--- a/ontology/prov.ttl	Tue Jul 03 10:20:41 2012 -0400
+++ b/ontology/prov.ttl	Tue Jul 03 10:20:46 2012 -0400
@@ -395,7 +395,6 @@
 :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" ;
@@ -625,7 +624,6 @@
     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" ;