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| ontology | + class expressions, etc. | KIF, DAML+OIL |
| data model | + abstraction | UML |
| database schema | + relations between objects | RDBMS, OODBMS |
| class hierarchy | + attributes | C++, Java, CORBA IDL |
| taxonomy | subclass relationships | biology |
| directory | grouping of related items | yahoo.com |
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