Am 13.11.2008 um 20:52 schrieb Alan STONE:

> Hi,
>
> With \definelayout[myLayout][...], how do you test whether one of
> its parameters has a certain value, is greater than 0, etc... ?

\definelayout
[mylayout]
[backspace=3cm,
width=12cm]

\starttext

\doifdimensionelse{\namedlayoutparameter{mylayout}{width}} % width
could be 'fit'
{\ifdim\namedlayoutparameter{mylayout}{width}<10cm
...
\else
...
\fi}
{\processaction
[\namedlayoutparameter{mylayout}{width}]
[fit=>...,
unknown=>...]}

\stoptext

Wolfgang