@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_stadium_	skos:broader	isac:engineering_structure_ .
isac:_bridge_	skos:broader	isac:engineering_structure_ .
isac:_building_	skos:broader	isac:engineering_structure_ .
isac:_jetty_	skos:broader	isac:engineering_structure_ .
isac:_levee_	skos:broader	isac:engineering_structure_ .