<http://schema.org/free>	<http://www.w3.org/2000/01/rdf-schema#label>	"free" .
<http://schema.org/free>	<http://www.w3.org/2000/01/rdf-schema#comment>	"A flag to signal that the publication is accessible for free." .
<http://schema.org/free>	<http://www.w3.org/2000/01/rdf-schema#range>	<http://www.w3.org/2001/XMLSchema#boolean> .
<http://schema.org/free>	<http://www.w3.org/2000/01/rdf-schema#domain>	<http://schema.org/PublicationEvent> .
<http://schema.org/free>	<http://schema.org/supersededBy>	<http://schema.org/isAccessibleForFree> .
<http://schema.org/free>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#DatatypeProperty> .