CIDOC-CRM in RDF Application profile
+Motivation
+CRM classes and properties do not fully map to RDF classes and properties. CRM is not an ontology by an abstract data model.
+CRM Classes to avoid
+CRM Classes to use with caution
+E42 Identifier
+Don’t use E42_Identifier for identifier for URIs. So use
+<something> crm:P1_is_identified_by <http://example.org/> .
+instead of
+<something> crm:P1_is_identified_by [ a crm:E42_Identifier ; crm:P90_has_value "http://example.org/" ] .
+