Math align with \startcases

[Otared Kavian <otared@gmail.com>]

Hi everyone,

This question is primarily intended for Aditya… but I guess other  
fellows on the list can also help me solve the following alignment  
problem:
Is it possible to have an alignment like the rsult of the following  
with \startcases...\stopcases?

\starttext

\startformula
  \startmatrix[align={right,left,right},distance=3pt,left={\left\{},  
right={\right.}]
    \NC -\Delta u + g(u) \NC{} = f \NC \quad\mbox{in } \Omega\NR
    \NC \displaystyle {\partial u \over \partial {\bf n} } \NC{} =  
h(u) \NC \quad\mbox{on } \partial\Omega   \NR
  \stopmatrix
\stopformula

\stoptext

Actually I used to have such alignments with the following structure  
(in good old plain TeX...):

\starttext

\startformula
\cases{
\eqalign{
  -\Delta u + g(u) &= f \cr
  \displaystyle {\partial u \over \partial {\bf n} } &= h(u) \cr
} \quad \eqalign{
&\hbox{in } \Omega \cr
&\vphantom{{\partial u \over \partial {\bf n} }} \hbox{on } \partial 
\Omega \cr
}
}
\stopformula

\stoptext

(which gives approximately the same result as the first example above,  
but clearly the math-alignment structure set up by Aditya and Hans is  
much more elegant. (Although I prefer the vertical distance between  
the lines obtained with my plain TeX structure: by the way is it  
possible to fine tune such things in ConTeXt).
So my question is: whether one can use \startcases ...\stopcases  
instead of \startmatrix ... \stopmatrix in order to obtain the result  
of the plain TeX example?

Thanks in advance: OK
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