The following guideline is used for specifying the language model filename. [_][.]. is lowercase and taken from ISO 639-1. If ISO 639-1 does not define a two-letter language code, a three-letter code defined by ISO 639-2 is used. The field is optional, uppercase, and taken from ISO 3166-1. If ISO 3166-1 does not define a two-letter country code, use two or three lowercase letters and if possible, use the top-level domain for the country. The field is only optional if there is only one codeset present for a language. It should be specified using a lowercase representation of the preferred MIME name for that codeset. The is "lm" to specify the original language model format and "ln" to specify the new language model format. -- The original language models in "lm" format are part of the TextCat program located at http://odur.let.rug.nl/~vannoord/TextCat/ and were originally authored by Gertjan van Noord . tr.iso-8859-9.ln and ja.iso-2022-jp.ln were collated by Daniel Quinlan.