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4.2.2 Definite clause grammar (DCG)

The ISO working group on the Prolog standard publishes a reference implementation of the part 3 draft which it should be possible to load as with any other Prolog file. Should you have difficulty finding it it is also in the git repository for GPJ. This should then provide support for part 3 of the standard. This currently does not work as it depends on some of the 2006 ISO extensions which we should have implemented for 0.3.0.