Are separate language codes defined for dialects of languages?
A dialect of a language is usually represented by the same language code as that used for the language. If the language is assigned to a collective language code, the dialect is assigned to the same collective language code. Generally, dialects are not given different codes, but determining the difference between dialects and languages will be decided on a case-by-case basis. In the future ISO 639-6, currently under development, may be used to identify language variants and dialects.