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Posted to users@jena.apache.org by Dick Murray <da...@gmail.com> on 2013/06/18 15:22:03 UTC
Dynamic graph/model inference within a select.
Hi.
Is it possible to get at the graph i.e. the ?g (specifically the returned
nodes) when the following query is executed?
SELECT *
WHERE
{ { ?g <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <
http://www.unit4.com/daas/graph#Graph> }
GRAPH ?g
{ ?s ?p ?o }
}
When the result is instantiated I want to return the ?g as an RDFS
infmodel. Ideally I want to decide what to return based on the ?g. I've
traced the execSelect() and the ResultSetMem() but drew a blank as to where
I can get at the ?g's!
The following allows me to wrap the returned graph but this is static i.e.
I need to know the ?g's to generate the dgm to pass to the
QueryExecutionFactory.
dataset.begin(ReadWrite.READ);
DatasetGraphMap dgm = new DatasetGraphMap(dataset.asDatasetGraph()) {
@Override
public Graph getGraph(Node graphNode) {
Graph g = super.getGraph(graphNode);
if (graphNode.getURI().equals(types.getURI())) {
g = asRDFS(g);
}
return g;
}
public Graph asRDFS(Graph g) {
return
ModelFactory.createRDFSModel(ModelFactory.createModelForGraph(g)).getGraph();
}
};
Graph g = dgm.getGraph(types.asNode());
info(g.size());
dataset.end();
For the following triples loaded in the default graph;
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix graph: <http://www.unit4.com/daas/graph#>.
@prefix graphs: <http://www.unit4.com/daas/graphs/>.
graph:Graph
rdf:type rdfs:Class.
graphs:g1
rdf:type graph:Graph.
and these loaded in a named graph <http://www.unit4.com/daas/graphs/g1>;
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix graph: <http://www.unit4.com/daas/graph#>.
@prefix graphs: <http://www.unit4.com/daas/graphs/>.
graphs:g1
rdfs:label "Graph 1".
A select returns;
select * where {{ ?g a <http://www.unit4.com/daas/graph#Graph> }. graph ?g
{?s ?p ?o}}
--------------------------------------------------------------------------------------------------------------------------------------------
| g | s
| p | o |
============================================================================================================================================
| <http://www.unit4.com/daas/graphs/g1> | <
http://www.unit4.com/daas/graphs/g1> | <
http://www.w3.org/2000/01/rdf-schema#label> | "Graph 1" |
--------------------------------------------------------------------------------------------------------------------------------------------
What I want is for it to return about 40 more... :-)
Re: Dynamic graph/model inference within a select.
Posted by Dick Murray <da...@gmail.com>.
Hi Andy.
The following CME (sorry it's messy) does what I want but are you saying it
might not based on something now or in the future..? :-)
I create a tdb dataset load some triples into the default graph and the
same triples into named graphs g1 and g2. I wrap the dataset in a
datasetgraphmap and overload getGraph to return a RDFS model created by
wrapping the super.getGraph if the graphNode equals g1.
This works and I get the following...
package JenaInf;
import com.hp.hpl.jena.graph.Graph;
import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.query.Dataset;
import com.hp.hpl.jena.query.DatasetFactory;
import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.ReadWrite;
import com.hp.hpl.jena.query.ResultSetFormatter;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.rdf.model.Resource;
import com.hp.hpl.jena.rdf.model.ResourceFactory;
import com.hp.hpl.jena.sparql.core.DatasetGraphMap;
import com.hp.hpl.jena.tdb.TDBFactory;
import com.hp.hpl.jena.util.FileManager;
import com.hp.hpl.jena.vocabulary.RDFS;
public class TDBInf {
static final String graphNS = "http://example.org/graph#";
static final Resource graphGraph = ResourceFactory.createResource(graphNS +
"Graph");
static final String graphsNS = "http://example.org/graphs/";
static final String g1URI = graphsNS + "g1";
static final String g2URI = graphsNS + "g2";
static final String SELECT_ALL = "select * where {graph ?g {?s ?p ?o}}";
static final String CONSTRUCT_ALL = "construct where {?s ?p ?o}";
static final String SELECT_VIA_GRAPHS = String.format("select * where {{ ?g
a <%s> }. graph ?g {<%s> ?p ?o}}", graphGraph.getURI(), "
http://example.org/trek/Triton");
static final Dataset dataset = TDBFactory.createDataset();
static void init() {
dataset.begin(ReadWrite.WRITE);
FileManager.get().readModel(dataset.getDefaultModel(),
"/home/dick/git/Unit4/U4DaaS/test/JenaInf/Inftest.text", "Turtle");
FileManager.get().readModel(dataset.getNamedModel(g1URI),
"/home/dick/git/Unit4/U4DaaS/test/JenaInf/InfTestG1.text", "Turtle");
FileManager.get().readModel(dataset.getNamedModel(g2URI),
"/home/dick/git/Unit4/U4DaaS/test/JenaInf/InfTestG1.text", "Turtle");
dataset.commit();
}
static void select(Dataset dataset, String select) {
info(select);
if (dataset.supportsTransactions()) {
dataset.begin(ReadWrite.READ);
}
Query query = QueryFactory.create(select);
info(ResultSetFormatter.asText(QueryExecutionFactory.create(select,
dataset).execSelect()));
if (dataset.supportsTransactions()) {
dataset.end();
}
}
static void construct(Dataset dataset, String query) {
info(query);
dataset.begin(ReadWrite.READ);
QueryExecutionFactory.create(query,
dataset).execConstruct().write(System.out, "TTL");
dataset.end();
}
static Dataset infWrap(Dataset dataset) {
dataset.begin(ReadWrite.READ);
DatasetGraphMap dgm = new DatasetGraphMap(dataset.asDatasetGraph()) {
@Override
public Graph getGraph(Node graphNode) {
Graph g = super.getGraph(graphNode);
if (g != null && graphNode.getURI().equals(g1URI)) {
g =
ModelFactory.createRDFSModel(ModelFactory.createModelForGraph(g)).getGraph();
}
return g;
}
};
dataset.end();
return DatasetFactory.create(dgm);
}
/**
* @param args
*/
public static void main(String[] args) {
init();
select(dataset, SELECT_VIA_GRAPHS);
select(infWrap(dataset), SELECT_VIA_GRAPHS);
}
static void info(final Object text) {
System.out.println(String.format("%s", text));
}
}
inftest.text
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix graph: <http://example.org/graph#>.
