- From: Michael Schneider <m_schnei@gmx.de>
- Date: Tue, 05 Jun 2007 14:05:19 +0200
- To: paul@proxml.be
- Cc: public-sparql-dev@w3.org, topbraid-composer-users@googlegroups.com
[second try, missed to define subject]
Hi, Paul!
Paul Hermans wrote on Mon, 4 Jun 2007:
> Given
>
> PREFIX pcce: <http://www.pcce.be/egb/>
> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
> PREFIX owl: <http://www.w3.org/2002/07/owl#>
> SELECT ?property ?object ?value
BTW: It would have been nice to also post an example RDF graph. Below, you find my own, which I created and tested with Topbraid Composer.
> This works
> WHERE
> {?subject ?property ?object.
> ?property a owl:ObjectProperty.
> ?object rdfs:label ?value}
Yes.
> This works also
> WHERE {
> {?subject ?property ?object.
> ?property a owl:DataProperty}
This results in an empty list, because there is no 'owl:DataProperty' in OWL, only a 'owl:DatatypeProperty'.
> But the union only returns object properties (everything before the
> union) in this case
>
> WHERE {
> {?subject ?property ?object.
> ?property a owl:ObjectProperty.
> ?object rdfs:label ?value}
> UNION
> {?subject ?property ?object.
> ?property a owl:DataProperty} }
>
>
> And only data properties (before the union) in this case
Not true, you again only get object properties. Due to the misnamer 'DataProperty'.
> WHERE {
> {?subject ?property ?object.
> ?property a owl:DataProperty}
> UNION
> {?subject ?property ?object.
> ?property a owl:ObjectProperty.
> ?object rdfs:label ?value} }
>
>
> While I would like to have both.
Rename 'DataProperty' to 'DatatypeProperty'. This should give you all results.
Cheers,
Michael
=========== example RDF ================
<?xml version="1.0"?>
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:owl="http://www.w3.org/2002/07/owl#"
xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
xmlns="http://www.example.org/unnamed0.owl#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xml:base="http://www.example.org/unnamed0.owl">
<owl:Ontology rdf:about="">
<owl:versionInfo rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Created with TopBraid Composer</owl:versionInfo>
</owl:Ontology>
<owl:ObjectProperty rdf:ID="op"/>
<owl:DatatypeProperty rdf:ID="dp"/>
<owl:Thing rdf:ID="y">
<rdfs:label>foo</rdfs:label>
</owl:Thing>
<owl:Thing rdf:ID="x">
<dp rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>data</dp>
<op rdf:resource="#y"/>
</owl:Thing>
</rdf:RDF>
<!-- Created with TopBraid Composer -->
--
Michael Schneider <m_schnei@gmx.de>
--
Michael Schneider <m_schnei@gmx.de>
Received on Tuesday, 5 June 2007 12:05:31 UTC