@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_postgresql_	skos:broader	<http://webisa.webdatacommons.org/concept/_knowledge_of+database> .
isac:_mysql_	skos:broader	<http://webisa.webdatacommons.org/concept/_knowledge_of+database> .
isac:_oracle_	skos:broader	<http://webisa.webdatacommons.org/concept/_knowledge_of+database> .