@prefix graphs: <http://example.org/graphs/>.
graph:Graph
rdf:type rdfs:Class.
graphs:g1
rdf:type graph:Graph.
graphs:g2
rdf:type graph:Graph.
graphs:g3
rdf:type graph:Graph.
inftestg1.text
On 19 June 2013 12:20, Andy Seaborne <an...@apache.org> wrote:
> On 18/06/13 18:22, Dick Murray wrote:
>
>> I'm looking for dynamic inference based on the select. Given a dataset
>> with
>> multiple named graphs I would like the ability to wrap specific named
>> graphs based on some form of filter when the select is processed.
>>
>
> The dataset being queried can not be manipulated during the query.
>
> Whether getGraph is called is evaluator dependent (it's not in TDB which
> works on quads).
>
> There is no guarantee a query is executed in a particular order. It coudl
> do the GRAPH bit before the dft graph access. Currently, that unlikely,
> but there is no guarantee. Oh - and it may happen twice for rewritten
> queries (equality optimizations like to generate multiple more grounded
> accesses).
>
>
> Given the dataset D which contains the named graphs G1, G2, G3 I would
>> like
>> G2 to be returned with RDFS inference if it is queried in a select. I have
>> achieved this by wrapping the graph as an InfModel and using a
>> DatasetGraphMap but this requires that the graph be known before the
>> select
>> is executed. What I'm trying to find (if it exists) is the point during
>> the
>> select processing when the graph is identified and used? Does this exist
>> in
>> a TDB Dataset or is it just a set of quads?
>>
>
> Such a point exists (OpExecutor.execute(OpGraph)) but because of
> optimization and/or converting to quads.
>
> A TDB datsegraph is a set of triples (dft graph) + a set of quads (named
> graphs). Full quad based optimization isn't really done currently but it
> will be in future so any internal approach is going to be vulnerable to
> changes.
>
> I think you need a 2-phase approach.
>
> Phase-1 is setup - query the data and determine which graphs to add
> inference to.
>
> Phase-2 : Build a new datasetgraph and then query that for the real
> answers.
>
> Maybe that's what you are doing. If you query dgm I'd expect to see the
> RDFS inferences but it does not show where you issue the query. Complete,
> minimal example?
>
> Andy
>
>
>> Dick.
>>
>>
>> On 18 June 2013 16:01, Andy Seaborne <an...@apache.org> wrote:
>>
>> Dick,
>>>
>>> I'm not completely sure what you're trying to do - a complete minimal
>>> example showing how they bits and pieces fit together would be good. It
>>> seems to be querying the dataset without the inference graph. I don't
>>> see
>>> where you query the dataset (and which one)
>>>
>>> if (graphNode.getURI().equals(****types.getURI())) {
>>>>
>>>
>>> if (graphNode.equals(types.****asNode()) {
>>>
>>>
>>>
>>>
>>> On 18/06/13 14:22, Dick Murray wrote:
>>>
>>> Hi.
>>>>
>>>> Is it possible to get at the graph i.e. the ?g (specifically the
>>>> returned
>>>> nodes) when the following query is executed?
>>>>
>>>>
>>> Yes - getGraph / getNamedModel depending on which level your working at.
>>>
>>>
>>> SELECT *
>>>
>>>> WHERE
>>>> { { ?g <http://www.w3.org/1999/02/22-****rdf-syntax-ns#type<http://www.w3.org/1999/02/22-**rdf-syntax-ns#type>
>>>> <http://**www.w3.org/1999/02/22-rdf-**syntax-ns#type<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
>>>> >>
>>>> <
>>>> http://www.unit4.com/daas/****graph#Graph<http://www.unit4.com/daas/**graph#Graph>
>>>> <http://www.unit4.**com/daas/graph#Graph<http://www.unit4.com/daas/graph#Graph>
>>>> >>
>>>>
>>>> }
>>>> GRAPH ?g
>>>> { ?s ?p ?o }
>>>> }
>>>>
>>>> When the result is instantiated I want to return the ?g as an RDFS
>>>> infmodel. Ideally I want to decide what to return based on the ?g. I've
>>>> traced the execSelect() and the ResultSetMem() but drew a blank as to
>>>> where
>>>> I can get at the ?g's!
>>>>
>>>>
>>> ResultSet.next().getResource("****g") ;
>>> or
>>> ResultSet.nextBinding().get(****Var.alloc("g")) ;
>>>
>>>
>>>
>>>
>>> The following allows me to wrap the returned graph but this is static
>>>> i.e.
>>>> I need to know the ?g's to generate the dgm to pass to the
>>>> QueryExecutionFactory.
