_:vb39441	<http://www.w3.org/ns/r2rml#objectMap>	_:vb39443 .
_:vb39442	<http://www.w3.org/ns/r2rml#constant>	<http://purl.org/dc/terms/created> .
_:vb39441	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb39442 .
_:vb39443	<http://www.w3.org/ns/r2rml#column>	"erf_datum" .