@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_maintenance_	skos:broader	isac:engineering_function_ .
isac:_design_	skos:broader	isac:engineering_function_ .
isac:_construction_	skos:broader	isac:engineering_function_ .