[NTG-context] Examples of MathML in Context

Hi, I've just looked at three documents from Hans ('mmlexamp.pdf', 'mmlprime.pdf', 'mmoexamp.pdf'), and they all show nice examples of MathML and what you can accomplish using it. However, I wasn't able to find an example of how to actually insert MathML in a Context document. I imagine it's probably something like that: \starttext (...) \startMathML (...) \stopMathML (...) \stoptext Does anyone knows of an example on how to do that properly? Thanks, Maurício