>>>>
>>>> dataset.begin(ReadWrite.READ);
>>>> DatasetGraphMap dgm = new DatasetGraphMap(dataset.****asDatasetGraph())
>>>> {
>>>>
>>>>
>>>> @Override
>>>> public Graph getGraph(Node graphNode) {
>>>> Graph g = super.getGraph(graphNode);
>>>> if (graphNode.getURI().equals(****types.getURI())) {
>>>>
>>>> g = asRDFS(g);
>>>> }
>>>> return g;
>>>> }
>>>> public Graph asRDFS(Graph g) {
>>>> return
>>>> ModelFactory.createRDFSModel(****ModelFactory.****
>>>> createModelForGraph(g)).**
>>>>
>>>> getGraph();
>>>> }
>>>> };
>>>> Graph g = dgm.getGraph(types.asNode());
>>>> info(g.size());
>>>> dataset.end();
>>>>
>>>> For the following triples loaded in the default graph;
>>>>
>>>> @prefix rdf: <http://www.w3.org/1999/02/22-****rdf-syntax-ns#<http://www.w3.org/1999/02/22-**rdf-syntax-ns#>
>>>> <http://www.**w3.org/1999/02/22-rdf-syntax-**ns#<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
>>>> >
>>>>
>>>>> .
>>>>>
>>>> @prefix rdfs: <http://www.w3.org/2000/01/****rdf-schema#<http://www.w3.org/2000/01/**rdf-schema#>
>>>> <http://www.w3.org/**2000/01/rdf-schema#<http://www.w3.org/2000/01/rdf-schema#>
>>>> >
>>>>
>>>>> .
>>>>>
>>>>
>>>> @prefix graph: <http://www.unit4.com/daas/****graph#<http://www.unit4.com/daas/**graph#>
>>>> <http://www.unit4.com/**daas/graph# <http://www.unit4.com/daas/graph#>>
>>>>
>>>>> .
>>>>>
>>>>
>>>> @prefix graphs: <http://www.unit4.com/daas/****graphs/<http://www.unit4.com/daas/**graphs/>
>>>> <http://www.unit4.com/**daas/graphs/<http://www.unit4.com/daas/graphs/>
>>>> >
>>>>
>>>> .
>>>>>
>>>>
>>>> graph:Graph
>>>> rdf:type rdfs:Class.
>>>> graphs:g1
>>>> rdf:type graph:Graph.
>>>>
>>>> and these loaded in a named graph <http://www.unit4.com/daas/****
>>>> graphs/g1 <http://www.unit4.com/daas/**graphs/g1><http://www.unit4.**
>>>> com/daas/graphs/g1 <http://www.unit4.com/daas/graphs/g1>>
>>>>
>>>>> ;
>>>>>
>>>>
>>>> @prefix rdf: <http://www.w3.org/1999/02/22-****rdf-syntax-ns#<http://www.w3.org/1999/02/22-**rdf-syntax-ns#>
>>>> <http://www.**w3.org/1999/02/22-rdf-syntax-**ns#<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
>>>> >
>>>>
>>>>> .
>>>>>
>>>> @prefix rdfs: <http://www.w3.org/2000/01/****rdf-schema#<http://www.w3.org/2000/01/**rdf-schema#>
>>>> <http://www.w3.org/**2000/01/rdf-schema#<http://www.w3.org/2000/01/rdf-schema#>
>>>> >
>>>>
>>>>> .
>>>>>
>>>>
>>>> @prefix graph: <http://www.unit4.com/daas/****graph#<http://www.unit4.com/daas/**graph#>
>>>> <http://www.unit4.com/**daas/graph# <http://www.unit4.com/daas/graph#>>
>>>>
>>>>> .
>>>>>
>>>>
>>>> @prefix graphs: <http://www.unit4.com/daas/****graphs/<http://www.unit4.com/daas/**graphs/>
>>>> <http://www.unit4.com/**daas/graphs/<http://www.unit4.com/daas/graphs/>
>>>> >
>>>>
>>>> .
>>>>>
>>>>
>>>> graphs:g1
>>>> rdfs:label "Graph 1".
>>>>
>>>> A select returns;
>>>>
>>>> select * where {{ ?g a <http://www.unit4.com/daas/****graph#Graph<http://www.unit4.com/daas/**graph#Graph>
>>>> <http://www.unit4.**com/daas/graph#Graph<http://www.unit4.com/daas/graph#Graph>
>>>> >>
>>>>
>>>> }. graph ?g
>>>> {?s ?p ?o}}
>>>> ------------------------------****----------------------------**--**
>>>> ------------------------------****----------------------------**--**
>>>> --------------------
>>>> | g | s
>>>> | p | o |
>>>> ==============================****============================**==**
>>>> ==============================****============================**==**
>>>> ====================
>>>> | <http://www.unit4.com/daas/****graphs/g1<http://www.unit4.com/daas/**graphs/g1>
>>>> <http://www.unit4.**com/daas/graphs/g1<http://www.unit4.com/daas/graphs/g1>
>>>> >>
>>>> | <
>>>> http://www.unit4.com/daas/****graphs/g1<http://www.unit4.com/daas/**graphs/g1>
>>>> <http://www.unit4.**com/daas/graphs/g1<http://www.unit4.com/daas/graphs/g1>
>>>> >>
>>>> | <
>>>> http://www.w3.org/2000/01/rdf-****schema#label<http://www.w3.org/2000/01/rdf-**schema#label>
>>>> <http://www.w3.**org/2000/01/rdf-schema#label<http://www.w3.org/2000/01/rdf-schema#label>
>>>> >>
>>>> | "Graph 1" |
>>>> ------------------------------****----------------------------**--**
>>>> ------------------------------****----------------------------**--**
>>>>
>>>> --------------------
>>>>
>>>> What I want is for it to return about 40 more... :-)
>>>>
>>>>
>>>>
>>>
>>
>
Re: Dynamic graph/model inference within a select.
Posted by Andy Seaborne <an...@apache.org>.
On 19/06/13 20:11, Dick Murray wrote:
> Hi sorry PICNIC moment...
>
> I get the following results which is what I need. Against the dataset I get
> 2 results for each graph. Against the datasetgraphmap with override I get 2
> results for g2 but 4 results for g1 because of the RDFS.
