_:vb51100089	<http://www.w3.org/ns/r2rml#datatype>	<http://www.w3.org/2001/XMLSchema#string> .
_:vb51100089	<http://www.openlinksw.com/schemas/virtrdf#bnode-row>	"67" .
_:vb51100089	<http://www.w3.org/ns/r2rml#column>	"first_name" .