Quote:
Originally Posted by llasram
The relevant place to check is whether or not @id and @name attributes (type ID and NAME) are allowed to begin with a number, which they are not. See http://www.w3.org/TR/html401/types.html#h-6.2 for details. (XHTML, which is the relevant spec for EPUB, does not differ from HTML 4.0 on this point.)
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Aha, there was additional restriction. So then this is a bug in Calibre that it generated ePub files that do not follow the specification.