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- The Datalog package contains a lightweight deductive database system.
- Queries and database updates are expressed using Datalog -- a
- declarative logic language in which each formula is a function-free
- Horn clause, and every variable in the head of a clause must appear
- in the body of the clause. The use of Datalog syntax and an
- implementation based on tabling intermediate results, ensures that
- all queries terminate.
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