--- a/examples/eg-24-prov-o-html-examples/rdf/create/rdf/property_wasDerivedFrom.ttl	Mon Jul 09 16:59:46 2012 -0400
+++ b/examples/eg-24-prov-o-html-examples/rdf/create/rdf/property_wasDerivedFrom.ttl	Mon Jul 09 17:03:56 2012 -0400
@@ -4,4 +4,11 @@
 @prefix prov: <http://www.w3.org/ns/prov#> .
 @prefix :     <http://example.com/> .
 
-:bar_chart prov:wasDerivedFrom :aggregatedByRegions .
+:bar_chart 
+   a prov:Entity;
+   prov:wasDerivedFrom :aggregatedByRegions;
+.
+
+:aggregatedByRegions
+   a prov:Entity;
+.