Grammatical Framework

A programming language for multilingual grammar applications

News

2014-06-23:GF 3.6 released! Release notes.
2014-03-11: A company for commercial applications of GF has been founded: Digital Grammars.
2013-11-25: The default character encoding in GF grammar files will be changed from Latin-1 to UTF-8. See GF character encoding changes for details.
2013-10-18:New resource grammar language: Estonian. See library synopsis.
2013-09-18:New GF contributions repository, hosted on GitHub.
2013-08-06:GF 3.5 released! Release notes.
2013-07-26:Started a page with RGL Documentation and Publications.
2013-06-24:We are now running the IRC channel #gf on the Freenode network.
2013-06-19:New resource grammar language: Maltese. See library synopsis.
2013-04-25:New resource grammar language: Greek. See library synopsis.
2013-01-31:GF 3.4 released! Release notes.
2012-12-10: Resource Grammar Library coverage map, created by Tommi Nieminen.

What is GF

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

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

Availability

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

Projects

GF was first created in 1998 at Xerox Research Centre Europe, Grenoble, in the project Multilingual Document Authoring. At Xerox, it was used for prototypes including a restaurant phrase book, a database query system, a formalization of an alarm system instructions with translations to 5 languages, and an authoring system for medical drug descriptions.

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

Here is a talk about GF at XRCE, 14 years later.

Academically, GF has been used in at least ten PhD theses and resulted in more than a hundred scientific publications (see GF publication list).

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:

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

Getting help

If you need some help with GF, the first places to start are the Tutorial and Reference pages. The printed book contains all the material in the tutorial and some extra bits, and is the recommended reference for GF.

We run the IRC channel #gf on the Freenode network, where you are welcome to look for help with small questions or just start a general discussion. IRC logs (in raw format) are available here. If you have a larger question which the community may benefit from, we recommend you ask it on the mailing list.

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

  1. Afrikaans
  2. Amharic (partial)
  3. Arabic (partial)
  4. Bulgarian
  5. Catalan
  6. Chinese
  7. Danish
  8. Dutch
  9. English
  10. Estonian
  11. Finnish
  12. French
  13. German
  14. Greek
  15. Hebrew (fragments)
  16. Hindi
  17. Interlingua
  18. Japanese
  19. Italian
  20. Latin (fragments)
  21. Latvian
  22. Maltese
  23. Nepali
  24. Norwegian bokmål
  25. Persian
  26. Polish
  27. Punjabi
  28. Romanian
  29. Russian
  30. Sindhi
  31. Spanish
  32. Swahili (fragments)
  33. Swedish
  34. Thai
  35. Turkish (fragments)
  36. Urdu

Adding a language to the resource library takes 3 to 9 months - contributions are welcome! You can start with the resource grammarian's tutorial.