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Unicode Locales Stability Policy

Unicode CLDR Repository Stability

Each release of the Unicode CLDR is a stable release and may be used as reference material or cited as a normative reference by other specifications. Each version, once published, is absolutely stable and will never change. Implementations may also apply CLDR Corrigenda to a release.

Unicode LDML Specification Stability

The UTS #35: Locale Data Markup Language (LDML) may be changed to add structure for new kinds of data or other features. Structural changes are always backwards-compatible. That is, previous files will continue to work. Deprecated elements remain and can be used, although their usage is strongly discouraged.

Structural changes that require non-trivial code for proper implementation, such as time zone fallback or alias mechanisms require the existence of at least a prototype implementation that demonstrates correct function according to the proposed specification.