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From: ted@nmsu.edu (Ted Dunning)
Newsgroups: comp.lang.prolog
Subject: odd question
Message-ID: <TED.91Feb20172451@kythera.nmsu.edu>
Date: 21 Feb 91 00:24:51 GMT
Sender: news@NMSU.Edu
Distribution: comp
Organization: Computing Research Lab
Lines: 9


a friend was reading an article the other day and she ran into the
following

   {S:verb:head :: Vp:head}

on the right hand side of a DCG rule.

the question is, what does the :: do?