Discussion
Why is a knowledge base different from a database?
Answer: A
A database returns what was put in, while a knowledge base returns what follows, so a query may be answered by a chain of inference over facts none of which mentions the query directly. Format, query language and size are engineering differences of degree. That the answer to a question may be present only implicitly, and must be computed, is the whole point of the machinery and the reason its cost is worth paying.
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