_:vb50790397	<http://www.w3.org/ns/r2rml#column>	"IsSack" .
_:vb50790397	<http://www.w3.org/ns/r2rml#datatype>	<http://www.w3.org/2001/XMLSchema#boolean> .
_:vb50790395	<http://www.w3.org/ns/r2rml#constant>	<http://demo.openlinksw.com/schemas/nfl/issack> .
_:vb50790396	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb50790395 .
_:vb50790396	<http://www.w3.org/ns/r2rml#objectMap>	_:vb50790397 .