> On 11 Apr 2015, at 15:38, Hans Hagen <pragma@wxs.nl> wrote:
> […]
> What do you need then? Math is handled in several files.


Hi,

something like the following definition for \placeformularef below, which would work in multine formulas (I don’t know how to write in the margin next to the number of the formula).

The output is attached.

%%%%% begin placeformula-ref.tex
\def\placeformularef[#1]{\doifmodeelse{proofreading}%
	{\inrightmargin{\tt\txx #1}\placeformula[#1]}%
	{\placeformula[#1]}}

\definereferenceformat[eqref][left=(,right=),text={formula }]

\setupformulas[location=right]

\enablemode[proofreading]

\starttext
We have
\placeformularef[eq:Square]
\startformula
a^2 + 2ab + b^2 = (a + b)^2,
\stopformula
for $a,b\in {\Bbb C}$. Also,
\placeformularef[]
\startformula
\startalign
\NC |x|^2 + |y|^2 \NC = (x + y|x + y). \NR[eq:Pythagore]
\NC \alpha^2 -2\alpha\beta + \beta^2 \NC = (\alpha - \beta)^2. \NR[eq:Identity]
\stopalign
\stopformula  
\eqref[eq:Identity] is a consequence of \eqref[eq:Square].
\stoptext
%%%%% end placeformula-ref.tex

Thanks: OK