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rdfsparqlowlontology

Accessing data properties from owl file

I am new to ontologies. I am creating an .owl file by using protege 4.3. I am accessing object properties by using SPARQL queries such as: 

Prefix: <http://www.workingontologist.org/Examples/Chapter3/Product.owl#>

select ?x ?y where { 
  ?x :hasPizza ?y
}

This works fine, and shows all object properties related to the member.

When I access data properties from that owl file, I am not able to read or access data properties

Please give suggestions on how I can access data properties from that owl file

Thanks for helping

my owl file is

<?xml version="1.0"?>
<!DOCTYPE rdf:RDF [
    <!ENTITY owl "http://www.w3.org/2002/07/owl#" >
    <!ENTITY xsd "http://www.w3.org/2001/XMLSchema#" >
    <!ENTITY daml "http://www.daml.org/2001/03/daml+oil#" >
    <!ENTITY rdfs "http://www.w3.org/2000/01/rdf-schema#" >
    <!ENTITY rdf "http://www.w3.org/1999/02/22-rdf-syntax-ns#" >
    <!ENTITY mfg "http://www.workingontologist.org/Examples/Chapter3/Product.owl#" >
]>
<rdf:RDF xmlns="http://www.workingontologist.org/Examples/Chapter3/Product.owl#"
     xml:base="http://www.workingontologist.org/Examples/Chapter3/Product.owl"
     xmlns:mfg="http://www.workingontologist.org/Examples/Chapter3/Product.owl#"
     xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
     xmlns:owl="http://www.w3.org/2002/07/owl#"
     xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
     xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
     xmlns:daml="http://www.daml.org/2001/03/daml+oil#">
    <owl:Ontology rdf:about="http://www.workingontologist.org/Examples/Chapter3/Product.owl">
        <owl:versionInfo rdf:datatype="&xsd;string">Created with TopBraid Spreadsheet converter</owl:versionInfo>
    </owl:Ontology>

    <!-- 
    ///////////////////////////////////////////////////////////////////////////////////////
    //
    // Object Properties
    //
    ///////////////////////////////////////////////////////////////////////////////////////
     -->




    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#hasPizza -->
    <owl:ObjectProperty rdf:about="&mfg;hasPizza"/>

    <!-- 
    ///////////////////////////////////////////////////////////////////////////////////////
    //
    // Data properties
    //
    ///////////////////////////////////////////////////////////////////////////////////////
     -->




    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product_Available -->

    <owl:DatatypeProperty rdf:about="&mfg;Product_Available">
        <rdfs:label rdf:datatype="&xsd;string">Available</rdfs:label>
        <rdfs:range rdf:resource="&xsd;string"/>
        <rdfs:domain rdf:resource="&mfg;Product"/>
    </owl:DatatypeProperty>



    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product_Division -->

    <owl:DatatypeProperty rdf:about="&mfg;Product_Division">
        <rdfs:label rdf:datatype="&xsd;string">Division</rdfs:label>
        <rdfs:range rdf:resource="&xsd;string"/>
        <rdfs:domain rdf:resource="&mfg;Product"/>
    </owl:DatatypeProperty>



    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product_ID -->

    <owl:DatatypeProperty rdf:about="&mfg;Product_ID">
        <rdfs:label rdf:datatype="&xsd;string">ID</rdfs:label>
        <rdfs:range rdf:resource="&xsd;string"/>
        <rdfs:domain rdf:resource="&mfg;Product"/>
    </owl:DatatypeProperty>



    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product_Manufacture_Location -->

    <owl:DatatypeProperty rdf:about="&mfg;Product_Manufacture_Location">
        <rdfs:label rdf:datatype="&xsd;string">Manufacture Location</rdfs:label>
        <rdfs:range rdf:resource="&xsd;string"/>
        <rdfs:domain rdf:resource="&mfg;Product"/>
    </owl:DatatypeProperty>



