From: <w3@karlt.net>

Date: Thu, 31 Jan 2008 19:24:58 +1300

CC: davidc@nag.co.uk

To: www-math@w3.org

Message-ID: <877ihqa4w5.fsf@karlt.net>

Date: Thu, 31 Jan 2008 19:24:58 +1300

CC: davidc@nag.co.uk

To: www-math@w3.org

Message-ID: <877ihqa4w5.fsf@karlt.net>

Thanks for looking into this David, and for your explanations. >> jmath > > This is mapped to the base plane partly for compatibility with imath > and partly for better functionality with mathml's mathvariant attribute. > imath ... > I think there are some benefits in mapping it to the base plane. > <mi mathvariant="bold">x</mi> (for any variant) > is defined as a Unicode to Unicode mapping, you take the base character > and define the construct as being equivalent to the Unicode specified > mathematical bold character. If you put a styled character in the mi in > the first place mathvariant isn't supposed to have any effect. > So my understanding is that with jmath defined as it is, > <mi mathvariant="bold">ȷ</mi> > is a bold dotless j, but if jmath mapped to 1D6A4 then it would not be. > (Same argument for imath of course) Now MathML3 could change the rules > but that's my understanding of the rules for MathML2. Although my initial thoughts on this were that this sounded something to be taken into account, after more consideration, I'm not so sure. IIUC MathML2 intends mathvariant only for Unicode to Unicode mappings (because some/many applications weren't designed to handle SMP characters), not for applying style. http://www.w3.org/TR/2003/REC-MathML2-20031021/chapter3.html#presm.commatt "It is important to note that only certain combinations of character data and mathvariant attribute values make sense. ... By design, the only cases that have an unambiguous interpretation are exactly the ones that correspond to SMP Math Alphanumeric Symbol characters, which are enumerated in Section 6.2.3 Mathematical Alphanumeric Symbols Characters. In all other cases, it is suggested that renderers ignore the value of the mathvariant attribute if it is present." This provides that <mi>∞</mi>, for example, does not have any slant applied. Renderers following this suggestion would not currently render <mi>ı</mi> LATIN SMALL LETTER DOTLESS I with an italic style. Karl.Received on Thursday, 31 January 2008 06:26:57 UTC

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