_:vb51208641	<http://www.w3.org/ns/r2rml#class>	<http://schema.org/OrderItem> .
_:vb51208641	<http://www.w3.org/ns/r2rml#graphMap>	_:vb51208642 .
_:vb51208642	<http://www.w3.org/ns/r2rml#constant>	<http://demo.openlinksw.com/schemas/claude_northwind#graph> .
_:vb51208641	<http://www.w3.org/ns/r2rml#template>	"http://demo.openlinksw.com/schemas/claude_northwind/orderitem/{OrderID}/{ProductID}" .