>
> Problem with the 2 phase approach is that the phase 1 query isn't easy and
> then there's the issue whether it's atomic. Ideally it needs to be dynamic
> as the triples/quads are iterated
Atomicity is guaranteed inside a single transaction which can be several
queries/updates. Transactions are related to threads.
>
> Are you saying that optimization might cause the getGraph not to be called?
Yes
> Being called more than once for the same graph I can get around i.e. keep a
> cache for the duration of the query.
You could update via the RDFS view of the dataset. Maybe that way, you
only have to build it once.
>
> Thanks again.
>
> Dick.
Andy
Re: Dynamic graph/model inference within a select.
Posted by Dick Murray <da...@gmail.com>.
Hi sorry PICNIC moment...
I get the following results which is what I need. Against the dataset I get
2 results for each graph. Against the datasetgraphmap with override I get 2
results for g2 but 4 results for g1 because of the RDFS.
select * where {{ ?g a <http://example.org/graph#Graph> }. graph ?g {<
http://example.org/trek/Triton> ?p ?o}}
-------------------------------------------------------------------------------------------------------------------------------
| g | p
| o |
===============================================================================================================================
| <http://example.org/graphs/g1> | <
http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | <
http://example.org/bikes#SingleSpeed> |
| <http://example.org/graphs/g1> | <
http://www.w3.org/2000/01/rdf-schema#label> | "Triton"
|
| <http://example.org/graphs/g2> | <
http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | <
http://example.org/bikes#SingleSpeed> |
| <http://example.org/graphs/g2> | <
http://www.w3.org/2000/01/rdf-schema#label> | "Triton"
|
-------------------------------------------------------------------------------------------------------------------------------
select * where {{ ?g a <http://example.org/graph#Graph> }. graph ?g {<
http://example.org/trek/Triton> ?p ?o}}
-------------------------------------------------------------------------------------------------------------------------------
| g | p
| o |
===============================================================================================================================
| <http://example.org/graphs/g1> | <
http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | <
http://example.org/bikes#SingleSpeed> |
| <http://example.org/graphs/g1> | <
http://www.w3.org/2000/01/rdf-schema#label> | "Triton"
|
| <http://example.org/graphs/g1> | <
http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | <
http://example.org/bikes#Road> |
| <http://example.org/graphs/g1> | <
http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | <
http://example.org/bikes#Bike> |
| <http://example.org/graphs/g2> | <
http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | <
http://example.org/bikes#SingleSpeed> |
| <http://example.org/graphs/g2> | <
http://www.w3.org/2000/01/rdf-schema#label> | "Triton"
|
-------------------------------------------------------------------------------------------------------------------------------
Problem with the 2 phase approach is that the phase 1 query isn't easy and
then there's the issue whether it's atomic. Ideally it needs to be dynamic
as the triples/quads are iterated
Are you saying that optimization might cause the getGraph not to be called?
Being called more than once for the same graph I can get around i.e. keep a
cache for the duration of the query.
Thanks again.
Dick.
On 19 June 2013 12:20, Andy Seaborne <an...@apache.org> wrote:
> On 18/06/13 18:22, Dick Murray wrote:
>
>> I'm looking for dynamic inference based on the select. Given a dataset
>> with
>> multiple named graphs I would like the ability to wrap specific named
>> graphs based on some form of filter when the select is processed.
>>
>
> The dataset being queried can not be manipulated during the query.
>
> Whether getGraph is called is evaluator dependent (it's not in TDB which
> works on quads).
>
> There is no guarantee a query is executed in a particular order. It coudl
> do the GRAPH bit before the dft graph access. Currently, that unlikely,
> but there is no guarantee. Oh - and it may happen twice for rewritten
> queries (equality optimizations like to generate multiple more grounded
> accesses).
>
>
> Given the dataset D which contains the named graphs G1, G2, G3 I would
>> like
>> G2 to be returned with RDFS inference if it is queried in a select. I have
>> achieved this by wrapping the graph as an InfModel and using a
>> DatasetGraphMap but this requires that the graph be known before the
>> select
>> is executed. What I'm trying to find (if it exists) is the point during
>> the
>> select processing when the graph is identified and used? Does this exist
>> in
>> a TDB Dataset or is it just a set of quads?
>>
>
> Such a point exists (OpExecutor.execute(OpGraph)) but because of
> optimization and/or converting to quads.
>
> A TDB datsegraph is a set of triples (dft graph) + a set of quads (named
> graphs). Full quad based optimization isn't really done currently but it
> will be in future so any internal approach is going to be vulnerable to
> changes.
>
> I think you need a 2-phase approach.
>
> Phase-1 is setup - query the data and determine which graphs to add
> inference to.
>
> Phase-2 : Build a new datasetgraph and then query that for the real
> answers.
>
> Maybe that's what you are doing. If you query dgm I'd expect to see the
> RDFS inferences but it does not show where you issue the query. Complete,
> minimal example?
>
> Andy
>
>
>> Dick.
>>
>>
>> On 18 June 2013 16:01, Andy Seaborne <an...@apache.org> wrote:
>>
>> Dick,
>>>
>>> I'm not completely sure what you're trying to do - a complete minimal
>>> example showing how they bits and pieces fit together would be good. It
>>> seems to be querying the dataset without the inference graph. I don't
>>> see
>>> where you query the dataset (and which one)
>>>
>>> if (graphNode.getURI().equals(****types.getURI())) {
>>>>
>>>
>>> if (graphNode.equals(types.****asNode()) {
>>>
>>>
>>>
>>>
>>> On 18/06/13 14:22, Dick Murray wrote:
>>>
>>> Hi.
>>>>
>>>> Is it possible to get at the graph i.e. the ?g (specifically the
>>>> returned
>>>> nodes) when the following query is executed?
>>>>
>>>>
>>> Yes - getGraph / getNamedModel depending on which level your working at.
