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[Bug 14360] Count Unicode 'combining marks" together with "inter-element whitespace"

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Date: Mon, 03 Oct 2011 12:08:03 +0000
To: public-html-bugzilla@w3.org
Message-Id: <E1RAhJT-0006Be-MA@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=14360

David Carlisle <davidc@nag.co.uk> changed:

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--- Comment #1 from David Carlisle <davidc@nag.co.uk> 2011-10-03 12:08:01 UTC ---
note 

 2)  Also, in a parenthesis or side note, state that if an isolated 
       combining mark is needed, then a one should, in line with
       Unicode 6.0, combine it  with U+00A0 no-break space.

this would make any use of the entities 

DownBreve tdot TripleDot DotDot

Non conforming, see

http://www.w3.org/TR/2010/REC-xml-entity-names-20100401/#chars_math-multiple-tables

prefixing with #160 rather than #32 wasn't really an option due to legacy use
of <mo>& tdot;</mo>
to get a triple dot accent.
space characters are ignored in mathml processing so changing the definition of
tdot from U+20DB to U+0020 U+20DB (at MathML 2 if I recall correctly) wouldn't
affect processing but did meet the requirement not to start an entity with a
combining character. Using U+00A0 instead would have affected the spacing if
this were used alone and made this character most likely not recognised if used
in accent constructs.

> Prior to Version 4.1 of
the Unicode Standard, the standard also recommended the use of U+0020 space for
display of isolated combining marks. This is no longer recommended,

Unicode may have changed its recommendation here but these entities had been
standardised years earlier.

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Received on Monday, 3 October 2011 12:08:08 UTC

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