    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product_ModelNo -->

    <owl:DatatypeProperty rdf:about="&mfg;Product_ModelNo">
        <rdfs:label rdf:datatype="&xsd;string">ModelNo</rdfs:label>
        <rdfs:range rdf:resource="&xsd;string"/>
        <rdfs:domain rdf:resource="&mfg;Product"/>
    </owl:DatatypeProperty>



    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product_Product_Line -->

    <owl:DatatypeProperty rdf:about="&mfg;Product_Product_Line">
        <rdfs:label rdf:datatype="&xsd;string">Product Line</rdfs:label>
        <rdfs:range rdf:resource="&xsd;string"/>
        <rdfs:domain rdf:resource="&mfg;Product"/>
    </owl:DatatypeProperty>



    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product_SKU -->

    <owl:DatatypeProperty rdf:about="&mfg;Product_SKU">
        <rdfs:label rdf:datatype="&xsd;string">SKU</rdfs:label>
        <rdfs:range rdf:resource="&xsd;string"/>
        <rdfs:domain rdf:resource="&mfg;Product"/>
    </owl:DatatypeProperty>



    <!-- 
    ///////////////////////////////////////////////////////////////////////////////////////
    //
    // Classes
    //
    ///////////////////////////////////////////////////////////////////////////////////////
     -->




    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product -->

    <owl:Class rdf:about="&mfg;Product"/>



    <!-- 
    ///////////////////////////////////////////////////////////////////////////////////////
    //
    // Individuals
    //
    ///////////////////////////////////////////////////////////////////////////////////////
     -->




    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product1 -->

    <owl:NamedIndividual rdf:about="&mfg;Product1">
        <rdf:type rdf:resource="&mfg;Product"/>
        <rdfs:label rdf:datatype="&xsd;string">Product 1</rdfs:label>
        <Product_ID rdf:datatype="&xsd;string">1</Product_ID>
        <Product_Available rdf:datatype="&xsd;string">23</Product_Available>
        <Product_SKU rdf:datatype="&xsd;string">FB3524</Product_SKU>
        <Product_Division rdf:datatype="&xsd;string">Manufacturing support</Product_Division>
        <Product_Product_Line rdf:datatype="&xsd;string">Papermachine</Product_Product_Line>
        <Product_Manufacture_Location rdf:datatype="&xsd;string">Sacramento</Product_Manufacture_Location>
        <Product_ModelNo rdf:datatype="&xsd;string">ZX-3</Product_ModelNo>
        <hasPizza rdf:resource="&mfg;Product1"/>
        <hasPizza rdf:resource="&mfg;Product2"/>
        <hasPizza rdf:resource="&mfg;Product3"/>
    </owl:NamedIndividual>



    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product2 -->

    <owl:NamedIndividual rdf:about="&mfg;Product2">
        <rdf:type rdf:resource="&mfg;Product"/>
        <rdfs:label rdf:datatype="&xsd;string">Product 2</rdfs:label>
        <Product_ID rdf:datatype="&xsd;string">2</Product_ID>
        <Product_Available rdf:datatype="&xsd;string">4</Product_Available>
        <Product_SKU rdf:datatype="&xsd;string">KD5243</Product_SKU>
        <Product_Division rdf:datatype="&xsd;string">Manufacturing support</Product_Division>
        <Product_Product_Line rdf:datatype="&xsd;string">Paper machine</Product_Product_Line>
        <Product_Manufacture_Location rdf:datatype="&xsd;string">Sacramento</Product_Manufacture_Location>
        <Product_ModelNo rdf:datatype="&xsd;string">ZX-3P</Product_ModelNo>
        <hasPizza rdf:resource="&mfg;Product2"/>
        <hasPizza rdf:resource="&mfg;Product7"/>
    </owl:NamedIndividual>



