--- a/examples/eg-24-prov-o-html-examples/rdf/create/rdf/property_hadOriginalSource.ttl	Tue Apr 24 17:10:55 2012 +0200
+++ b/examples/eg-24-prov-o-html-examples/rdf/create/rdf/property_hadOriginalSource.ttl	Tue Apr 24 17:11:13 2012 +0200
@@ -4,4 +4,15 @@
 @prefix prov: <http://www.w3.org/ns/prov#> .
 @prefix :     <http://example.com/> .
 
-# TODO
+### a particular case of derivation
+
+:myPost 
+        a prov:Entity;
+        prov:hadOriginalSource :donQuixote;
+        prov:qualifiedSource [
+                a prov:Source;
+                prov:entity :donQuixote;
+                #other attributes of the relationship
+        ].
+        
+:donQuixote a prov:Entity.

--- a/ontology/ProvenanceOntology.owl	Tue Apr 24 17:10:55 2012 +0200
+++ b/ontology/ProvenanceOntology.owl	Tue Apr 24 17:11:13 2012 +0200
@@ -310,6 +310,7 @@
         <prov:category>expanded</prov:category>
         <rdfs:range rdf:resource="&prov;Entity"/>
         <rdfs:domain rdf:resource="&prov;Entity"/>
+	<rdfs:comment xml:lang="en">An original source refers to the source material that is closest to the person, information, period, or idea being studied. An original source relation is a particular case of derivation that aims to give credit to the source that originated some information.</rdfs:comment>
         <prov:qualifiedForm rdf:resource="&prov;Source"/>
         <prov:qualifiedForm rdf:resource="&prov;qualifiedSource"/>
         <rdfs:subPropertyOf rdf:resource="&prov;wasDerivedFrom"/>