@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_image_	skos:broader	isac:reasonable_representation_ .
isac:_photograph_	skos:broader	isac:reasonable_representation_ .
isac:_videotape_	skos:broader	isac:reasonable_representation_ .