_:vb50780119	<http://www.w3.org/ns/r2rml#objectMap>	_:vb50780120 .
_:vb50780120	<http://www.w3.org/ns/r2rml#column>	"first_name" .
_:vb50780118	<http://www.w3.org/ns/r2rml#constant>	<http://demo.openlinksw.com/schemas/aml/firstName> .
_:vb50780119	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb50780118 .