Dear All, I am just new to this list. Please see http://cidoc.ics.forth.gr. I have carried out a comparison of OpenGIS and the CIDOC CRM, that may find your interest. Please see: http://cidoc.ics.forth.gr/crm_documents.html http://cidoc.ics.forth.gr/docs/opengis_map.doc" and http://www.opengis.org/ http://cidoc.ics.forth.gr/ best regards, Martin