@prefix rdfs:	<http://www.w3.org/2000/01/rdf-schema#> .
@prefix c:	<http://www.w3.org/2002/12/cal/icaltzd#> .
@prefix virtrdf:	<http://www.openlinksw.com/schemas/virtrdf#> .
c:summary	rdfs:subPropertyOf	virtrdf:label .