_:vb50790398	<http://www.w3.org/ns/r2rml#constant>	<http://demo.openlinksw.com/schemas/nfl/ischallenge> .
_:vb50790400	<http://www.w3.org/ns/r2rml#datatype>	<http://www.w3.org/2001/XMLSchema#boolean> .
_:vb50790399	<http://www.w3.org/ns/r2rml#objectMap>	_:vb50790400 .
_:vb50790399	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb50790398 .
_:vb50790400	<http://www.w3.org/ns/r2rml#column>	"IsChallenge" .