>> Is it possible to use MathML inside
>> a Metapost or Metafun label?
>
> I'm not 100% sure, but \sometxt{... your ConTeXt stuff with mathml
> here ...} could work.

It seems a good idea. But, actually, I should have learned
how to insert MathML in Context in the first place. Do
you know a good doc on that? I can find hundreds of MathML
examples in the wiki, but none of them are inside Context
documents.

Thanks,
Maurício