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NLUSNTAX.PL
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1991-10-31
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/* From the book PROLOG PROGRAMMING IN DEPTH
by Michael A. Covington, Donald Nute, and Andre Vellino.
Copyright 1988 Scott, Foresman & Co.
Non-commercial distribution of this file is permitted. */
/* NLUSNTAX.PL */
/* Syntax for the language that will be parsed
by NLU.PL (See NLU.PL for vocabulary.) */
/* Rule */ /* Example */
sentence -->
noun_phrase, verb_phrase. /* Dogs chase cats. */
sentence -->
noun_phrase, copula, noun_phrase. /* Dogs are animals. */
sentence -->
noun_phrase, copula, adj_phrase. /* Dogs are big. */
sentence -->
aux_verb, noun_phrase, verb_phrase. /* Do dogs chase cats? */
sentence -->
copula, noun_phrase, noun_phrase. /* Are dogs animals? */
sentence -->
copula, noun_phrase, adj_phrase. /* Are dogs big? */
verb_phrase --> verb, noun_phrase. /* chase cats */
adj_phrase --> adjective. /* big */
noun_phrase -->
determiner, noun_group. /* a big brown dog */
noun_group --> adjective, noun_group. /* big brown dog */
noun_group --> common_noun. /* dog */
noun_group --> proper_noun. /* Fido */