LDML47-Stable

LDML47 is the first stable release of the MessageFormat specification.

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Changes in this release (from 46.1) include:

• Made MessageFormat stable and made the stability policy normative.
• Added or clarified terminology:
  • Linked all terminology in the MessageFormat section to the term's definition.
  • Defined option value, literal key, string value, and digit size option formally. Other definitions were defined or modified for clarity.
  • Replaced the concept of a "function registry" with default functions and u: namespace functions and options.
  • Changed the data model to be called the "Interchange Data Model"
• Modified portions of the syntax (ABNF)
  • Removed number-literal from the ABNF and moved its definition to the default functions for numeric formatting.
  • Changed (expanded) the range of characters allowed in an unquoted literal and simplified syntax character set definitions.
• Revised the Default Bidi Strategy.
• Enabled functions to know whether an option value was set using a literal or a variable, which is necessary for some function's selection mechanism (see below).
• Updated the default functions:
  • Only three default functions are stable: :string, :number, and :integer. Other functions are Draft.
  • Some options have been removed, modified, or made optional.
  • The select option on :number and :integer functions now accepts only literal values.
  • Removed the style percent from :number and :integer pending future standardization.
  • The u: namespace options u:id and u:dir are optional; u:locale is Draft.
• Clarified how to include the character "*" in a key.