@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
<http://webisa.webdatacommons.org/concept/programmable+logic_controller_>	skos:broader	isac:controller_system_ .
isac:_controller_	skos:broader	isac:controller_system_ .