_:vb39605	<http://www.w3.org/ns/r2rml#objectMap>	_:vb39607 .
_:vb39606	<http://www.w3.org/ns/r2rml#constant>	<http://purl.org/dc/terms/created> .
_:vb39605	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb39606 .
_:vb39607	<http://www.w3.org/ns/r2rml#column>	"erf_datum" .