@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_string_	skos:broader	isac:immutable_class_ .
isac:_integer_	skos:broader	isac:immutable_class_ .
isac:string_class_	skos:broader	isac:immutable_class_ .
isac:_nsstring_	skos:broader	isac:immutable_class_ .