@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_ldap_	skos:broader	isac:authentication_server_ .
isac:active_directory_	skos:broader	isac:authentication_server_ .
isac:_radius_	skos:broader	isac:authentication_server_ .
isac:_kerbero_	skos:broader	isac:authentication_server_ .