Re: [LaTeXML] Fwd: Special TeX/LaTeX fonts in MathML (calligraphy vs. script)

On 16/07/2014 22:44, Fr=E9d=E9ric Wang wrote:
> It's because you are talking about the syntax of the MathML markup =

> while I'm talking about its semantics. AFAIK, using a class name =

> "MJX-..." to change the rendering behavior of elements other than by =

> CSS styling is non-standard =3D not defined in any standard. =


It's not defined by MathML but it is explicitly not defined (thus =

allowed) by MathML, the definition of class(in 2.1.6) is

 > Associates the element with a set of style classes for use with =

[XSLT] and [CSS21].
 > Typically this would be a space separated sequence of words, but this =

is not specified by MathML.

so it explicitly sanctions XSLT transforms rather than css to pick up =

the class:
times and language fashions change, but using javascript rather than =

xslt isn't really any different.

If different systems are using <mi class=3D"wibble" mathvariant=3D"script">=
  =

to distinguish calligraphic rather than script,
then some kind of note or even informal agreement to use the same class =

names is probably a pragmatic solution.
whether they use css or c++ or javascript to cause that class attribute =

to have any effect isn't really the concern of the MathML spec.

 From the mathml spec viewpoint that's really saying that a script A and =

calligraphic A are the "same" but one is just styled differently
In some cases that is definitely a reasonable description of reality.  =

I'm sure though there are some documents that use the two
alphabets in an intentionally distinct manner. using class for that is =

arguably less than ideal however the alternative of getting
a new calligraphic alphabet added to unicode and (perhaps) a new =

calligraphic mathvariant to match , and then getting fonts updated
to use the new Unicode code has lots of procedural and time =

disadvantages, it would take years to get deployed and if used would
probably have bad fallback in systems without updated fonts. That's not =

to say it shouldn't be attempted. Especially if browser and font
implementers all asked for that, and there were published documents =

using both forms in the same expression....

David