L2/00-154

Subject: Suggested clarification for TR#9


Date: Wed, 26 Apr 2000 12:42:01 -0700
From: Asmus Freytag <asmusf@ix.netcom.com>

UTC discussed some issues related to mirroring. The current state of
the discussion is to add some clarifying language to Sections 3.12 and
4.7. The language below will be reviewed by UTC for logical content, and,
if accepted, remanded to the editorial committee for further editing for
style and readability.

1) Under Higher Level Protocols insert one bullet:

o /Suppress the mirroring for selected characters, based on language 
information/. In some languages, some of the characters that have the 
mirrored property are not customarily rendered with mirrored glyphs. For 
example, this applies to mathematical operators in Hebrew. In these 
situations a higher level protocol may exempt some characters from rule 
L4. However, where mirroring is used, it must be done by application of 
rule L4, to ensure that the correct (un-mirrored) character code is used 
to express the intended semantic of the character. See Section 4.7, 
Mirrored--Normative.

2) After the end of the first paragraph in section 4.7 add:

The mirrored property is important to ensure that the correct character 
codes are used for the desired semantic. This is of particular importance 
where the name of a character does not indicate the intended semantic, 
e.g. LEFT PARENTHESIS.

Note that some languages do not require that all characters that have 
the mirrored property are always rendered with mirrored glyphs. Where 
language information is available to a higher level protocol, mirroring 
can be limited
to those characters that do get mirrored in that language. See 
Higher-Level Protocols in Section 3.12 Bidirectional Behavior.

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