>>>
>>>
>>> SELECT *
>>>
>>>> WHERE
>>>> { { ?g <http://www.w3.org/1999/02/22-****rdf-syntax-ns#type<http://www.w3.org/1999/02/22-**rdf-syntax-ns#type>
>>>> <http://**www.w3.org/1999/02/22-rdf-**syntax-ns#type<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
>>>> >>
>>>> <
>>>> http://www.unit4.com/daas/****graph#Graph<http://www.unit4.com/daas/**graph#Graph>
>>>> <http://www.unit4.**com/daas/graph#Graph<http://www.unit4.com/daas/graph#Graph>
>>>> >>
>>>>
>>>> }
>>>> GRAPH ?g
>>>> { ?s ?p ?o }
>>>> }
>>>>
>>>> When the result is instantiated I want to return the ?g as an RDFS
>>>> infmodel. Ideally I want to decide what to return based on the ?g. I've
>>>> traced the execSelect() and the ResultSetMem() but drew a blank as to
>>>> where
>>>> I can get at the ?g's!
>>>>
>>>>
>>> ResultSet.next().getResource("****g") ;
>>> or
>>> ResultSet.nextBinding().get(****Var.alloc("g")) ;
>>>
>>>
>>>
>>>
>>> The following allows me to wrap the returned graph but this is static
>>>> i.e.
>>>> I need to know the ?g's to generate the dgm to pass to the
>>>> QueryExecutionFactory.
>>>>
>>>> dataset.begin(ReadWrite.READ);
>>>> DatasetGraphMap dgm = new DatasetGraphMap(dataset.****asDatasetGraph())
>>>> {
>>>>
>>>>
>>>> @Override
>>>> public Graph getGraph(Node graphNode) {
>>>> Graph g = super.getGraph(graphNode);
>>>> if (graphNode.getURI().equals(****types.getURI())) {
>>>>
>>>> g = asRDFS(g);
>>>> }
>>>> return g;
>>>> }
>>>> public Graph asRDFS(Graph g) {
>>>> return
>>>> ModelFactory.createRDFSModel(****ModelFactory.****
>>>> createModelForGraph(g)).**
>>>>
>>>> getGraph();
>>>> }
>>>> };
>>>> Graph g = dgm.getGraph(types.asNode());
>>>> info(g.size());
>>>> dataset.end();
>>>>
>>>> For the following triples loaded in the default graph;
>>>>
>>>> @prefix rdf: <http://www.w3.org/1999/02/22-****rdf-syntax-ns#<http://www.w3.org/1999/02/22-**rdf-syntax-ns#>
>>>> <http://www.**w3.org/1999/02/22-rdf-syntax-**ns#<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
>>>> >
>>>>
>>>>> .
>>>>>
>>>> @prefix rdfs: <http://www.w3.org/2000/01/****rdf-schema#<http://www.w3.org/2000/01/**rdf-schema#>
>>>> <http://www.w3.org/**2000/01/rdf-schema#<http://www.w3.org/2000/01/rdf-schema#>
>>>> >
>>>>
>>>>> .
>>>>>
>>>>
>>>> @prefix graph: <http://www.unit4.com/daas/****graph#<http://www.unit4.com/daas/**graph#>
>>>> <http://www.unit4.com/**daas/graph# <http://www.unit4.com/daas/graph#>>
>>>>
>>>>> .
>>>>>
>>>>
>>>> @prefix graphs: <http://www.unit4.com/daas/****graphs/<http://www.unit4.com/daas/**graphs/>
>>>> <http://www.unit4.com/**daas/graphs/<http://www.unit4.com/daas/graphs/>
>>>> >
>>>>
>>>> .
>>>>>
>>>>
>>>> graph:Graph
>>>> rdf:type rdfs:Class.
>>>> graphs:g1
>>>> rdf:type graph:Graph.
>>>>
>>>> and these loaded in a named graph <http://www.unit4.com/daas/****
>>>> graphs/g1 <http://www.unit4.com/daas/**graphs/g1><http://www.unit4.**
>>>> com/daas/graphs/g1 <http://www.unit4.com/daas/graphs/g1>>
>>>>
>>>>> ;
>>>>>
>>>>
>>>> @prefix rdf: <http://www.w3.org/1999/02/22-****rdf-syntax-ns#<http://www.w3.org/1999/02/22-**rdf-syntax-ns#>
>>>> <http://www.**w3.org/1999/02/22-rdf-syntax-**ns#<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
>>>> >
>>>>
>>>>> .
>>>>>
>>>> @prefix rdfs: <http://www.w3.org/2000/01/****rdf-schema#<http://www.w3.org/2000/01/**rdf-schema#>
>>>> <http://www.w3.org/**2000/01/rdf-schema#<http://www.w3.org/2000/01/rdf-schema#>
>>>> >
>>>>
>>>>> .
>>>>>
>>>>
>>>> @prefix graph: <http://www.unit4.com/daas/****graph#<http://www.unit4.com/daas/**graph#>
>>>> <http://www.unit4.com/**daas/graph# <http://www.unit4.com/daas/graph#>>
>>>>
>>>>> .
>>>>>
>>>>
>>>> @prefix graphs: <http://www.unit4.com/daas/****graphs/<http://www.unit4.com/daas/**graphs/>
>>>> <http://www.unit4.com/**daas/graphs/<http://www.unit4.com/daas/graphs/>
>>>> >
>>>>
>>>> .
>>>>>
>>>>
>>>> graphs:g1
>>>> rdfs:label "Graph 1".