    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product3 -->

    <owl:NamedIndividual rdf:about="&mfg;Product3">
        <rdf:type rdf:resource="&mfg;Product"/>
        <rdfs:label rdf:datatype="&xsd;string">Product 3</rdfs:label>
        <Product_ID rdf:datatype="&xsd;string">3</Product_ID>
        <Product_Available rdf:datatype="&xsd;string">34</Product_Available>
        <Product_SKU rdf:datatype="&xsd;string">IL4028</Product_SKU>
        <Product_Division rdf:datatype="&xsd;string">Manufacturing support</Product_Division>
        <Product_Product_Line rdf:datatype="&xsd;string">Paper machine</Product_Product_Line>
        <Product_Manufacture_Location rdf:datatype="&xsd;string">Sacramento</Product_Manufacture_Location>
        <Product_ModelNo rdf:datatype="&xsd;string">ZX-3S</Product_ModelNo>
    </owl:NamedIndividual>



    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product4 -->

    <owl:NamedIndividual rdf:about="&mfg;Product4">
        <rdf:type rdf:resource="&mfg;Product"/>
        <rdfs:label rdf:datatype="&xsd;string">Product 4</rdfs:label>
        <Product_Available rdf:datatype="&xsd;string">23</Product_Available>
        <Product_ID rdf:datatype="&xsd;string">4</Product_ID>
        <Product_ModelNo rdf:datatype="&xsd;string">B-1430</Product_ModelNo>
        <Product_Division rdf:datatype="&xsd;string">Control Engineering</Product_Division>
        <Product_Manufacture_Location rdf:datatype="&xsd;string">Elizabeth</Product_Manufacture_Location>
        <Product_Product_Line rdf:datatype="&xsd;string">Feedback line</Product_Product_Line>
        <Product_SKU rdf:datatype="&xsd;string">KS4520</Product_SKU>
    </owl:NamedIndividual>



    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product5 -->

    <owl:NamedIndividual rdf:about="&mfg;Product5">
        <rdf:type rdf:resource="&mfg;Product"/>
        <rdfs:label rdf:datatype="&xsd;string">Product 5</rdfs:label>
        <Product_Available rdf:datatype="&xsd;string">14</Product_Available>
        <Product_ID rdf:datatype="&xsd;string">5</Product_ID>
        <Product_ModelNo rdf:datatype="&xsd;string">B-1430X</Product_ModelNo>
        <Product_SKU rdf:datatype="&xsd;string">CL5934</Product_SKU>
        <Product_Division rdf:datatype="&xsd;string">Control Engineering</Product_Division>
        <Product_Manufacture_Location rdf:datatype="&xsd;string">Elizabeth</Product_Manufacture_Location>
        <Product_Product_Line rdf:datatype="&xsd;string">Feedback line</Product_Product_Line>
    </owl:NamedIndividual>



    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product6 -->

    <owl:NamedIndividual rdf:about="&mfg;Product6">
        <rdf:type rdf:resource="&mfg;Product"/>
        <rdfs:label rdf:datatype="&xsd;string">Product 6</rdfs:label>
        <Product_Available rdf:datatype="&xsd;string">0</Product_Available>
        <Product_ID rdf:datatype="&xsd;string">6</Product_ID>
        <Product_Product_Line rdf:datatype="&xsd;string">Active sensor</Product_Product_Line>
        <Product_ModelNo rdf:datatype="&xsd;string">B-1431</Product_ModelNo>
        <Product_Division rdf:datatype="&xsd;string">Control Engineering</Product_Division>
        <Product_SKU rdf:datatype="&xsd;string">KK3945</Product_SKU>
        <Product_Manufacture_Location rdf:datatype="&xsd;string">Seoul</Product_Manufacture_Location>
    </owl:NamedIndividual>



