--- a/examples/eg-24-prov-o-html-examples/rdf/create/rdf/class_Usage.ttl	Tue Apr 24 14:34:06 2012 +0100
+++ b/examples/eg-24-prov-o-html-examples/rdf/create/rdf/class_Usage.ttl	Tue Apr 24 14:50:00 2012 +0100
@@ -9,13 +9,25 @@
 	  prov:atTime     "2011-07-16T01:52:02Z"^^xsd:dateTime; 
       prov:qualifiedUsage [
          a prov:Usage;
-         prov:entity    :datasetA;
-         prov:hadRole   :inputToBeSorted;          
+         prov:entity    :datasetA; ## the entity used by the prov:Usage
+         prov:hadRole   :inputToBeSorted;  ## the role of the entity in this prov:Usage        
       ];
 	  prov:generated :datasetB;
    .
 :datasetA a prov:Entity.
 :datasetB a prov:Entity.
 :inputToBeSorted a prov:Role.  
+
+#### expressing the above using starting-point terms
+#### the role of :datasetA cannot be expressed
+
+:sortActivity
+      a prov:Activity;
+      prov:atTime     "2011-07-16T01:52:02Z"^^xsd:dateTime;
+      prov:used	      :datasetA;
+      prov:generated  :datasetB;
+.
+
+