_:vb39928	<http://www.w3.org/ns/r2rml#constant>	<http://purl.org/ontology/bibo/doi> .
_:vb39927	<http://www.w3.org/ns/r2rml#objectMap>	_:vb39929 .
_:vb39929	<http://www.w3.org/ns/r2rml#column>	"DOI" .
_:vb39927	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb39928 .