\feature

\feature

[Hans Hagen]

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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