[protege-owl] OWL Representation of Subclasses

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[protege-owl] OWL Representation of Subclasses

whetzel-2
Hi,

I have seen 2 ways in which a subclass is represented in OWL, generated
using Protege/OWL, and was wondering why this occurs. One representation
is:
<rdfs:subClassOf rdf:resource="#ExperimentDesignType"/>

while the other is:
<rdfs:subClassOf>
       <owl:Class rdf:about="#ExperimentDesignType"/>
     </rdfs:subClassOf>

The relevant parts of the file are shown below.

Thanks,
Trish

----------
<owl:Class rdf:ID="BiologicalProperty">
     <class_source rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
     >ontology</class_source>
     <rdfs:comment rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
     >A biological property experiment design type is where an intrinsic
characteristic of an organism(s) or biological system is
examined.</rdfs:comment>
     <rdfs:subClassOf rdf:resource="#ExperimentDesignType"/>
     <class_role rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
     >concrete</class_role>
   </owl:Class>


<owl:Class rdf:ID="EpidemiologicalDesign">
     <class_role rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
     >concrete</class_role>
     <rdfs:subClassOf>
       <owl:Class rdf:about="#ExperimentDesignType"/>
     </rdfs:subClassOf>
     <class_source rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
     >ontology</class_source>
     <rdfs:comment rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
     >An epidemiological experiment design type is where the biosource
history is studied e.g. environmental, clinical and family
history.</rdfs:comment>
   </owl:Class>
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