--- a/ontology/examples/ontology-extensions/workflow/workflow.ttl	Tue Sep 27 17:59:34 2011 +0100
+++ b/ontology/examples/ontology-extensions/workflow/workflow.ttl	Tue Sep 27 17:59:46 2011 +0100
@@ -79,9 +79,7 @@
     # or using sub-properties
     wf:wasLaunchedBy :aUser ;
     wf:ranInWorkflowEngine :workflowEngine ;
-    # TODO: Roles for agents?
-
-    prov:used [ prov:Entity, prov2:EntityInRole, wf:ValueAtPort ;
+    prov:used [ a prov:Entity, prov2:EntityInRole, wf:ValueAtPort ;
         # role-as-complement-of syntax
         # http://lists.w3.org/Archives/Public/public-prov-wg/2011Sep/0170.html
         prov:wasComplementOf :input ;