@prefix owl:	<http://www.w3.org/2002/07/owl#> .
@prefix ns1:	<http://www.openlinksw.com/schemas/googleplus#> .
@prefix vcard:	<http://www.w3.org/2001/vcard-rdf/3.0#> .
ns1:date_of_birth	owl:equivalentProperty	vcard:BDAY .
@prefix ns3:	<http://www.openlinksw.com/schemas/linkedin#> .
ns3:date_of_birth	owl:equivalentProperty	vcard:BDAY .
@prefix ns4:	<http://www.openlinksw.com/schemas/opengraph#> .
ns4:birthday	owl:equivalentProperty	vcard:BDAY .