<!-- fn:avg-global($arg as xs:anyAtomicType*) as xs:anyAtomicType? -->
+	<operator name="opext:avg-global">
+		<param name="arg" type="xs:anyAtomicType*" />
+		<return type="xs:anyAtomicType?" />
+		<runtime type="aggregate"
+			class="org.apache.vxquery.runtime.functions.aggregate.AvgGlobalAggregateEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:ordered($arg as item()*) as item()* -->
+	<operator name="opext:ordered">
+		<param name="arg" type="item()*" />
+		<return type="item()*" />
+	</operator>
+
+	<!-- opext:unordered($arg as item()*) as item()* -->
+	<operator name="opext:unordered">
+		<param name="arg" type="item()*" />
+		<return type="item()*" />
+	</operator>
+
+	<!-- opext:value-eq($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) 
+		as xs:boolean? -->
+	<operator name="opext:value-eq">
+		<param name="arg1" type="xs:anyAtomicType?" />
+		<param name="arg2" type="xs:anyAtomicType?" />
+		<return type="xs:boolean?" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.comparison.ValueEqComparisonScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:value-ne($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) 
+		as xs:boolean? -->
+	<operator name="opext:value-ne">
+		<param name="arg1" type="xs:anyAtomicType?" />
+		<param name="arg2" type="xs:anyAtomicType?" />
+		<return type="xs:boolean?" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.comparison.ValueNeComparisonScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:value-lt($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) 
+		as xs:boolean? -->
+	<operator name="opext:value-lt">
+		<param name="arg1" type="xs:anyAtomicType?" />
+		<param name="arg2" type="xs:anyAtomicType?" />
+		<return type="xs:boolean?" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.comparison.ValueLtComparisonScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:value-le($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) 
+		as xs:boolean? -->
+	<operator name="opext:value-le">
+		<param name="arg1" type="xs:anyAtomicType?" />
+		<param name="arg2" type="xs:anyAtomicType?" />
+		<return type="xs:boolean?" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.comparison.ValueLeComparisonScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:value-gt($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) 
+		as xs:boolean? -->
+	<operator name="opext:value-gt">
+		<param name="arg1" type="xs:anyAtomicType?" />
+		<param name="arg2" type="xs:anyAtomicType?" />
+		<return type="xs:boolean?" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.comparison.ValueGtComparisonScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:value-ge($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) 
+		as xs:boolean? -->
+	<operator name="opext:value-ge">
+		<param name="arg1" type="xs:anyAtomicType?" />
+		<param name="arg2" type="xs:anyAtomicType?" />
+		<return type="xs:boolean?" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.comparison.ValueGeComparisonScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:general-eq($arg1 as item()*, $arg2 as item()*) as xs:boolean -->
+	<operator name="opext:general-eq">
+		<param name="arg1" type="item()*" />
+		<param name="arg2" type="item()*" />
+		<return type="xs:boolean" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.comparison.general.GeneralEqComparisonScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:general-ne($arg1 as item()*, $arg2 as item()*) as xs:boolean -->
+	<operator name="opext:general-ne">
+		<param name="arg1" type="item()*" />
+		<param name="arg2" type="item()*" />
+		<return type="xs:boolean" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.comparison.general.GeneralNeComparisonScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:general-lt($arg1 as item()*, $arg2 as item()*) as xs:boolean -->
+	<operator name="opext:general-lt">
+		<param name="arg1" type="item()*" />
+		<param name="arg2" type="item()*" />
+		<return type="xs:boolean" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.comparison.general.GeneralLtComparisonScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:general-le($arg1 as item()*, $arg2 as item()*) as xs:boolean -->
+	<operator name="opext:general-le">
+		<param name="arg1" type="item()*" />
+		<param name="arg2" type="item()*" />
+		<return type="xs:boolean" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.comparison.general.GeneralLeComparisonScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:general-gt($arg1 as item()*, $arg2 as item()*) as xs:boolean -->
+	<operator name="opext:general-gt">
+		<param name="arg1" type="item()*" />
+		<param name="arg2" type="item()*" />
+		<return type="xs:boolean" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.comparison.general.GeneralGtComparisonScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:general-ge($arg1 as item()*, $arg2 as item()*) as xs:boolean -->
+	<operator name="opext:general-ge">
+		<param name="arg1" type="item()*" />
+		<param name="arg2" type="item()*" />
+		<return type="xs:boolean" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.comparison.general.GeneralGeComparisonScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:add($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) as 
+		xs:anyAtomicType? -->
+	<operator name="opext:add">
+		<param name="arg1" type="xs:anyAtomicType?" />
+		<param name="arg2" type="xs:anyAtomicType?" />
+		<return type="xs:anyAtomicType?" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.arithmetic.AddScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:subtract($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) 
+		as xs:anyAtomicType? -->
+	<operator name="opext:subtract">
+		<param name="arg1" type="xs:anyAtomicType?" />
+		<param name="arg2" type="xs:anyAtomicType?" />
