_:vb135161	<http://www.w3.org/ns/r2rml#column>	"PMID" .
_:vb135160	<http://www.w3.org/ns/r2rml#objectMap>	_:vb135161 .
_:vb135160	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb135159 .
_:vb135159	<http://www.w3.org/ns/r2rml#constant>	<http://demo.openlinksw.com/schemas/semmed/pmid> .