--- a/examples/eg-24-prov-o-html-examples/rdf/create/rdf/class_Involvement.ttl	Tue Jun 05 12:52:56 2012 -0400
+++ b/examples/eg-24-prov-o-html-examples/rdf/create/rdf/class_Involvement.ttl	Tue Jun 05 12:59:11 2012 -0400
@@ -21,6 +21,9 @@
         prov:AgentInvolvement, # Inferred
         prov:Involvement;      # Inferred
       prov:agent   :bob;       # The object of :wasConductedBy
-      prov:hadRole :Surgeon;
+      prov:hadRole :surgeon;
    ];
 .
+
+:bob       a prov:Agent .
+my:surgeon a prov:Role .