Hi Javier,
You won't be able to convert the entities but you can protect them as placeholder tags using the embedded content processor. Try this as a catchall... think it will get most:
&\w+;
If you want to go the other way then this won't be possible at all... you'd have to write the entities themselves. I guess you could do that with quick inserts, or maybe using autocorrect perhaps?
Regards
Paul
Paul Filkin | RWS Group
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