Re: mathcolor attribute in MathML (mkiv)

[Hans Hagen <j.hagen@xs4all.nl>]

On 5/27/2021 6:30 PM, Duncan Hothersall wrote:
> Apologies Hans.
> 
> MWE:
> 
> \usemodule[newmml]
> \starttext
> \xmlprocessdata{}{<formula>
>   <math xmlns='http://www.w3.org/1998/Math/MathML 
> <http://www.w3.org/1998/Math/MathML>'>
>    <mi>E</mi>
>    <mfenced>
>      <mo mathcolor="red">π</mo>
>    </mfenced>
>   </math>
> </formula>}{}
> \stoptext
> 
> The π symbol does not show in red.
Kind of trivial ... i'll send you a patched module.

If you want you can check with the standard and see where we need to add 
it. I'll then adapt the mkiv file before taking a look at upgrading the 
lmtx one.

For decades this mathml stuff has been a bit of a pain, because when one 
uses it for a mixed web / text project one always needs to satisfy the 
latest greatest either or not bugged web rendering, it disappearing from 
browsers, coming back, rendered remote or in the browser, mixed 
(in/with) asciimath which has its own tweaks. A pitty that content 
mathml never took off, probbably also due to the failure of openmath 
which took away attention from it and that we actually sort of 
support(ed). So when it comes to (reasonable quality) rendering in print 
one always runs a bit behind.

I'm also always a bit hesitant to touch the code because it's actually 
used by a collegue in some (zero budget, so me looking at the mml is 
just hobbying) projects concerning math school books where often the web 
part controls the limitations and enforces weird coding (tens of 
thousands of files with plenty mathml). Btw, especially symbols are a 
mess and interfere with assumed structure, so that's always tricky to 
touch. Especially when you want to have it specific for (mid/high) 
school math.

But anyway things like a bit of color and so are not that hard to 
support (more a matter of making sure performance is not hit).

Hans

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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