Proposed Unicode Technical Standard #35

Unicode Locale Data Markup Language (LDML)
Appendix A: Modifications

For the full header, table of contents, and status, see Part 1: Core.

Summary

This is a partial document, describing only the changes to the LDML since the previous release. For the other parts of the LDML see the main LDML document.

Contents of Appendix A, Modifications

• Modifications
  • Changes in LDML Version 49 (Differences from Version 48.0)
  • Locales
    • Date and Time
    • MessageFormat
  • Numbers
  • Units
  • Keyboard
  • Segmentation

Modifications

Changes in LDML Version 49 (Differences from Version 48.0)

Locales

• typeValues Added typeValues for On/Off translations in menus and locale display names

• Key/Type Descriptions In the Key/Type Description table, added a description of which keys/types use constructed values, and a brief description of the typeValue element.
  • These elements are not present in root.xml. When not present in a top-level locale, they fall back to the key or value identifier.
  • Also changed the table from HTML into Markdown, with each Key description (such as co for collation) having its own level-five section heading.
• Boundary Spacing Added new description of placeholderBoundarySpacing.
• (48.2) New section Nested Bracket Replacement.
• (48.2) Locale Display Name Algorithm updated to use the nested bracket replacement data and avoid nested parentheses by flattening -t- (transform) language names.
  • As part of this, the display name order is changed so that any names for -u- items appear before (instead of after) any names for -t- items.
• (48.2) Specified that missing <keys> translations should fall back to the key identifier.
• (48.2) The section "Enhanced Language Matching" was retitled to Language Matching Variables and clarified.

Date and Time

• Calendar era codes Added length limit and clarified format.

• Date Field Symbols & Skeletons Document that pattern-only symbols (L, q, c), non-canonical hour symbols (K, k), and invalid day period combinations are discouraged in skeletons and planned for deprecation in CLDR 50.

• Missing Skeleton Fields Added Date-Timezone pattern for gluing date and time zone fields together, evaluated before Time-Day-Of-Week, and clarified placeholder assignments and usage in appendItems.

• interval formats Described the new interval range separator patterns and how they are used to produce fallback patterns.
• Numeric date/time separators Added separators for times and numeric dates in technical preview to allow easier customization.

• Ordinal days, ddd symbol Added documentation of dayOfMonth elements and the related ddd symbol in technical preview.

• Hour Cycle Pattern Variations Specified how semantic skeleton hour cycle options (Clock12, Clock24, H11, H12, H23, H24) adjust the matched pattern after standard skeleton matching.

• Time Zone Names Removed gmtZeroOffset item.
• Time_Zone_Format_Terminology Clarified that not all timezones have location (or location format).
• Time_Zone_Goals Modified the location format construction.
• Time Zone Format Terminology Clarified the computation of the exemplar city for non-location zones.

MessageFormat

• :currency, :percent The :currency and :percent functions are now Stable, with the same implementations as previously.
• The u:locale option (previously in Draft) has been dropped from the specification.

Numbers

• Currencies Revised the numberFormat description for currencies.

• Plural rules syntax Made it clear that plural rules are evaluated in semantic order (zero, then one,…).

Units

• Unit Preferences Data Made formatting and phrasing more internally consistent

Keyboard

• References and links into the section concerning keyboard test data (which was removed prior to spec finalization) were removed.
• Default Backspace Transform Normalization for the default backspace transform was clarified, and authors were encouraged to add backspace transforms to avoid the default.

Segmentation

• (48.1) Segmentations removed outdated note about X Format*->X.

Note that small changes such as typos and link fixes are not listed above. Modifications in previous versions are listed in those respective versions. Click on Previous Version in the header until you get to the desired version.

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