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This file contains all knowledge, thus:
Moreover it , a knowledge base can contain "static" or generic data. With static data we mean data that is constant and can be seen as knowledge (information, data with a meaning).
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Quaestor + Knowledge base = knowledge based system. : A combination used by Knowledge Engineers.
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Quaestor + Knowledge base + Project = (knowledge based) application. : A combination used by End-Users or Domain Experts.