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From: mcovingt@athena.cs.uga.edu (Michael A. Covington)
Newsgroups: comp.lang.prolog
Subject: Tree drawing
Message-ID: <1991Feb16.035944.3055@athena.cs.uga.edu>
Date: 16 Feb 91 03:59:44 GMT
Organization: University of Georgia, Athens
Lines: 20

Has anyone written a routine to display a Prolog structure in
tree form, so that for example

	s(np(d(the),n(dog)),vp(v(barked)))

prints as something like this: --?

	   s
           |
      ----------
      np       vp
      |        |
    ------     |
    |    |     |
    d    n     v

   the  dog  barked

This is obviously useful for displaying the output of a parser, but
it also has other uses.