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For other uses of "Mule", see Mule (disambiguation).

MULE is the MULtilingual Enhancement to GNU Emacs.

MULE provides facilities not only for handling text written in many different languages (at least 42 character sets, 53 coding sets, 128 input methods, and 58 languages[1]), but in fact multilingual texts containing several languages in the same buffer. This goes beyond the simple facilities offered by Unicode for representation of multilingual text. MULE also supports input methods, composing display using fonts in various encodings, changing character syntax and other editing facilities to correspond to local language usage, and more.

MULE was originally based on Nemacs, a version of Emacs extended to handle Japanese, released in 1987. Development stalled, and the effort to incorporate increased language functionality into the main Emacs version stalled, until the fork between Lucid Inc. and the FSF led to XEmacs, which for several years boasted considerably better support for multiple languages and character sets. This competition reinvigorated development of GNU Emacs's language handling capabilities and prompted the inclusion of MULE in version 21 of GNU Emacs.

MULE was written by the researchers Satoru Tomura, Ken'ichi Handa, Mikiko Nishikimi, and Naoto Takahashi, of the AIST, which is a part of METI, of the government of Japan.[1] This made it impossible for the developers to assign copyright to FSF, as is usually done for contributions to GNU packages.[2]


  1. ^ a b "Open Source Software Research Activities in AIST towards Secure Open Systems", by Kazuhito Ohmaki, in Proceedings of the 7th IEEE International Symposium on High Assurance Systems Engineering (HASE'02), pg 37-, 2002 ISBN 0-7695-1769-2. IEEE Computer Society Washington, DC, USA
  2. ^ Re: VM and the FSF

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