--- a/ontology/ProvenanceOntology.owl	Tue Jul 03 10:20:46 2012 -0400
+++ b/ontology/ProvenanceOntology.owl	Tue Jul 03 10:38:48 2012 -0400
@@ -321,6 +321,7 @@
     <!-- 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>
@@ -1777,6 +1778,7 @@
     <!-- 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"/>

--- a/ontology/prov.ttl	Tue Jul 03 10:20:46 2012 -0400
+++ b/ontology/prov.ttl	Tue Jul 03 10:38:48 2012 -0400
@@ -395,6 +395,7 @@
 :Usage
     a owl:Class ;
     rdfs:comment "An instance of prov:Usage provides additional descriptions about the binary prov:used relation from some prov:Activity to an prov:Entity that it used. For example, :keynote prov:used :podium; prov:qualifiedUsage [ a prov:Usage; prov:entity :podium; :foo :bar ]."@en ;
+    rdfs:isDefinedBy <http://www.w3.org/ns/prov#> ;
     rdfs:label "Usage" ;
     rdfs:subClassOf :EntityInfluence, :InstantaneousEvent ;
     :category "qualified" ;
@@ -624,6 +625,7 @@
     a owl:ObjectProperty ;
     rdfs:comment "The _optional_ Generation involved in an Entity's Derivation."@en ;
     rdfs:domain :Derivation ;
+    rdfs:isDefinedBy <http://www.w3.org/ns/prov#> ;
     rdfs:label "hadGeneration" ;
     rdfs:range :Generation ;
     :category "qualified" ;