@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_or_	skos:broader	isac:boolean_operator_ .
isac:_and_	skos:broader	isac:boolean_operator_ .
isac:_operator_	skos:broader	isac:boolean_operator_ .
isac:_not_	skos:broader	isac:boolean_operator_ .
isac:_word_	skos:broader	isac:boolean_operator_ .
isac:_parenthesis_	skos:broader	isac:boolean_operator_ .
isac:_precedence_	skos:broader	isac:boolean_operator_ .
isac:not_operator_	skos:broader	isac:boolean_operator_ .