_:vb51208643	<http://www.w3.org/ns/r2rml#predicate>	<http://schema.org/orderItemNumber> .
_:vb51208643	<http://www.w3.org/ns/r2rml#graphMap>	_:vb51208645 .
_:vb51208645	<http://www.w3.org/ns/r2rml#constant>	<http://demo.openlinksw.com/schemas/claude_northwind#graph> .
_:vb51208643	<http://www.w3.org/ns/r2rml#objectMap>	_:vb51208644 .
_:vb51208644	<http://www.w3.org/ns/r2rml#column>	"ProductID" .