Protege does not like relative references in owl:import ..
--- a/examples/eg-24-prov-o-html-examples/rdf/create/merged-header.ttl Mon Jul 02 22:42:49 2012 +0100
+++ b/examples/eg-24-prov-o-html-examples/rdf/create/merged-header.ttl Mon Jul 02 22:47:34 2012 +0100
@@ -4,7 +4,7 @@
@base <http://dvcs.w3.org/hg/prov/raw-file/tip/examples/rdf/create/> .
-<>
+<merged.ttl>
a owl:Ontology;
- owl:imports <../../../ontology/ProvenanceOntology.owl> .
+ owl:imports <http://dvcs.w3.org/hg/prov/raw-file/tip/ontology/ProvenanceOntology.owl> .