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+ +

Grammatical Framework

+Version 3.0 +

+June 2008 +

+ +

News

+27 June 2008: release of GF 3.0 and a new web page; the old web page is +here. +

+ +

What is GF

+GF, Grammatical Framework, is a programming language for +multilingual grammar applications. It is +

a special-purpose language for grammars, like YACC, Bison, Happy, BNFC +
a functional language, like Haskell, Lisp, OCaml, Scheme, SML +
a natural language processing framework, like LKB, XLE, Regulus +
a categorial grammar formalism, like ACG, CCG +
a logical framework, like Agda, Coq, Isabelle +

+ +

+Don't worry if you don't know most of the references above - but if you do know at +least one, it may help you to get a first idea of what GF is. +

Applications

+GF can be used for building +

[text translators ] +
[speech translators ] +
[natural-language interfaces ] +
[multilingual web pages ] +
[multilingual authoring systems ] +
[dialogue systems ] +
[language training systems ] +
[natural language resources ] +

+ +

Availability

+GF is open-source, licensed under [GPL ] (the program) and [LGPL ] (the libraries). It +is available for +

[Linux ] +
[Mac OS X ] +
[Windows ] +
via compilation to [JavaScript ], almost any platform that has a web browser +

+ +

Projects

+GF was born in 1998 at Xerox Research Centre Europe, Grenoble in the project +Multilingual Document Authoring. At Xerox, it was used for prototypes including +

restaurant phrase book in 6 languages +
database queries in 7 languages +
alarm system instructions in 5 languages +
medical drug descriptions in 2 languages +

+ +

+Later projects using GF and involving third parties include, in chronological order, +

GF-Alfa: natural language interface to formal proofs +
GF-KeY: authoring and translation of software specifications +
TALK: multilingual and multimodal spoken dialogue systems +
WebALT: multilingual generation of mathematical exercises (commercial project) +
MultiWiki: multilingual Wiki for restaurant reviews +
SALDO: Swedish morphological dictionary based on tools developed for GF +

+ +

+Academically, GF has been used in four [PhD theses ], and resulted in around +fifty [scientific publications ]. +

Programming in GF

+GF is easy to learn by following the tutorial. You can write your +first translator in 15 minutes. +

+GF has an interactive command interpreter, as well as a batch compiler. Grammars can be +compiled to parser and translator code in many different formats. These components can +then be embedded in applications written in other programming languages. The formats +currently supported are: +

Haskell +
Java +
JavaScript +
Prolog +
Speech recognition: HTK/ATK, Nuance, JSGF +

+ +

+The GF programming language is high-level and advanced, featuring +

static type checking +
higher-order functions +
dependent types +
pattern matching with data constructors and regular expressions +
module system with multiple inheritance and parametrized modules +

+ +

Libraries

+Libraries are at the heart of modern software engineering. In natural language +applications, libraries are a way to cope with thousands of details involved in +syntax, lexicon, and inflection. The GF resource grammar library has +support for an increasing number of languages, currently including +

Arabic (partial) +
Bulgarian +
Catalan (partial) +
Danish +
English +
Finnish +
French +
German +
Hindi/Urdu (partial) +
Interlingua +
Italian +
Norwegian bokmål +
Russian +
Spanish +
Swedish +

+ +

+Adding a language to the resource library takes 3 to 9 +months - contributions +are welcome! +

+ + + + -- cgit v1.2.3