Hi Everybody,
I have a problem with the SPARQL engine of Virtuoso. I want to use it
with the next ontology:
<?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://reedcourty.github.com/ontologies/tags#";
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#";
xml:base="http://reedcourty.github.com/ontologies/tags";>
<owl:Ontology rdf:about="">
<owl:versionInfo rdf:datatype="http://www.w3.org/2001/XMLSchema#string";
>Created with TopBraid Composer</owl:versionInfo>
</owl:Ontology>
<owl:Class rdf:ID="Tag">
<rdfs:subClassOf rdf:resource="http://www.w3.org/2002/07/owl#Thing"/>
</owl:Class>
<owl:Class rdf:ID="FieldNameInDB">
<rdfs:subClassOf rdf:resource="#Tag"/>
</owl:Class>
<owl:ObjectProperty rdf:ID="tagging">
<rdfs:range rdf:resource="http://www.w3.org/2002/07/owl#Thing"/>
<rdfs:domain rdf:resource="#Tag"/>
<rdfs:comment rdf:datatype="http://www.w3.org/2001/XMLSchema#string";
>The tag tagging a Thing</rdfs:comment>
<owl:inverseOf>
<owl:ObjectProperty rdf:ID="taggedBy"/>
</owl:inverseOf>
</owl:ObjectProperty>
<owl:ObjectProperty rdf:about="#taggedBy">
<owl:inverseOf rdf:resource="#tagging"/>
<rdfs:range rdf:resource="#Tag"/>
<rdfs:comment rdf:datatype="http://www.w3.org/2001/XMLSchema#string";
>The Thing tagged by a Tag</rdfs:comment>
<rdfs:domain rdf:resource="http://www.w3.org/2002/07/owl#Thing"/>
</owl:ObjectProperty>
<rdf:Property rdf:ID="hasComment">
<rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#string"/>
<rdfs:domain rdf:resource="#Tag"/>
<rdfs:comment rdf:datatype="http://www.w3.org/2001/XMLSchema#string";
>The tag has a comment</rdfs:comment>
</rdf:Property>
<rdf:Property rdf:ID="addedBy">
<rdfs:domain rdf:resource="#Tag"/>
<rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#string"/>
<rdfs:comment rdf:datatype="http://www.w3.org/2001/XMLSchema#string";
>Added by somebody</rdfs:comment>
</rdf:Property>
<rdf:Property rdf:ID="hasName">
<rdfs:domain rdf:resource="#Tag"/>
<rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#string"/>
<rdfs:comment rdf:datatype="http://www.w3.org/2001/XMLSchema#string";
>The tag has a name</rdfs:comment>
</rdf:Property>
<rdf:Property rdf:ID="addedAt">
<rdfs:domain rdf:resource="#Tag"/>
<rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#dateTime"/>
<rdfs:comment rdf:datatype="http://www.w3.org/2001/XMLSchema#string";
>E.g. the tag added at "2013-10-10T095100"</rdfs:comment>
</rdf:Property>
</rdf:RDF>
I had uploaded the RDF file to Virtuoso via it's webdav service. Then I
used the following query (but by using others I got the same result):
PREFIX tags: <http://reedcourty.github.com/ontologies/tags#>
SELECT ?tag
WHERE {
?tag rdfs:subClassOf tags:Tag .
}
The problem is that I got back every item twice, like:
http://reedcourty.github.com/ontologies/tags#FieldNameInDB
http://reedcourty.github.com/ontologies/tags#FieldNameInDB
What is the problem?
I'm using Virtuoso version 07.00.3203 on Win64 (x86_64-generic-win-64),
Single Server Edition
--
Nádudvari Gyuri (Reedcourty)
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