--- a/ontology/ProvenanceOntology.owl	Mon Mar 12 19:53:00 2012 -0400
+++ b/ontology/ProvenanceOntology.owl	Mon Mar 12 20:10:04 2012 -0400
@@ -914,7 +914,7 @@
 
     <owl:Class rdf:about="&prov;Organization">
         <rdfs:subClassOf rdf:resource="&prov;Agent"/>
-        <prov:category>additional</prov:category>
+        <prov:category>simple</prov:category>
         <rdfs:seeAlso rdf:resource="http://www.w3.org/2011/prov/wiki/ProvRDF#Organization"/>
     </owl:Class>
     
@@ -924,7 +924,7 @@
 
     <owl:Class rdf:about="&prov;Person">
         <rdfs:subClassOf rdf:resource="&prov;Agent"/>
-        <prov:category>additional</prov:category>
+        <prov:category>simple</prov:category>
         <rdfs:seeAlso rdf:resource="http://www.w3.org/2011/prov/wiki/ProvRDF#Person"/>
     </owl:Class>
     
@@ -989,7 +989,7 @@
 
     <owl:Class rdf:about="&prov;SoftwareAgent">
         <rdfs:subClassOf rdf:resource="&prov;Agent"/>
-        <prov:category>additional</prov:category>
+        <prov:category>simple</prov:category>
         <rdfs:seeAlso rdf:resource="http://www.w3.org/2011/prov/wiki/ProvRDF#SoftwareAgent"/>
     </owl:Class>