--- a/ontology/ProvenanceOntology.owl	Fri Oct 21 11:29:34 2011 +0100
+++ b/ontology/ProvenanceOntology.owl	Fri Oct 21 11:38:45 2011 +0100
@@ -24,7 +24,6 @@
         <rdfs:comment xml:lang="en">This document is published by the Provenance Working Group (http://www.w3.org/2011/prov/wiki/Main_Page). 
 
 If you wish to make comments regarding this document, please send them to public-prov-wg@w3.org (subscribe, archives). All feedback is welcome.</rdfs:comment>
-        <rdfs:seeAlso rdf:resource="Overview.html"/>
         <rdfs:seeAlso rdf:resource="http://www.w3.org/TR/prov-o/"/>
     </owl:Ontology>
     
@@ -427,6 +426,12 @@
     <owl:Class rdf:about="http://www.w3.org/ns/prov-o/EntityInRole">
         <rdfs:label xml:lang="en">Entity In Role</rdfs:label>
         <rdfs:subClassOf rdf:resource="http://www.w3.org/ns/prov-o/Entity"/>
+        <rdfs:subClassOf>
+            <owl:Restriction>
+                <owl:onProperty rdf:resource="http://www.w3.org/ns/prov-o/assumedBy"/>
+                <owl:someValuesFrom rdf:resource="&owl;Thing"/>
+            </owl:Restriction>
+        </rdfs:subClassOf>
         <rdfs:comment xml:lang="en">Entity in role is defined to be &quot;a function assumed by a entity or an agent.&quot;</rdfs:comment>
     </owl:Class>