_:vb50711994	<http://www.w3.org/ns/r2rml#column>	"erf_datum" .
_:vb50711992	<http://www.w3.org/ns/r2rml#objectMap>	_:vb50711994 .
_:vb50711993	<http://www.w3.org/ns/r2rml#constant>	<http://purl.org/dc/terms/created> .
_:vb50711992	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb50711993 .