Testing the Unicode Bidirectional Algorithm for Unicode 6.3

Unicode Standard Annex #9, Unicode Bidirectional Algorithm
<http://www.unicode.org/reports/tr9/tr9-28.html> (UBA), has a major
update slated for release in September, 2013. This update is the most
significant change in Unicode 6.3. The changes to the algorithm and text
have been already been approved by the Unicode Technical Committee,
subject to final editorial review.

The Unicode Technical Committee is encouraging implementations to test
their code against the new test files and the two reference
implementations during the month of July, 2013. It is vital that the
interpretation of the text of the specification in UAX #9 be absolutely
clear, and that the values in the test data be thoroughly tested by at
least two implementations before release, because any changes after
release---even to fix problems---can cause significant interoperability
problems. The UBA is used for displaying all Arabic and Hebrew text on
the web and in application programs, so there are significant
ramifications for any changes to the algorithm.

The proposed update to UAX #9 involves a substantial extension of the
UBA to allow for the implementation of isolate runs, introducing new
Bidi_Class property values and formatting characters in support of that
extension. There are also changes to /Section 3.3.5, Resolving Neutral
and Isolate Formatting Types/ to resolve paired punctuation marks as a
unit. For details, see http://www.unicode.org/reports/tr9/tr9-28.html.

http://unicode-inc.blogspot.com/2013/06/testing-unicode-bidirectional-algorithm.html

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