_:vb50966705	<http://www.w3.org/ns/r2rml#column>	"LastName" .
_:vb50966703	<http://www.w3.org/ns/r2rml#constant>	<http://demo.openlinksw.com/schemas/NorthwindDemo/lastname> .
_:vb50966704	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb50966703 .
_:vb50966704	<http://www.w3.org/ns/r2rml#objectMap>	_:vb50966705 .