<http://webisa.webdatacommons.org/concept/pdf+file_format_>	<http://www.w3.org/2000/01/rdf-schema#label>	"pdf file format" .
<http://webisa.webdatacommons.org/concept/pdf+file_format_>	<http://webisa.webdatacommons.org/ontology#hasPreModifier>	"pdf file" .
<http://webisa.webdatacommons.org/concept/pdf+file_format_>	<http://webisa.webdatacommons.org/ontology#hasHead>	"format" .