--- a/ontology/ProvenanceOntology.owl	Fri Oct 21 11:38:45 2011 +0100
+++ b/ontology/ProvenanceOntology.owl	Fri Oct 21 11:53:00 2011 +0100
@@ -99,6 +99,19 @@
     
 
 
+    <!-- http://www.w3.org/ns/prov-o/assumedRole -->
+
+    <owl:ObjectProperty rdf:about="http://www.w3.org/ns/prov-o/assumedRole">
+        <rdf:type rdf:resource="&owl;AsymmetricProperty"/>
+        <rdf:type rdf:resource="&owl;IrreflexiveProperty"/>
+        <rdfs:label xml:lang="en">assumed role</rdfs:label>
+        <rdfs:domain rdf:resource="http://www.w3.org/ns/prov-o/EntityInRole"/>
+        <rdfs:range rdf:resource="http://www.w3.org/ns/prov-o/Role"/>
+        <rdfs:subPropertyOf rdf:resource="http://www.w3.org/ns/prov-o/wasComplementOf"/>
+    </owl:ObjectProperty>
+    
+
+
     <!-- http://www.w3.org/ns/prov-o/assumedRoleAt -->
 
     <owl:ObjectProperty rdf:about="http://www.w3.org/ns/prov-o/assumedRoleAt">
@@ -482,6 +495,14 @@
     
 
 
+    <!-- http://www.w3.org/ns/prov-o/Role -->
+
+    <owl:Class rdf:about="http://www.w3.org/ns/prov-o/Role">
+        <rdfs:label xml:lang="en">Role</rdfs:label>
+    </owl:Class>
+    
+
+
     <!-- http://www.w3.org/ns/prov-o/Time -->
 
     <owl:Class rdf:about="http://www.w3.org/ns/prov-o/Time">