_:vb40011	<http://www.w3.org/ns/r2rml#column>	"DOI" .
_:vb40010	<http://www.w3.org/ns/r2rml#constant>	<http://purl.org/ontology/bibo/doi> .
_:vb40009	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb40010 .
_:vb40009	<http://www.w3.org/ns/r2rml#objectMap>	_:vb40011 .