_:vb50809601	<http://www.w3.org/ns/r2rml#objectMap>	_:vb50809603 .
_:vb50809601	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb50809602 .
_:vb50809602	<http://www.w3.org/ns/r2rml#constant>	<http://demo.openlinksw.com/schemas/nfl#ismeasurement> .
_:vb50809603	<http://www.w3.org/ns/r2rml#datatype>	<http://www.w3.org/2001/XMLSchema#boolean> .
_:vb50809603	<http://www.w3.org/ns/r2rml#column>	"IsMeasurement" .