--- a/ontology/ProvenanceOntology.owl	Mon Mar 12 20:10:04 2012 -0400
+++ b/ontology/ProvenanceOntology.owl	Mon Mar 12 21:30:29 2012 -0400
@@ -561,6 +561,7 @@
     <owl:ObjectProperty rdf:about="&prov;wasEndedBy">
         <prov:category>simple</prov:category>
         <rdfs:seeAlso rdf:resource="http://www.w3.org/2011/prov/wiki/ProvRDF#Ending"/>
+        <rdfs:domain rdf:resource="&prov;Activity"/>
         <prov:qualifiedForm rdf:resource="&prov;End"/>
         <prov:qualifiedForm rdf:resource="&prov;qualifiedEnd"/>
         <rdfs:subPropertyOf rdf:resource="&prov;wasAssociatedWith"/>
@@ -636,6 +637,7 @@
     <owl:ObjectProperty rdf:about="&prov;wasStartedBy">
         <prov:category>simple</prov:category>
         <rdfs:seeAlso rdf:resource="http://www.w3.org/2011/prov/wiki/ProvRDF#Starting"/>
+        <rdfs:domain rdf:resource="&prov;Activity"/>
         <prov:qualifiedForm rdf:resource="&prov;Start"/>
         <prov:qualifiedForm rdf:resource="&prov;qualifiedStart"/>
         <rdfs:subPropertyOf rdf:resource="&prov;wasAssociatedWith"/>