    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product7 -->

    <owl:NamedIndividual rdf:about="&mfg;Product7">
        <rdf:type rdf:resource="&mfg;Product"/>
        <rdfs:label rdf:datatype="&xsd;string">Product 7</rdfs:label>
        <Product_Available rdf:datatype="&xsd;string">100</Product_Available>
        <Product_ID rdf:datatype="&xsd;string">7</Product_ID>
        <Product_Division rdf:datatype="&xsd;string">Accessories</Product_Division>
        <Product_ModelNo rdf:datatype="&xsd;string">DBB-12</Product_ModelNo>
        <Product_Manufacture_Location rdf:datatype="&xsd;string">Hong Kong</Product_Manufacture_Location>
        <Product_Product_Line rdf:datatype="&xsd;string">Monitor</Product_Product_Line>
        <Product_SKU rdf:datatype="&xsd;string">ND5520</Product_SKU>
    </owl:NamedIndividual>



    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product8 -->

    <owl:NamedIndividual rdf:about="&mfg;Product8">
        <rdf:type rdf:resource="&mfg;Product"/>
        <rdfs:label rdf:datatype="&xsd;string">Product 8</rdfs:label>
        <Product_ID rdf:datatype="&xsd;string">8</Product_ID>
        <Product_SKU rdf:datatype="&xsd;string">Cleveland</Product_SKU>
        <Product_Available rdf:datatype="&xsd;string">HI4554</Product_Available>
        <Product_ModelNo rdf:datatype="&xsd;string">SP-1234</Product_ModelNo>
        <Product_Division rdf:datatype="&xsd;string">Safety</Product_Division>
        <Product_Product_Line rdf:datatype="&xsd;string">Safety</Product_Product_Line>
        <Product_Manufacture_Location rdf:datatype="&xsd;string">valve</Product_Manufacture_Location>
    </owl:NamedIndividual>



    <!-- http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product9 -->

    <owl:NamedIndividual rdf:about="&mfg;Product9">
        <rdf:type rdf:resource="&mfg;Product"/>
        <rdfs:label rdf:datatype="&xsd;string">Product 9</rdfs:label>
        <Product_ID rdf:datatype="&xsd;string">9</Product_ID>
        <Product_SKU rdf:datatype="&xsd;string">Cleveland</Product_SKU>
        <Product_Available rdf:datatype="&xsd;string">OP5333</Product_Available>
        <Product_ModelNo rdf:datatype="&xsd;string">SPX-1234</Product_ModelNo>
        <Product_Product_Line rdf:datatype="&xsd;string">Safety</Product_Product_Line>
        <Product_Division rdf:datatype="&xsd;string">Safety</Product_Division>
        <Product_Manufacture_Location rdf:datatype="&xsd;string">valve</Product_Manufacture_Location>
    </owl:NamedIndividual>
    <rdf:Description>
        <Product_ID></Product_ID>
    </rdf:Description>
</rdf:RDF>
Solution

  • In your data, there's a datatype property with the IRI http://www.workingontologist.org/Examples/Chapter3/Product.owl#Product_SKU. You can retrieve subjects and objects of that predicate with a SPARQL query like this:

    prefix mfg:   <http://www.workingontologist.org/Examples/Chapter3/Product.owl#>

select ?x ?y where {
  ?x mfg:Product_SKU ?y
}

    -------------------------------------------------------------------------
| x            | y                                                      |
=========================================================================
| mfg:Product9 | "Cleveland"^^<http://www.w3.org/2001/XMLSchema#string> |
| mfg:Product8 | "Cleveland"^^<http://www.w3.org/2001/XMLSchema#string> |
| mfg:Product7 | "ND5520"^^<http://www.w3.org/2001/XMLSchema#string>    |
| mfg:Product6 | "KK3945"^^<http://www.w3.org/2001/XMLSchema#string>    |
| mfg:Product5 | "CL5934"^^<http://www.w3.org/2001/XMLSchema#string>    |
| mfg:Product4 | "KS4520"^^<http://www.w3.org/2001/XMLSchema#string>    |
| mfg:Product3 | "IL4028"^^<http://www.w3.org/2001/XMLSchema#string>    |
| mfg:Product2 | "KD5243"^^<http://www.w3.org/2001/XMLSchema#string>    |
| mfg:Product1 | "FB3524"^^<http://www.w3.org/2001/XMLSchema#string>    |
-------------------------------------------------------------------------