@prefix rdf:	<http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix schema:	<http://schema.org/> .
@prefix rdfs:	<http://www.w3.org/2000/01/rdf-schema#> .
schema:Duration	rdf:type	rdfs:Class ;
	rdfs:subClassOf	schema:Quantity ;
	rdfs:label	"Duration" ;
	rdfs:comment	"Quantity: Duration (use  <a href='http://en.wikipedia.org/wiki/ISO_8601'>ISO 8601 duration format</a>)." .