@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_database_	skos:broader	isac:persistent_memory_ .
isac:_disk_	skos:broader	isac:persistent_memory_ .
isac:_memory_	skos:broader	isac:persistent_memory_ .
<http://webisa.webdatacommons.org/concept/hard+disk_drive_>	skos:broader	isac:persistent_memory_ .
isac:magnetic_disk_	skos:broader	isac:persistent_memory_ .
isac:disk_file_	skos:broader	isac:persistent_memory_ .