TY - BOOK

T1 - Context-Free Grammars: Covers, Normal Forms, and Parsing

A2 - Nijholt, Anton

PY - 1980

Y1 - 1980

N2 - This monograph develops a theory of grammatical covers, normal forms and parsing. Covers, formally defined in 1969, describe a relation between the sets of parses of two context-free grammars. If this relation exists then in a formal model of parsing it is possible to have, except for the output, for both grammars the same parser. Questions concerning the possibility to cover a certain grammar with grammars that conform to some requirements on the productions or the derivations will be raised and answered. Answers to these cover problems will be obtained by introducing algorithms that describe a transformation of an input grammar into an output grammar which satisfies the requirements. The main emphasis in this monograph is on transformations of context-free grammars to context-free grammars in some normal form. However, not only transformations of this kind will be discussed, but also transformations which yield grammars which have useful parsing properties.

AB - This monograph develops a theory of grammatical covers, normal forms and parsing. Covers, formally defined in 1969, describe a relation between the sets of parses of two context-free grammars. If this relation exists then in a formal model of parsing it is possible to have, except for the output, for both grammars the same parser. Questions concerning the possibility to cover a certain grammar with grammars that conform to some requirements on the productions or the derivations will be raised and answered. Answers to these cover problems will be obtained by introducing algorithms that describe a transformation of an input grammar into an output grammar which satisfies the requirements. The main emphasis in this monograph is on transformations of context-free grammars to context-free grammars in some normal form. However, not only transformations of this kind will be discussed, but also transformations which yield grammars which have useful parsing properties.

KW - IR-66928

KW - HMI-SLT: Speech and Language Technology

KW - EWI-9219

U2 - 10.1007/3-540-10245-0

DO - 10.1007/3-540-10245-0

M3 - Book

SN - 0-387-10245-0

T3 - Lecture Notes in Computer Science

BT - Context-Free Grammars: Covers, Normal Forms, and Parsing

PB - Springer

CY - Berlin

ER -