Interwiki rule by Text_Wiki

Hello,
Still working out a better integrated Wikilink / Image / Interwiki rules 
parser, I stumble against the following Interwiki problem.

By Mediawiki, Interwiki are done as [[otherwiki:page]] otherwiki 
adressing a table, Interwiki Map, similar to the render configuration 
"sites" we have by Interwiki rule.

The difficulty is that the [[prefix:something]] has a fairly wider use 
(roughly):
* namespace: prefix is then a part of the page name,
* special namespace as Image, Talk, User, Special ...
* interwiki or sister projects,
* interlangage link: it links to the corresponding page in a different 
langage,
* ... or a combination of them.
(next Mediawiki parser will treat in a once Image, Wikilink and Interwiki)

Then, obviously, it has to be proceeded by the parsing time and not, as 
we do currently, by the rendering.
Generaly, it seems to me that this is much more natural, I don't 
understand why the "sites" list belongs to the render configuration.
Proof of concept: for the 3 basic renders: you have to duplicate this 
configuration between Xhtml and Latex, Plain simply ignoring the url 
translation and outputing the interwiki keyword (?).
As any duplication this leads to extra work by configuration and 
possible inconsistency.

I plan to introduce the possibility to have the url transcription done 
by the parser.