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