_:vb51209832	<http://www.w3.org/ns/r2rml#predicate>	<http://schema.org/orderItemNumber> .
_:vb51209833	<http://www.w3.org/ns/r2rml#column>	"ProductID" .
_:vb51209832	<http://www.w3.org/ns/r2rml#objectMap>	_:vb51209833 .
_:vb51209832	<http://www.w3.org/ns/r2rml#graph>	<http://demo.openlinksw.com/schemas/claude_northwind#graph> .