Sounds like a great idea. One question: would having an external but faithful XML Lyx file allow XLS-translations to XML-based word-processing formats? That would solve once and for all (hopefully) the problem of the Lyx-->Word conversion that still plagues those of us working in the Humanities (At least, it still affects me).
Stefano -- Yes!!! This is the whole idea behind a native XML schema .lyx file. Not only word but also excel, powerpoint, copy-paste inline, ... , and so on would be solved easily in this way. Alex