@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_geography_	skos:broader	isac:optional_subject_ .
isac:_english_	skos:broader	isac:optional_subject_ .
isac:_history_	skos:broader	isac:optional_subject_ .
isac:_french_	skos:broader	isac:optional_subject_ .
isac:religious_study_	skos:broader	isac:optional_subject_ .
isac:secondary_level_	skos:broader	isac:optional_subject_ .