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+
+The files in the symbols directory describe possible layouts for a given
+keyboard.
+
+The default layout in each file should describe the most common layout
+for its kind, usually the symbols printed on the keys. Layout variants
+can describe common differences that are not necessarily printed on the keys.
+(e.g. a phonetic version of Cyrillic).
+
+The names of the files are referenced throughout the XKB rules, and may be
+exposed in the X server configuration and in user configuration tools.
+The filenames use the following convention:
+
+Country layouts:
+
+ Keyboard layouts for a country must use the 2-letter code from the
+ ISO-3166 standard.
+
+Language layouts:
+
+ Keyboard layouts for a language must use the 3-letter code from the
+ ISO-639 standard.
+
+Script layouts:
+
+ Keyboard layouts for a script must use the 4-letter code from the
+ ISO-15924 standard.
+
+Other:
+
+ Keyboard layouts that do not fit in the above model and directories
+ must use a filename between 5 and 8 characters.
+
+The ISO codes can be found at the following addressed:
+
+Country layouts: http://www.iso.org/iso/en/prods-services/iso3166ma/02iso-3166-code-lists/iso_3166-1_decoding_table.html
+Language layouts: http://www.loc.gov/standards/iso639-2/langcodes.html
+Script layouts: http://www.unicode.org/iso15924/iso15924-codes.html
+
+The description in the directory file base.xml.in should match the group names
+in the symbols file.
+
+If the layout is country-based, this has to be the full
+name of the country. It is highly not recommended to use the forms
+"Republic of XXX" or "XXX Republic" - the form "XXX" should be used instead.
+The only exception is "United Kingdom".
+
+If the layout is language-based, this has to be the name of the language.
+
+Within single symbols file, all the variants should have the same group name
+(implemented using the "include" directive wherever possible).