+		<return type="xs:anyAtomicType?" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.arithmetic.SubtractScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:multiply($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) 
+		as xs:anyAtomicType? -->
+	<operator name="opext:multiply">
+		<param name="arg1" type="xs:anyAtomicType?" />
+		<param name="arg2" type="xs:anyAtomicType?" />
+		<return type="xs:anyAtomicType?" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.arithmetic.MultiplyScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:divide($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) 
+		as xs:anyAtomicType? -->
+	<operator name="opext:divide">
+		<param name="arg1" type="xs:anyAtomicType?" />
+		<param name="arg2" type="xs:anyAtomicType?" />
+		<return type="xs:anyAtomicType?" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.arithmetic.DivideScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:idiv($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) 
+		as xs:anyAtomicType? -->
+	<operator name="opext:idiv">
+		<param name="arg1" type="xsext:numeric?" />
+		<param name="arg2" type="xsext:numeric?" />
+		<return type="xs:integer?" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.arithmetic.IntegerDivideScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:mod($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?) as 
+		xs:anyAtomicType? -->
+	<operator name="opext:mod">
+		<param name="arg1" type="xsext:numeric?" />
+		<param name="arg2" type="xsext:numeric?" />
+		<return type="xs:integer?" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.arithmetic.ModScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:and($arg1 as xs:boolean?, $arg2 as xs:boolean?) as xs:boolean? -->
+	<operator name="opext:and">
+		<param name="arg1" type="xs:boolean?" />
+		<param name="arg2" type="xs:boolean?" />
+		<return type="xs:boolean?" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.bool.AndScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:or($arg1 as xs:boolean?, $arg2 as xs:boolean?) as xs:boolean? -->
+	<operator name="opext:or">
+		<param name="arg1" type="xs:boolean?" />
+		<param name="arg2" type="xs:boolean?" />
+		<return type="xs:boolean?" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.bool.OrScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:sort-nodes-asc($arg as node()*) as node()* -->
+	<operator name="opext:sort-nodes-asc">
+		<param name="arg" type="node()*" />
+		<return type="node()*" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.nodeid.SortDistinctNodesAscOrAtomicsScalarEvaluatorFactory" />
+		<property type="UniqueNodes"
+			class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
+			<argument value="0" />
+		</property>
+	</operator>
+
+	<!-- opext:sort-nodes-asc-or-atomics($arg as item()*) as item()* -->
+	<operator name="opext:sort-nodes-asc-or-atomics">
+		<param name="arg" type="item()*" />
+		<return type="item()*" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.nodeid.SortDistinctNodesAscOrAtomicsScalarEvaluatorFactory" />
+		<property type="UniqueNodes"
+			class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
+			<argument value="0" />
+		</property>
+	</operator>
+
+	<!-- opext:sort-distinct-nodes-asc($arg as node()*) as node()* -->
+	<operator name="opext:sort-distinct-nodes-asc">
+		<param name="arg" type="node()*" />
+		<return type="node()*" />
+		<property type="UniqueNodes"
+			class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
+			<argument value="0" />
+		</property>
+	</operator>
+
+	<!-- opext:sort-distinct-nodes-asc-or-atomics($arg as item()*) as item()* -->
+	<operator name="opext:sort-distinct-nodes-asc-or-atomics">
+		<param name="arg" type="item()*" />
+		<return type="item()*" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.nodeid.SortDistinctNodesAscOrAtomicsScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:distinct-nodes-or-atomics($arg as item()*) as item()* -->
+	<operator name="opext:distinct-nodes-or-atomics">
+		<param name="arg" type="item()*" />
+		<return type="item()*" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.nodeid.SortDistinctNodesAscOrAtomicsScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:sort-nodes-desc($arg as node()*) as node()* -->
+	<operator name="opext:sort-nodes-desc">
+		<param name="arg" type="node()*" />
+		<return type="node()*" />
+		<property type="UniqueNodes"
+			class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
+			<argument value="0" />
+		</property>
+	</operator>
+
+	<!-- opext:sort-nodes-desc-or-atomics($arg as item()*) as item()* -->
+	<operator name="opext:sort-nodes-desc-or-atomics">
+		<param name="arg" type="item()*" />
+		<return type="item()*" />
+		<property type="UniqueNodes"
+			class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
+			<argument value="0" />
+		</property>
+	</operator>
+
+	<!-- opext:sort-distinct-nodes-desc($arg as node()*) as node()* -->
+	<operator name="opext:sort-distinct-nodes-desc">
+		<param name="arg" type="node()*" />
+		<return type="node()*" />
+	</operator>
+
+	<!-- opext:sort-distinct-nodes-desc-or-atomics($arg as item()*) as item()* -->
+	<operator name="opext:sort-distinct-nodes-desc-or-atomics">
+		<param name="arg" type="item()*" />
+		<return type="item()*" />
+	</operator>
+
+	<!-- opext:id-from-node($arg as item()) as xs:integer -->
+	<operator name="opext:id-from-node">
+		<param name="arg" type="item()" />
+		<return type="xs:integer" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.node.IdFromNodeScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:local-id-from-node($arg as item()) as xs:int -->
+	<operator name="opext:local-id-from-node">
+		<param name="arg" type="item()" />