>>>>
>>>> A select returns;
>>>>
>>>> select * where {{ ?g a <http://www.unit4.com/daas/****graph#Graph<http://www.unit4.com/daas/**graph#Graph>
>>>> <http://www.unit4.**com/daas/graph#Graph<http://www.unit4.com/daas/graph#Graph>
>>>> >>
>>>>
>>>> }. graph ?g
>>>> {?s ?p ?o}}
>>>> ------------------------------****----------------------------**--**
>>>> ------------------------------****----------------------------**--**
>>>> --------------------
>>>> | g | s
>>>> | p | o |
>>>> ==============================****============================**==**
>>>> ==============================****============================**==**
>>>> ====================
>>>> | <http://www.unit4.com/daas/****graphs/g1<http://www.unit4.com/daas/**graphs/g1>
>>>> <http://www.unit4.**com/daas/graphs/g1<http://www.unit4.com/daas/graphs/g1>
>>>> >>
>>>> | <
>>>> http://www.unit4.com/daas/****graphs/g1<http://www.unit4.com/daas/**graphs/g1>
>>>> <http://www.unit4.**com/daas/graphs/g1<http://www.unit4.com/daas/graphs/g1>
>>>> >>
>>>> | <
>>>> http://www.w3.org/2000/01/rdf-****schema#label<http://www.w3.org/2000/01/rdf-**schema#label>
>>>> <http://www.w3.**org/2000/01/rdf-schema#label<http://www.w3.org/2000/01/rdf-schema#label>
>>>> >>
>>>> | "Graph 1" |
>>>> ------------------------------****----------------------------**--**
>>>> ------------------------------****----------------------------**--**
>>>>
>>>> --------------------
>>>>
>>>> What I want is for it to return about 40 more... :-)
>>>>
>>>>
>>>>
>>>
>>
>
Re: Dynamic graph/model inference within a select.
Posted by Andy Seaborne <an...@apache.org>.
On 18/06/13 18:22, Dick Murray wrote:
> I'm looking for dynamic inference based on the select. Given a dataset with
> multiple named graphs I would like the ability to wrap specific named
> graphs based on some form of filter when the select is processed.
The dataset being queried can not be manipulated during the query.
Whether getGraph is called is evaluator dependent (it's not in TDB which
works on quads).
There is no guarantee a query is executed in a particular order. It
coudl do the GRAPH bit before the dft graph access. Currently, that
unlikely, but there is no guarantee. Oh - and it may happen twice for
rewritten queries (equality optimizations like to generate multiple more
grounded accesses).
> Given the dataset D which contains the named graphs G1, G2, G3 I would like
> G2 to be returned with RDFS inference if it is queried in a select. I have
> achieved this by wrapping the graph as an InfModel and using a
> DatasetGraphMap but this requires that the graph be known before the select
> is executed. What I'm trying to find (if it exists) is the point during the
> select processing when the graph is identified and used? Does this exist in
> a TDB Dataset or is it just a set of quads?
Such a point exists (OpExecutor.execute(OpGraph)) but because of
optimization and/or converting to quads.
A TDB datsegraph is a set of triples (dft graph) + a set of quads (named
graphs). Full quad based optimization isn't really done currently but
it will be in future so any internal approach is going to be vulnerable
to changes.
I think you need a 2-phase approach.
Phase-1 is setup - query the data and determine which graphs to add
inference to.
Phase-2 : Build a new datasetgraph and then query that for the real answers.
Maybe that's what you are doing. If you query dgm I'd expect to see the
RDFS inferences but it does not show where you issue the query.
Complete, minimal example?
Andy
>
> Dick.
>
>
> On 18 June 2013 16:01, Andy Seaborne <an...@apache.org> wrote:
>
>> Dick,
>>
>> I'm not completely sure what you're trying to do - a complete minimal
>> example showing how they bits and pieces fit together would be good. It
>> seems to be querying the dataset without the inference graph. I don't see
>> where you query the dataset (and which one)
>>
>>> if (graphNode.getURI().equals(**types.getURI())) {
>>
>> if (graphNode.equals(types.**asNode()) {
>>
>>
>>
>> On 18/06/13 14:22, Dick Murray wrote:
>>
>>> Hi.
>>>
>>> Is it possible to get at the graph i.e. the ?g (specifically the returned
>>> nodes) when the following query is executed?
>>>
>>
>> Yes - getGraph / getNamedModel depending on which level your working at.
>>
>>
>> SELECT *
>>> WHERE
>>> { { ?g <http://www.w3.org/1999/02/22-**rdf-syntax-ns#type<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>>
>>> <
>>> http://www.unit4.com/daas/**graph#Graph<http://www.unit4.com/daas/graph#Graph>>
>>> }
>>> GRAPH ?g
>>> { ?s ?p ?o }
>>> }
>>>
>>> When the result is instantiated I want to return the ?g as an RDFS
>>> infmodel. Ideally I want to decide what to return based on the ?g. I've
>>> traced the execSelect() and the ResultSetMem() but drew a blank as to
>>> where
>>> I can get at the ?g's!
>>>
>>
>> ResultSet.next().getResource("**g") ;
>> or
>> ResultSet.nextBinding().get(**Var.alloc("g")) ;
>>
>>
>>
>>
>>> The following allows me to wrap the returned graph but this is static i.e.
>>> I need to know the ?g's to generate the dgm to pass to the
>>> QueryExecutionFactory.
>>>
>>> dataset.begin(ReadWrite.READ);
>>> DatasetGraphMap dgm = new DatasetGraphMap(dataset.**asDatasetGraph()) {
>>>
>>> @Override
>>> public Graph getGraph(Node graphNode) {
>>> Graph g = super.getGraph(graphNode);
>>> if (graphNode.getURI().equals(**types.getURI())) {
>>> g = asRDFS(g);
>>> }
>>> return g;
>>> }
>>> public Graph asRDFS(Graph g) {
>>> return
>>> ModelFactory.createRDFSModel(**ModelFactory.**createModelForGraph(g)).**
>>> getGraph();
>>> }
>>> };
>>> Graph g = dgm.getGraph(types.asNode());
>>> info(g.size());
>>> dataset.end();
>>>
>>> For the following triples loaded in the default graph;
>>>
>>> @prefix rdf: <http://www.w3.org/1999/02/22-**rdf-syntax-ns#<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
>>>> .
