@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_virtualbox_	skos:broader	isac:virtualisation_software_ .
isac:_vmware_	skos:broader	isac:virtualisation_software_ .
isac:_kvm_	skos:broader	isac:virtualisation_software_ .