Just think about this issue as follows: EPUB gets processed with XML tools. XML tools use XML schema validation. The validation fails for an invalid EPUB input file. What are web services supposed to do in such a case? The initial post about <u> invalidity didn't mention if this issue was raised by a web service or processing tool or if the user just did a validation voluntarily, but at least he posted the issue and asked for a solution. Can he solve it in Calibre? Manually or automatically?
Last edited by skreutzer; 04-18-2014 at 04:44 PM.
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