_:vb50966719	<http://www.w3.org/ns/r2rml#objectMap>	_:vb50966720 .
_:vb50966718	<http://www.w3.org/ns/r2rml#constant>	<http://demo.openlinksw.com/schemas/NorthwindDemo/hiredate> .
_:vb50966719	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb50966718 .
_:vb50966720	<http://www.w3.org/ns/r2rml#column>	"HireDate" .