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. 2007 Aug 9;20(Suppl 1):34–46. doi: 10.1007/s10278-007-9065-0

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Fig 3 — Protégé architecture. Protégé is built using a tiered architecture. The Protégé knowledge model is an object-oriented model (“OO Model”) of ontologies stored in a persistence layer (DB storage) and accessed via the Protégé API. The API is used both by the protégé GUI application (View layer) with which users access the ontologies, as well as by application programs (Application layer). New functionality is added to Protégé by creating plug-ins, which access ontologies through the Protégé API and with which the user can interact by plugging into the Protégé GUI.