Proposed Draft UTR #53, Unicode Arabic Mark Ordering Algorithm Now Available for Public Review

The Unicode Consortium has released Proposed Draft Unicode Technical
Report #53, Unicode Arabic Mark Ordering Algorithm
<http://www.unicode.org/reports/tr53/>. This UTR describes an algorithm
for determining correct rendering of Arabic combining mark sequences.

The combining classes of Arabic combining characters in Unicode are a
mixture of special classes for specific marks plus two more generalized
classes for all the other marks. For many years this has resulted in
inconsistent rendering for sequences with multiple combining marks such as:

[ Arabic Image ]

The algorithm described in this UTR provides a method to reorder Arabic
combining marks in order to accomplish the following goals:

    * The inside-out rendering rule will display combining marks in the
      expected visual order.
    * Ensure identical display of canonically equivalent sequences.
    * Provide a mechanism for overriding the display order in
      exceptional cases.

The document is in “Proposed Draft” state, and made available for public
review and comment <http://www.unicode.org/review/pri359/>. Information
about this type of document can be found on the About Unicode Technical
Reports <http://www.unicode.org/reports/about-reports.html> page.

For information about how to discuss this Public Review Issue and how to
supply formal feedback, please see the PRI #359 page
<http://www.unicode.org/review/pri359/>.

http://blog.unicode.org/2017/09/proposed-draft-utr-53-unicode-arabic.html

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