<?xml version="1.0"?>
<!DOCTYPE rdf:RDF [
     <!ENTITY rdf    "http://www.w3.org/1999/02/22-rdf-syntax-ns#" >
     <!ENTITY rdfs   "http://www.w3.org/2000/01/rdf-schema#" >
     <!ENTITY xsd    "http://www.w3.org/2001/XMLSchema#" >
     <!ENTITY owl    "http://www.w3.org/2002/07/owl#" >
     <!ENTITY topic  "http://daml.umbc.edu/ontologies/ittalks/topic#" >
   ]>


<rdf:RDF
  xmlns:rdf 	="&rdf;"
  xmlns:rdfs	="&rdfs;"
  xmlns:owl 	="&owl;"
  xmlns:topic 	="&topic;"
  xmlns     	="&topic;"
  xml:base    	="http://daml.umbc.edu/ontologies/ittalks/topic"
>

<owl:Ontology rdf:about="">
  <owl:versionInfo>$Revision: 1.0 $</owl:versionInfo>
  <rdfs:comment>
	This ontology describes a topic and related properties.

	This ontology is created by 
		Li Ding -- http://www.csee.umbc.edu/~dingli1/,
	        Harry Chen -- http://www.csee.umbc.edu/~hchen4/,
		Lalana Kagal -- http://www.cs.umbc.edu/~lkagal1/, 
		Tim Finin -- http://www.csee.umbc.edu/~finin/. 
  </rdfs:comment>
</owl:Ontology>



<!-- Class Topic -->

<owl:Class rdf:ID="Topic">
  <rdfs:label>Topic</rdfs:label>
  <rdfs:comment>An abstract topic </rdfs:comment>
</owl:Class>


<owl:ObjectProperty rdf:ID="subTopic">
  <rdfs:domain rdf:resource="#Topic"/>
  <rdfs:range rdf:resource="#Topic"/>
</owl:ObjectProperty>

<owl:ObjectProperty rdf:ID="superTopic">
  <rdfs:domain rdf:resource="#Topic"/>
  <rdfs:range rdf:resource="#Topic"/>
</owl:ObjectProperty>

<owl:DatatypeProperty rdf:ID="keyword">
  <rdfs:domain rdf:resource="#Topic"/>
  <rdfs:range rdf:resource="#String"/>
</owl:DatatypeProperty>

</rdf:RDF>
