[NTG-context] math tests - subformula ref's and symbols \oiint \oiiint like in Latex AMS

[Wim Neimeijer]

Hi, 
I am using Context for the second time now and I am investigating 
the pro's and con's before migrating my Latex documents to Context. 
So far I am really impressed with Context capabilities. 
Now I am testing some of the math I typeset with Latex to 
determine whether or not to use Context. 
In Latex I am using the ams math packages and knowing that there is 
a amsl module for Context I did some test such as 
\def\wdiv{{\rm div} \:} 
\def\rot{{\rm rot} \:} 
\placeformula[eqn1] 
\startformula 
\eqalignno{ 
\wdiv \vec{E} & = \frac{\rho}{\epsilon_{0}} &\formulanumber{.a} \cr 
\rot \vec{B} & = \mu_{0} \:\vec{j} &\subformulanumber{.b} \cr 
\wdiv \vec{B} & = 0 &\subformulanumber{.c} \cr 
\rot \vec{E} + \frac{\partial \vec{B} }{\partial t} & = 0 &
\subformulanumber{.d} \cr} 
\stopformula 
How can I refer to these subformulas in my running text ? 
As I am typesetting a lot of math in my physics doc's I use a lot of
integration symbols amongs others. 
In Latex I use \oint, \oiint and \oiint, even a quadruple int to indicate
space - time integrals. Even I defined 
a tex command for the surface integral. 
I also found the Context \showmathcharacters which gave me most of the math
symbols from the amsl module. 
However I did not found alternatives for \oiint, \oiiint unfortenately. 
I discovered the \definemathsymbol in several context tex files, I was
wondering if it is possible to 
setup my own \oiint, \oiiint, \oiiiint ... symbols ? If yes, my problem is I
can't find any docu's on the usage of \definemathsymbol ?
Any help appreciated 
Kind regards 
W.Neimeijer 

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