added description to constraint example - not all apply; only one.
--- a/ontology/components/hadParticipant/prov-dm-constraint-participation.ttl	Sun Nov 06 12:21:52 2011 -0500
+++ b/ontology/components/hadParticipant/prov-dm-constraint-participation.ttl	Sun Nov 06 12:23:09 2011 -0500
@@ -24,6 +24,12 @@
    prov:hadParticipant :e1;
 .
 
+:e
+   rdfs:seeAlso <http://www.w3.org/TR/2011/WD-prov-dm-20111018/#expression-Participation>;
+   dcterms:description "hadParticipant(pe,e) holds if and only if:";
+   a prov:Entity;
+.
+
 :e1
    rdfs:seeAlso <http://www.w3.org/TR/2011/WD-prov-dm-20111018/#expression-Participation>;
    dcterms:description "wasComplementOf(e1,e) holds for some entity expression identified by e1, and hadParticipant(pe,e1) holds some process execution expression identified by pe.";