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Ahh, You can read about ePub in our wiki and I am pretty sure these are not legal in xhtml. The wiki has links to the specs. While xhtml is designed after xml it is really designed to make html conform to the standards of xml, not to turn it into some arbitrary xml. Hope this helps. Certainly you are right, many ebook readers will not interpret these like xml. They are all basically designed for html that conforms to xml and this is what the spec says.
Dale
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