_:vb50935852	<http://www.w3.org/ns/r2rml#constant>	<http://demo.openlinksw.com/schemas/School/startdate> .
_:vb50935854	<http://www.w3.org/ns/r2rml#column>	"StartDate" .
_:vb50935853	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb50935852 .
_:vb50935853	<http://www.w3.org/ns/r2rml#objectMap>	_:vb50935854 .