@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:rfid_antenna_	skos:broader	isac:security_sensor_ .
isac:_door_	skos:broader	isac:security_sensor_ .
isac:motion_detector_	skos:broader	isac:security_sensor_ .