CLDR 21.0.2: New T Extensions for language/locale identifiers

New T Extension fields and subfields [RFC 6497] are now available for use in BCP47 and Unicode Locale/Language Identifiers. These T extensions provide for the identification of transforms that can be used for tagging content or requesting resources. The new T extension fields and subfields are defined in the following files, as part of the CLDR 21.0.2 release:

• i0 - Input Method Transformations: bcp47/transform_ime.xml
• k0 - Keyboard Transformations: bcp47/transform_keyboard.xml
• t0 - Machine Translations: bcp47/transform_mt.xml
• x0 - Private Use fields: bcp47/transform_private_use.xml

For example:

• "zh-t-i0-pinyin", to indicate Chinese text generated with a pinyin input method
• "en-t-k0-dvorak", to identify a Dvorak keyboard for English
• "it-t-k0-osx-extended", to request an extended Mac keyboard for Italian

The private use subfields can be used for private agreements, such as:

• "ru-t-en-x0-mobile", to indicate a translation from English to Russian for use on a mobile device, or
• "ja-t-de-t0-und-x0-medical", to identify a machine translation from German to Japanese with a specialized dictionary for medical terms.

Related to this, there is draft keyboard layout data currently slated for CLDR 22.0: see Draft Keyboard Charts.