>>> @prefix rdfs: <http://www.w3.org/2000/01/**rdf-schema#<http://www.w3.org/2000/01/rdf-schema#>
>>>> .
>>>
>>> @prefix graph: <http://www.unit4.com/daas/**graph#<http://www.unit4.com/daas/graph#>
>>>> .
>>>
>>> @prefix graphs: <http://www.unit4.com/daas/**graphs/<http://www.unit4.com/daas/graphs/>
>>>> .
>>>
>>> graph:Graph
>>> rdf:type rdfs:Class.
>>> graphs:g1
>>> rdf:type graph:Graph.
>>>
>>> and these loaded in a named graph <http://www.unit4.com/daas/**graphs/g1<http://www.unit4.com/daas/graphs/g1>
>>>> ;
>>>
>>> @prefix rdf: <http://www.w3.org/1999/02/22-**rdf-syntax-ns#<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
>>>> .
>>> @prefix rdfs: <http://www.w3.org/2000/01/**rdf-schema#<http://www.w3.org/2000/01/rdf-schema#>
>>>> .
>>>
>>> @prefix graph: <http://www.unit4.com/daas/**graph#<http://www.unit4.com/daas/graph#>
>>>> .
>>>
>>> @prefix graphs: <http://www.unit4.com/daas/**graphs/<http://www.unit4.com/daas/graphs/>
>>>> .
>>>
>>> graphs:g1
>>> rdfs:label "Graph 1".
>>>
>>> A select returns;
>>>
>>> select * where {{ ?g a <http://www.unit4.com/daas/**graph#Graph<http://www.unit4.com/daas/graph#Graph>>
>>> }. graph ?g
>>> {?s ?p ?o}}
>>> ------------------------------**------------------------------**
>>> ------------------------------**------------------------------**
>>> --------------------
>>> | g | s
>>> | p | o |
>>> ==============================**==============================**
>>> ==============================**==============================**
>>> ====================
>>> | <http://www.unit4.com/daas/**graphs/g1<http://www.unit4.com/daas/graphs/g1>>
>>> | <
>>> http://www.unit4.com/daas/**graphs/g1<http://www.unit4.com/daas/graphs/g1>>
>>> | <
>>> http://www.w3.org/2000/01/rdf-**schema#label<http://www.w3.org/2000/01/rdf-schema#label>>
>>> | "Graph 1" |
>>> ------------------------------**------------------------------**
>>> ------------------------------**------------------------------**
>>> --------------------
>>>
>>> What I want is for it to return about 40 more... :-)
>>>
>>>
>>
>
Re: Dynamic graph/model inference within a select.
Posted by Dick Murray <da...@gmail.com>.
I'm looking for dynamic inference based on the select. Given a dataset with
multiple named graphs I would like the ability to wrap specific named
graphs based on some form of filter when the select is processed.
Given the dataset D which contains the named graphs G1, G2, G3 I would like
G2 to be returned with RDFS inference if it is queried in a select. I have
achieved this by wrapping the graph as an InfModel and using a
DatasetGraphMap but this requires that the graph be known before the select
is executed. What I'm trying to find (if it exists) is the point during the
select processing when the graph is identified and used? Does this exist in
a TDB Dataset or is it just a set of quads?
Dick.
On 18 June 2013 16:01, Andy Seaborne <an...@apache.org> wrote:
> Dick,
>
> I'm not completely sure what you're trying to do - a complete minimal
> example showing how they bits and pieces fit together would be good. It
> seems to be querying the dataset without the inference graph. I don't see
> where you query the dataset (and which one)
>
> > if (graphNode.getURI().equals(**types.getURI())) {
>
> if (graphNode.equals(types.**asNode()) {
>
>
>
> On 18/06/13 14:22, Dick Murray wrote:
>
>> Hi.
>>
>> Is it possible to get at the graph i.e. the ?g (specifically the returned
>> nodes) when the following query is executed?
>>
>
> Yes - getGraph / getNamedModel depending on which level your working at.
>
>
> SELECT *
>> WHERE
>> { { ?g <http://www.w3.org/1999/02/22-**rdf-syntax-ns#type<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>>
>> <
>> http://www.unit4.com/daas/**graph#Graph<http://www.unit4.com/daas/graph#Graph>>
>> }
>> GRAPH ?g
>> { ?s ?p ?o }
>> }
>>
>> When the result is instantiated I want to return the ?g as an RDFS
>> infmodel. Ideally I want to decide what to return based on the ?g. I've
>> traced the execSelect() and the ResultSetMem() but drew a blank as to
>> where
>> I can get at the ?g's!
>>
>
> ResultSet.next().getResource("**g") ;
> or
> ResultSet.nextBinding().get(**Var.alloc("g")) ;
>
>
>
>
>> The following allows me to wrap the returned graph but this is static i.e.
>> I need to know the ?g's to generate the dgm to pass to the
>> QueryExecutionFactory.
>>
>> dataset.begin(ReadWrite.READ);
>> DatasetGraphMap dgm = new DatasetGraphMap(dataset.**asDatasetGraph()) {
>>
>> @Override
>> public Graph getGraph(Node graphNode) {
>> Graph g = super.getGraph(graphNode);
>> if (graphNode.getURI().equals(**types.getURI())) {
>> g = asRDFS(g);
>> }
>> return g;
>> }
>> public Graph asRDFS(Graph g) {
>> return
>> ModelFactory.createRDFSModel(**ModelFactory.**createModelForGraph(g)).**
>> getGraph();
>> }
>> };
>> Graph g = dgm.getGraph(types.asNode());
>> info(g.size());
>> dataset.end();
>>
>> For the following triples loaded in the default graph;
>>
>> @prefix rdf: <http://www.w3.org/1999/02/22-**rdf-syntax-ns#<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
>> >.
