--- a/examples/eg-24-prov-o-html-examples/rdf/create/rdf/property_wasDerivedFrom.ttl	Mon Jul 09 17:03:56 2012 -0400
+++ b/examples/eg-24-prov-o-html-examples/rdf/create/rdf/property_wasDerivedFrom.ttl	Mon Jul 09 17:06:34 2012 -0400
@@ -2,13 +2,14 @@
 @prefix xsd:  <http://www.w3.org/2001/XMLSchema#> .
 @prefix owl:  <http://www.w3.org/2002/07/owl#> .
 @prefix prov: <http://www.w3.org/ns/prov#> .
+@prefix ex:   <http://example.com/vocab#> .
 @prefix :     <http://example.com/> .
 
 :bar_chart 
-   a prov:Entity;
+   a prov:Entity, ex:Barchart;
    prov:wasDerivedFrom :aggregatedByRegions;
 .
 
 :aggregatedByRegions
-   a prov:Entity;
+   a prov:Entity, ex:Dataset;
 .