Hi,
After some experimenting, I settled on the next interface for dynamic
features:
The is also a generic command \type {\feature} that takes two arguments.
Below we show all calls, with long and short variants:
\starttyping
\addfeature [f:mine] \feature [more][f:mine] \feature[+][f:mine]
\subtractfeature [f:mine] \feature [less][f:mine] \feature[-][f:mine]
\replacefeature [f:mine] \feature [new][f:mine] \feature[=][f:mine]
\resetandaddfeature[f:mine] \feature[local][f:mine] \feature[!][f:mine]
\revivefeature [f:mine] \feature [old][f:mine] \feature[>][f:mine]
\resetfeature \feature[reset] \feature[<]
\stoptyping
Each variant also accepts \type {{}} instead of \type {[]} so that they
can conveniently be used in square bracket arguments.
This mechanism replaces \addff cum suis, although for a while they will
stay around (mapped onto add and subtract).
Idris is testing it (as he used this kind of trickery extensively for
complex arabic) and he make a nice wiki page.
We can think of a predefined set of simple features.
Hans
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Hans Hagen | PRAGMA ADE
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