PLOGHELP GRAMMARS                           Kathryn Seifert  August 1986

Overview of HELP files dealing with grammars and natural language

Keywords: overview, grammar, natural language, symbols, syntax, parsing


A grammar for a language is a set of rules which specifies what
sequences of words are acceptable as sentences in that language.  The
grammar specifies how words can be grouped together into phrases and
what ordering of phrases can be used to form sentences.  Prolog has a
special notation for expressing grammar rules.  This special notation
was designed to aid people in writing "parsers".  A parser is a computer
program which determines the structure (constructs a "parse tree") for
sentences in a language.

The following HELP files discuss this special notation for grammar
rules, along with other Prolog facilities for developing grammars and
library programs dealing with natural language.


PLOGHELP * EXPAND_TERM
 Predicate to translate grammar rules into normal Prolog clauses

PLOGHELP * GRAMMAR_RULE
 Prolog facilities for expressing definite clause grammars

PLOGHELP * LERNGRAM
 Library program for learning concepts about English sentences

PLOGHELP * PARSEDEMO
 Library demonstration program of a simple natural language parser

PLOGHELP * PHRASE
 Predicate for invoking goals involving grammar rules

TEACH * GRAMMAR_RULES
 Tutorial introduction to Prolog grammar rules


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