_:vb50968220	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb50968219 .
_:vb50968220	<http://www.w3.org/ns/r2rml#objectMap>	_:vb50968221 .
_:vb50968221	<http://www.w3.org/ns/r2rml#column>	"LastName" .
_:vb50968219	<http://www.w3.org/ns/r2rml#constant>	<http://demo.openlinksw.com/schemas/NorthwindQA/lastname> .