[NTG-context] Math and MATHML problem

[Wolfgang Zillig]

Hello,

I'm trying to typset some math.

when I use \startbuffer ...here mathml ...\stopbuffer and a following
\processXMLbuffer I get a nice centered formula. When I save that code
to a file  myeq1.xml and try to include it with
\processXMLfile{myeq1.xml}I compillation stops at that point.
\processXMLfilegrouped{myeq1.xml} produces a formula again but 2
additional symbold appear at the beginning of the formula.

Questions:

- What is my fault?

- Whow can I set the alignment of formulas (ie leftaligned)?

Thanks for any help


\usemodule[mathml]
\defineXMLentity [PartialD] {\getXMLentity{differentiald}}
\starttext


\startbuffer
<math xmlns="http://www.w3.org/1998/Math/MathML"; display="block">
 <mrow>
   <mi>q</mi>
   <mo>=</mo>
   <mfrac>
     <mrow>
       <mo>&PartialD;</mo>
       <mi>p</mi>
     </mrow>
     <mrow>
       <mo>&PartialD;</mo>
       <mi>x</mi>
     </mrow>
   </mfrac>
   <mo>=</mo>
   <mo>&PartialD;</mo>
   <mfenced>
     <mrow>
       <mi>&phi;</mi>
     </mrow>
   </mfenced>
   <msub>
     <mi>p</mi>
     <mrow>
       <mi>v</mi>
       <mi>s</mi>
       <mi>a</mi>
       <mi>t</mi>
     </mrow>
   </msub>
   <mfenced>
     <mrow>
       <mi>&theta;</mi>
     </mrow>
   </mfenced>
   <mfrac>
     <mrow>
       <mo>&PartialD;</mo>
       <mi>&phi;</mi>
     </mrow>
     <mrow>
       <mo>&PartialD;</mo>
       <mi>x</mi>
     </mrow>
   </mfrac>
 </mrow>
</math>


\stopbuffer


\processXMLbuffer

\stoptext


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