--- a/ontology/ProvenanceOntology.owl	Tue Jul 03 10:16:53 2012 -0400
+++ b/ontology/ProvenanceOntology.owl	Tue Jul 03 10:20:41 2012 -0400
@@ -321,7 +321,6 @@
     <!-- http://www.w3.org/ns/prov#hadGeneration -->
 
     <owl:ObjectProperty rdf:about="http://www.w3.org/ns/prov#hadGeneration">
-        <rdfs:isDefinedBy rdf:resource="http://www.w3.org/ns/prov#"/>
         <rdfs:label>hadGeneration</rdfs:label>
         <inverse>generatedAsDerivation</inverse>
         <category>qualified</category>
@@ -1778,7 +1777,6 @@
     <!-- http://www.w3.org/ns/prov#Usage -->
 
     <owl:Class rdf:about="http://www.w3.org/ns/prov#Usage">
-        <rdfs:isDefinedBy rdf:resource="http://www.w3.org/ns/prov#"/>
         <rdfs:label>Usage</rdfs:label>
         <rdfs:subClassOf rdf:resource="http://www.w3.org/ns/prov#EntityInfluence"/>
         <rdfs:subClassOf rdf:resource="http://www.w3.org/ns/prov#InstantaneousEvent"/>