>> @prefix rdfs: <http://www.w3.org/2000/01/**rdf-schema#<http://www.w3.org/2000/01/rdf-schema#>
>> >.
>>
>> @prefix graph: <http://www.unit4.com/daas/**graph#<http://www.unit4.com/daas/graph#>
>> >.
>>
>> @prefix graphs: <http://www.unit4.com/daas/**graphs/<http://www.unit4.com/daas/graphs/>
>> >.
>>
>> graph:Graph
>> rdf:type rdfs:Class.
>> graphs:g1
>> rdf:type graph:Graph.
>>
>> and these loaded in a named graph <http://www.unit4.com/daas/**graphs/g1<http://www.unit4.com/daas/graphs/g1>
>> >;
>>
>> @prefix rdf: <http://www.w3.org/1999/02/22-**rdf-syntax-ns#<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
>> >.
>> @prefix rdfs: <http://www.w3.org/2000/01/**rdf-schema#<http://www.w3.org/2000/01/rdf-schema#>
>> >.
>>
>> @prefix graph: <http://www.unit4.com/daas/**graph#<http://www.unit4.com/daas/graph#>
>> >.
>>
>> @prefix graphs: <http://www.unit4.com/daas/**graphs/<http://www.unit4.com/daas/graphs/>
>> >.
>>
>> graphs:g1
>> rdfs:label "Graph 1".
>>
>> A select returns;
>>
>> select * where {{ ?g a <http://www.unit4.com/daas/**graph#Graph<http://www.unit4.com/daas/graph#Graph>>
>> }. graph ?g
>> {?s ?p ?o}}
>> ------------------------------**------------------------------**
>> ------------------------------**------------------------------**
>> --------------------
>> | g | s
>> | p | o |
>> ==============================**==============================**
>> ==============================**==============================**
>> ====================
>> | <http://www.unit4.com/daas/**graphs/g1<http://www.unit4.com/daas/graphs/g1>>
>> | <
>> http://www.unit4.com/daas/**graphs/g1<http://www.unit4.com/daas/graphs/g1>>
>> | <
>> http://www.w3.org/2000/01/rdf-**schema#label<http://www.w3.org/2000/01/rdf-schema#label>>
>> | "Graph 1" |
>> ------------------------------**------------------------------**
>> ------------------------------**------------------------------**
>> --------------------
>>
>> What I want is for it to return about 40 more... :-)
>>
>>
>
Re: Dynamic graph/model inference within a select.
Posted by Andy Seaborne <an...@apache.org>.
Dick,
I'm not completely sure what you're trying to do - a complete minimal
example showing how they bits and pieces fit together would be good. It
seems to be querying the dataset without the inference graph. I don't
see where you query the dataset (and which one)
> if (graphNode.getURI().equals(types.getURI())) {
if (graphNode.equals(types.asNode()) {
On 18/06/13 14:22, Dick Murray wrote:
> Hi.
>
> Is it possible to get at the graph i.e. the ?g (specifically the returned
> nodes) when the following query is executed?
Yes - getGraph / getNamedModel depending on which level your working at.
> SELECT *
> WHERE
> { { ?g <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <
> http://www.unit4.com/daas/graph#Graph> }
> GRAPH ?g
> { ?s ?p ?o }
> }
>
> When the result is instantiated I want to return the ?g as an RDFS
> infmodel. Ideally I want to decide what to return based on the ?g. I've
> traced the execSelect() and the ResultSetMem() but drew a blank as to where
> I can get at the ?g's!
ResultSet.next().getResource("g") ;
or
ResultSet.nextBinding().get(Var.alloc("g")) ;
>
> The following allows me to wrap the returned graph but this is static i.e.
> I need to know the ?g's to generate the dgm to pass to the
> QueryExecutionFactory.
>
> dataset.begin(ReadWrite.READ);
> DatasetGraphMap dgm = new DatasetGraphMap(dataset.asDatasetGraph()) {
>
> @Override
> public Graph getGraph(Node graphNode) {
> Graph g = super.getGraph(graphNode);
> if (graphNode.getURI().equals(types.getURI())) {
> g = asRDFS(g);
> }
> return g;
> }
> public Graph asRDFS(Graph g) {
> return
> ModelFactory.createRDFSModel(ModelFactory.createModelForGraph(g)).getGraph();
> }
> };
> Graph g = dgm.getGraph(types.asNode());
> info(g.size());
> dataset.end();
>
> For the following triples loaded in the default graph;
>
> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
> @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
>
> @prefix graph: <http://www.unit4.com/daas/graph#>.
>
> @prefix graphs: <http://www.unit4.com/daas/graphs/>.
>
> graph:Graph
> rdf:type rdfs:Class.
> graphs:g1
> rdf:type graph:Graph.
>
> and these loaded in a named graph <http://www.unit4.com/daas/graphs/g1>;
>
> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
> @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
>
> @prefix graph: <http://www.unit4.com/daas/graph#>.
>
> @prefix graphs: <http://www.unit4.com/daas/graphs/>.
>
> graphs:g1
> rdfs:label "Graph 1".
>
> A select returns;
>
> select * where {{ ?g a <http://www.unit4.com/daas/graph#Graph> }. graph ?g
> {?s ?p ?o}}
> --------------------------------------------------------------------------------------------------------------------------------------------
> | g | s
> | p | o |
> ============================================================================================================================================
> | <http://www.unit4.com/daas/graphs/g1> | <
> http://www.unit4.com/daas/graphs/g1> | <
> http://www.w3.org/2000/01/rdf-schema#label> | "Graph 1" |
> --------------------------------------------------------------------------------------------------------------------------------------------
>
> What I want is for it to return about 40 more... :-)
>