#14143This paper gives an overall account of a prototype natural language question answering system, called Chat-80. Chat-80 has been designed to be both efficient and easily adaptable to a variety of applications.
tech,1-3-J82-3002,ak
to a variety of applications . The
<term>
system
</term>
is implemented entirely in
<term>
#14161The system is implemented entirely in Prolog, a programming language based on logic.
other,13-3-J82-3002,ak
programming language
</term>
based on
<term>
logic
</term>
. With the aid of a
<term>
logic-based
#14173The system is implemented entirely in Prolog, a programming language based on logic .
tool,12-4-J82-3002,ak
<term>
extraposition grammars
</term>
,
<term>
Chat-80
</term>
translates English questions into
#14187With the aid of a logic-based grammar formalism called extraposition grammars, Chat-80 translates English questions into the Prolog subset of logic.