From: <jpederse@wiley.com>

Date: Thu, 31 Jul 2003 09:37:51 -0400

To: "'MathML list'" <www-math@w3.org>

Message-ID: <OF642B458F.3866F83A-ON85256D74.0049B2F0@wiley.com>

Date: Thu, 31 Jul 2003 09:37:51 -0400

To: "'MathML list'" <www-math@w3.org>

Message-ID: <OF642B458F.3866F83A-ON85256D74.0049B2F0@wiley.com>

Is the set of combining diacritical marks (Unicode blocks U+0300-036F and U+20D0-20FF) more appropriate for use as accents (even though most don't have symbolic names)? There they do have, for example, an under dot (U+0323) in addition to the over dot. In MathML I suppose it would still need the <munder> treatment though (outside of <mtext>). I have a related question: what is the correct way in MathML to tag "crossed out" parts of fractions, used to indicate terms that have been cancelled? If it is a single letter or number, then the combining solidus U+0338 would do the trick, but is there a way to indicate a line through a whole expression? Should I use <mrow>...the expression...</mrow><mo>̶</mo> ? Thank you. John Pedersen Content Systems, John Wiley & Sons, Inc. "Pepping, Simon (ELS)" To: "'MathML list'" <www-math@w3.org> <S.Pepping@elsevi cc: er.nl> Subject: Accented variables Sent by: www-math-request@ w3.org 07/25/03 08:00 AM In TeX there are specific accents for math: \tilde A etc. In MathML there does not seem to be such a thing. The msup, mover etc. constructs are much less specific and much more variable: for example, some people may use ∼, others may use ˜, for the tilde accent. They seem to encode the idea that one may use any character as a superior to or over another character. For the well-known math accents that is not appropriate; one would like to use specific accent characters. Is there a specific or recommended set of characters which are suitable for accents on math variables? The symbols in the entities file isodia.ent http://www.w3.org/TR/MathML2/isodia.html may be a good candidate set. But they are all spacing accents, which by themselves are already higher and smaller than a normal character. This situation seems to be identical to the prime, discussed on this list: http://lists.w3.org/Archives/Public/www-math/2002Nov/0024.html. As an extreme example, ˙ is dot above. Using it in an munder would not seem appropriate: <mml:munder> <mml:mi>A</mml:mi> <mml:mi>˙</mml:mi> </mml:munder> In fact, it works nicely in MathPlayer and Mozilla. Simon Pepping DTD Development and Maintenance Elsevier s.pepping@elsevier.com www.elsevier.com/locate/sgmlReceived on Thursday, 31 July 2003 09:43:34 UTC

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