+		<return type="xs:int" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.node.LocalIdFromNodeScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:tree-id-from-node($arg as item()) as xs:int -->
+	<operator name="opext:tree-id-from-node">
+		<param name="arg" type="item()" />
+		<return type="xs:int" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.node.TreeIdFromNodeScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:deflate-sequences($arg as item()*) as item()* -->
+	<operator name="opext:deflate-sequences">
+		<param name="arg" type="item()*" />
+		<return type="item()*" />
+		<property type="DocumentOrder"
+			class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
+			<argument value="0" />
+		</property>
+		<property type="UniqueNodes"
+			class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
+			<argument value="0" />
+		</property>
+	</operator>
+
+	<!-- opext:pi-constructor($target as xs:sring, $content as xs:string) as 
+		node() -->
+	<operator name="opext:pi-constructor">
+		<param name="target" type="xs:string" />
+		<param name="content" type="xs:string" />
+		<return type="node()" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.node.PINodeConstructorScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:comment-constructor($content as xs:string) as node() -->
+	<operator name="opext:comment-constructor">
+		<param name="content" type="xs:string" />
+		<return type="node()" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.node.CommentNodeConstructorScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:element-constructor($name as xs:QName, $content as item()*) as 
+		node() -->
+	<operator name="opext:element-constructor">
+		<param name="name" type="xs:QName" />
+		<param name="content" type="item()*" />
+		<return type="node()" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.node.ElementNodeConstructorScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:array-constructor($expression as node()) as node() -->
+	<operator name="opext:array-constructor">
+		<param name="expession" type="node()" />
+		<return type="node()" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.node.ArrayNodeConstructorScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:attribute-constructor($name as xs:QName, $content as xs:anyAtomicType*) 
+		as node() -->
+	<operator name="opext:attribute-constructor">
+		<param name="name" type="xs:QName" />
+		<param name="content" type="xs:anyAtomicType*" />
+		<return type="node()" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.node.AttributeNodeConstructorScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:text-constructor($content as xs:anyAtomicType*) as node() -->
+	<operator name="opext:text-constructor">
+		<param name="content" type="xs:anyAtomicType*" />
+		<return type="node()" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.node.TextNodeConstructorScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:document-constructor($content as node()) as node() -->
+	<operator name="opext:document-constructor">
+		<param name="content" type="node()" />
+		<return type="node()" />
+	</operator>
+
+	<!-- opext:if-then-else($condition as xs:boolean, $then as item()*, $else 
+		as item()*) as item()* -->
+	<operator name="opext:if-then-else">
+		<param name="condition" type="xs:boolean" />
+		<param name="then" type="item()*" />
+		<param name="else" type="item()*" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.conditional.IfThenElseScalarEvaluatorFactory" />
+		<return type="item()*" />
+	</operator>
+
+	<!-- opext:ancestor($arg as node()*) as node()* -->
+	<operator name="opext:ancestor">
+		<param name="arg" type="node()*" />
+		<return type="node()*" />
+	</operator>
+
+	<!-- opext:ancestor-or-self($arg as node()*) as node()* -->
+	<operator name="opext:ancestor-or-self">
+		<param name="arg" type="node()*" />
+		<return type="node()*" />
+	</operator>
+
+	<!-- opext:attribute($arg as node()*) as node()* -->
+	<operator name="opext:attribute">
+		<param name="arg" type="node()*" />
+		<return type="node()*" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.step.AttributePathStepScalarEvaluatorFactory" />
+	</operator>
+
+	<!-- opext:child($arg as node()*) as node()* -->
+	<operator name="opext:child">
+		<param name="arg" type="node()*" />
+		<return type="node()*" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.step.ChildPathStepScalarEvaluatorFactory" />
+		<runtime type="unnesting"
+			class="org.apache.vxquery.runtime.functions.step.ChildPathStepUnnestingEvaluatorFactory" />
+		<property type="DocumentOrder"
+			class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
+			<argument value="0" />
+		</property>
+		<property type="UniqueNodes"
+			class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.InputPropertyPropagationPolicy">
+			<argument value="0" />
+		</property>
+	</operator>
+
+	<!-- opext:descendant($arg as node()*) as node()* -->
+	<operator name="opext:descendant">
+		<param name="arg" type="node()*" />
+		<return type="node()*" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.step.DescendantPathStepScalarEvaluatorFactory" />
+		<property type="UniqueNodes"
+			class="org.apache.vxquery.compiler.rewriter.rules.propagationpolicies.uniquenodes.UniqueNodesNOPropagationPolicy" />
+	</operator>
+
+	<!-- opext:descendant-or-self($arg as node()*) as node()* -->
+	<operator name="opext:descendant-or-self">
+		<param name="arg" type="node()*" />
+		<return type="node()*" />
+		<runtime type="scalar"
+			class="org.apache.vxquery.runtime.functions.step.DescendantOrSelfPathStepScalarEvaluatorFactory" />
+		<runtime type="unnesting"
+			class="org.apache.vxquery.runtime.functions.step.DescendantOrSelfPathStepUnnestingEvaluatorFactory" />
+		<property type="UniqueNodes"
+			class="org.apache.vxquery.compiler.rewri

<TRUNCATED>