--- a/ontology/ProvenanceOntology.owl	Fri Apr 20 12:21:24 2012 -0400
+++ b/ontology/ProvenanceOntology.owl	Fri Apr 20 12:37:44 2012 -0400
@@ -51,8 +51,8 @@
         <rdfs:subPropertyOf rdf:resource="&rdfs;seeAlso"/>
     </owl:AnnotationProperty>
     <owl:AnnotationProperty rdf:about="&prov;definition"/>
+    <owl:AnnotationProperty rdf:about="&rdfs;label"/>
     <owl:AnnotationProperty rdf:about="&prov;editorialNote"/>
-    <owl:AnnotationProperty rdf:about="&rdfs;label"/>
     <owl:AnnotationProperty rdf:about="&prov;inverse"/>
     <owl:AnnotationProperty rdf:about="&rdfs;comment"/>
     <owl:AnnotationProperty rdf:about="&rdfs;seeAlso"/>
@@ -941,6 +941,30 @@
     
 
 
+    <!-- http://www.w3.org/ns/prov#generatedAtTime -->
+
+    <owl:DatatypeProperty rdf:about="&prov;generatedAtTime">
+        <prov:component>entities-activities</prov:component>
+        <prov:category>starting-point</prov:category>
+        <rdfs:comment xml:lang="en">The time at which an entity was completely created.</rdfs:comment>
+        <rdfs:range rdf:resource="&xsd;dateTime"/>
+        <rdfs:domain rdf:resource="&prov;Entity"/>
+    </owl:DatatypeProperty>
+    
+
+
+    <!-- http://www.w3.org/ns/prov#invalidatedAtTime -->
+
+    <owl:DatatypeProperty rdf:about="&prov;invalidatedAtTime">
+        <rdfs:comment xml:lang="en">The time at which the entity began to be invalidated.</rdfs:comment>
+        <prov:component>entities-activities</prov:component>
+        <prov:category>starting-point</prov:category>
+        <rdfs:range rdf:resource="&xsd;dateTime"/>
+        <rdfs:domain rdf:resource="&prov;Entity"/>
+    </owl:DatatypeProperty>
+    
+
+
     <!-- http://www.w3.org/ns/prov#key -->
 
     <owl:DatatypeProperty rdf:about="&prov;key">