--- a/ontology/ProvenanceOntology.owl	Mon Apr 02 14:51:13 2012 +0100
+++ b/ontology/ProvenanceOntology.owl	Mon Apr 02 14:56:24 2012 +0100
@@ -180,8 +180,8 @@
     <!-- http://www.w3.org/ns/prov#derivedByInsertionFrom -->
 
     <owl:ObjectProperty rdf:about="&prov;derivedByInsertionFrom">
+        <rdfs:comment xml:lang="en">The collection was derived from the other by insertion. prov:qualifiedInsertion shows details of the insertion, in particular the inserted key-value pairs.</rdfs:comment>
         <prov:component>collections</prov:component>
-        <rdfs:comment xml:lang="en">The collection was derived from the other by insertion. prov:qualifiedInsertion shows details of the insertion, in particular the inserted key-value pairs.</rdfs:comment>
         <prov:category>collections</prov:category>
         <rdfs:domain rdf:resource="&prov;Collection"/>
         <rdfs:range rdf:resource="&prov;Collection"/>
@@ -1007,7 +1007,6 @@
 
     <owl:Class rdf:about="&prov;Agent">
         <rdfs:label>Agent</rdfs:label>
-        <rdfs:subClassOf rdf:resource="&owl;Thing"/>
         <prov:definition>An agent is a type of entity that bears some form of responsibility for an activity taking place.</prov:definition>
         <prov:prov-dm-constraints>http://dvcs.w3.org/hg/prov/raw-file/default/model/prov-dm-constraints.html#term-Agent</prov:prov-dm-constraints>
         <prov:prov-n>http://dvcs.w3.org/hg/prov/raw-file/default/model/prov-n.html#expression-Agent</prov:prov-n>