@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:physical_layer_	skos:broader	isac:software_layer_ .
isac:_driver_	skos:broader	isac:software_layer_ .
isac:_system_	skos:broader	isac:software_layer_ .
isac:operating_system_	skos:broader	isac:software_layer_ .
isac:_library_	skos:broader	isac:software_layer_ .
isac:_vmware_	skos:broader	isac:software_layer_ .
isac:device_driver_	skos:broader	isac:software_layer_ .
isac:file_system_	skos:broader	isac:software_layer_ .