--- a/ontology/ProvenanceOntology.owl	Fri Feb 24 00:00:24 2012 -0500
+++ b/ontology/ProvenanceOntology.owl	Fri Feb 24 00:45:00 2012 -0500
@@ -238,6 +238,14 @@
     
 
 
+    <!-- http://www.w3.org/ns/prov#hadTemporalExtent -->
+
+    <owl:ObjectProperty rdf:about="&prov;hadTemporalExtent">
+        <rdfs:range rdf:resource="&prov;TemporalEntity"/>
+    </owl:ObjectProperty>
+    
+
+
     <!-- http://www.w3.org/ns/prov#hasAnnotation -->
 
     <owl:ObjectProperty rdf:about="&prov;hasAnnotation">
@@ -820,9 +828,18 @@
     
 
 
+    <!-- http://www.w3.org/ns/prov#TemporalEntity -->
+
+    <owl:Class rdf:about="&prov;TemporalEntity">
+        <rdfs:comment>Either an instant or an interval.</rdfs:comment>
+    </owl:Class>
+    
+
+
     <!-- http://www.w3.org/ns/prov#TimeInstant -->
 
     <owl:Class rdf:about="&prov;TimeInstant">
+        <rdfs:subClassOf rdf:resource="&prov;TemporalEntity"/>
         <rdfs:comment xml:lang="en">&#39;Instants are, intuitively, point-like in that they have no interior points&#39;
 reusing notion from W3C OWL-Time Working Draft (http://www.w3.org/TR/owl-time/), but not associating to it directly because it is not a Recommendation.</rdfs:comment>
         <rdfs:seeAlso rdf:resource="http://www.w3.org/2011/prov/wiki/ProvRDF#Activity"/>
@@ -833,6 +850,14 @@
     
 
 
+    <!-- http://www.w3.org/ns/prov#TimeInterval -->
+
+    <owl:Class rdf:about="&prov;TimeInterval">
+        <rdfs:subClassOf rdf:resource="&prov;TemporalEntity"/>
+    </owl:Class>
+    
+
+
     <!-- http://www.w3.org/ns/prov#Trace -->
 
     <owl:Class rdf:about="&prov;Trace">