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doc_words.pl -- Reason about Prolog jargon
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This module is shared between PlDoc and apropos/1 and collects information about the Prolog jargon to enhance recall and precision of the search. One could call it an ontology, but I guess that is a bit too much honour.

Source doc_related_word(+Term, -Related, -Distance) is nondet
True when Related is a word that is related to Term. Map some commonly known concepts to their Prolog related term. Where do we find a comprehensive list of these?
Source prolog_identifier_part(?Part) is nondet
True if Part appears as part of a Prolog identifier from the documentation. This extracts most of the Prolog jargon.