There should be some kind of version control of the lexicon. One way of doing this would be to have the history of lexicon changes in MediaWiki and push a version to the TTS server when changes should go live.
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A few comments after discussing it a bit at the office:
Pushing the corrections made on Wikipedia to the TTS-server requires a open port, and some sort of security mechanism. to prevent that some unauthorized updates.
On MediaWiki there also need to be appropriate access rights and permission levels (rättighetsnivåer).