@prefix owl:	<http://www.w3.org/2002/07/owl#> .
@prefix ns1:	<http://www.openlinksw.com/schemas/opengraph#> .
@prefix foaf:	<http://xmlns.com/foaf/0.1/> .
ns1:last_name	owl:equivalentProperty	foaf:lastName .
@prefix vcard:	<http://www.w3.org/2001/vcard-rdf/3.0#> .
ns1:last_name	owl:equivalentProperty	vcard:Family .