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Naf denotes negation as failure in one of its incarnations
(well-founded or stable-model). The actual flavor of Naf is determined
by inspecting the value of a semantic tag associated with the ruleset.
Naf is used in LP (and in queries and constraints over the intended
models of LP); it can possibly be relevant to PR and RR.
Its XML serialization form is:
<Naf>
(XML serialization of Atom)
</Naf>
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