_:vb50791022	<http://www.w3.org/2007/05/powder-s#describedby>	<http://demo.openlinksw.com/about/id/entity/urn/r2rml:qa:nfl:1> .
_:vb50791021	<http://www.w3.org/2007/05/powder-s#describedby>	<http://demo.openlinksw.com/about/id/entity/urn/r2rml:qa:nfl:1> .
_:vb50791021	<http://www.w3.org/ns/r2rml#objectMap>	_:vb50791023 .
_:vb50791023	<http://www.w3.org/ns/r2rml#column>	"IsSack" .
_:vb50791022	<http://www.w3.org/ns/r2rml#constant>	<http://demo.openlinksw.com/schemas/nfl/issack> .
_:vb50791023	<http://www.w3.org/ns/r2rml#datatype>	<http://www.w3.org/2001/XMLSchema#boolean> .
_:vb50791021	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb50791022 .
_:vb50791023	<http://www.w3.org/2007/05/powder-s#describedby>	<http://demo.openlinksw.com/about/id/entity/urn/r2rml:qa:nfl:1> .