OWL Example

<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
         xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
         xmlns:owl="http://www.w3.org/2002/07/owl#"
         xmlns="http://www.xfront.com/owl/ontologies/camera/#"
         xmlns:camera="http://www.xfront.com/owl/ontologies/camera/#"
         xml:base="http://www.xfront.com/owl/ontologies/camera/">

    <owl:Ontology rdf:about="">
        <rdfs:comment>
        Camera OWL Ontology                           
      Author: Roger L. Costello                                   
        </rdfs:comment>
    </owl:Ontology>

     <owl:Class rdf:ID="Money">
          <rdfs:subClassOf rdf:resource="http://www.w3.org/2002/07/owl#Thing"/>
     </owl:Class>

     <owl:DatatypeProperty rdf:ID="currency">
          <rdfs:domain rdf:resource="#Money"/>
          <rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#string"/>
     </owl:DatatypeProperty>

     <owl:Class rdf:ID="Range">
          <rdfs:subClassOf rdf:resource="http://www.w3.org/2002/07/owl#Thing"/>
     </owl:Class>

     <owl:DatatypeProperty rdf:ID="min">
          <rdfs:domain rdf:resource="#Range"/>
          <rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#float"/>
     </owl:DatatypeProperty>

     <owl:DatatypeProperty rdf:ID="max">
          <rdfs:domain rdf:resource="#Range"/>
          <rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#float"/>
     </owl:DatatypeProperty>

     <owl:DatatypeProperty rdf:ID="units">
          <rdfs:domain rdf:resource="#Range"/>
          <rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#string"/>
     </owl:DatatypeProperty>

     <owl:Class rdf:ID="Window">
          <rdfs:subClassOf rdf:resource="http://www.w3.org/2002/07/owl#Thing"/>
     </owl:Class>

     <camera:Window rdf:ID="ThroughTheLens"/>
     <camera:Window rdf:ID="WindowOnTopOfCamera"/>

     <owl:Class rdf:ID="Viewer">
         <owl:oneOf rdf:parseType="Collection">
               <camera:Window rdf:about="#ThroughTheLens"/>
               <camera:Window rdf:about="#WindowOnTopOfCamera"/>
          </owl:oneOf>
     </owl:Class>

     <owl:Class rdf:ID="PurchaseableItem">
          <rdfs:subClassOf rdf:resource="http://www.w3.org/2002/07/owl#Thing"/>
     </owl:Class>

     <owl:ObjectProperty rdf:ID="cost">
          <rdfs:domain rdf:resource="#PurchaseableItem"/>
          <rdfs:range rdf:resource="#Money"/>
     </owl:ObjectProperty>

     <owl:Class rdf:ID="Body">
          <rdfs:subClassOf rdf:resource="#PurchaseableItem"/>
     </owl:Class>

     <owl:Class rdf:ID="BodyWithNonAdjustableShutterSpeed">
          <owl:intersectionOf rdf:parseType="Collection">
               <owl:Class rdf:about="#Body"/>
               <owl:Restriction>
                     <owl:onProperty rdf:resource="#shutter-speed"/>
                     <owl:cardinality>0</owl:cardinality>
               </owl:Restriction>
          </owl:intersectionOf>
     </owl:Class>

     <owl:Class rdf:ID="Lens">
          <rdfs:subClassOf rdf:resource="#PurchaseableItem"/>
     </owl:Class>

     <owl:Class rdf:ID="Camera">
          <rdfs:subClassOf rdf:resource="#PurchaseableItem"/>
     </owl:Class>

     <owl:Class rdf:ID="SLR">
          <owl:intersectionOf rdf:parseType="Collection">
               <owl:Class rdf:about="#Camera"/>
               <owl:Restriction>
                     <owl:onProperty rdf:resource="#viewFinder"/>
                     <owl:hasValue rdf:resource="#ThroughTheLens"/>
               </owl:Restriction>
          </owl:intersectionOf>
     </owl:Class>

     <owl:Class rdf:ID="Large-Format">
          <rdfs:subClassOf rdf:resource="#Camera"/>
          <rdfs:subClassOf>
               <owl:Restriction>
                     <owl:onProperty rdf:resource="#body"/>
                     <owl:allValuesFrom rdf:resource="#BodyWithNonAdjustableShutterSpeed"/>
               </owl:Restriction>
          </rdfs:subClassOf>
     </owl:Class>

     <owl:Class rdf:ID="Digital">
          <rdfs:subClassOf rdf:resource="#Camera"/>
     </owl:Class>

     <owl:ObjectProperty rdf:ID="part"/>

     <owl:ObjectProperty rdf:ID="lens">
          <rdfs:subPropertyOf rdf:resource="#part"/>
          <rdfs:domain rdf:resource="#Camera"/>
          <rdfs:range rdf:resource="#Lens"/>
     </owl:ObjectProperty>

     <owl:ObjectProperty rdf:ID="body">
          <rdfs:subPropertyOf rdf:resource="#part"/>
          <rdfs:domain rdf:resource="#Camera"/>
          <rdfs:range rdf:resource="#Body"/>
     </owl:ObjectProperty>

     <owl:ObjectProperty rdf:ID="viewFinder">
          <rdf:type rdf:resource="http://www.w3.org/2002/07/owl#FunctionalProperty"/>
          <rdfs:domain rdf:resource="#Camera"/>
          <rdfs:range rdf:resource="#Viewer"/>
     </owl:ObjectProperty>

     <owl:DatatypeProperty rdf:ID="size">
          <rdfs:domain rdf:resource="#Lens"/>
          <rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#string"/>
     </owl:DatatypeProperty>

     <owl:DatatypeProperty rdf:ID="aperture">
          <rdfs:domain rdf:resource="#Lens"/>
          <rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#string"/>
     </owl:DatatypeProperty>

     <owl:ObjectProperty rdf:ID="compatibleWith">
          <rdfs:domain rdf:resource="#Lens"/>
          <rdfs:range rdf:resource="#Body"/>
     </owl:ObjectProperty>

     <owl:ObjectProperty rdf:ID="shutter-speed">
          <rdfs:domain rdf:resource="#Body"/>
          <rdfs:range rdf:resource="#Range"/>
     </owl:ObjectProperty>

     <owl:DatatypeProperty rdf:ID="focal-length">
          <owl:equivalentProperty rdf:resource="#size"/>
          <rdfs:domain rdf:resource="#Lens"/>
          <rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#string"/>
     </owl:DatatypeProperty>

     <owl:DatatypeProperty rdf:ID="f-stop">
          <owl:equivalentProperty rdf:resource="#aperture"/>
          <rdfs:domain rdf:resource="#Lens"/>
          <rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#string"/>
     </owl:DatatypeProperty>

</rdf:RDF>