_:vb50968231	<http://www.w3.org/ns/r2rml#constant>	<http://demo.openlinksw.com/schemas/NorthwindQA/birthdate> .
_:vb50968232	<http://www.w3.org/ns/r2rml#objectMap>	_:vb50968233 .
_:vb50968233	<http://www.w3.org/ns/r2rml#column>	"BirthDate" .
_:vb50968232	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb50968231 .