Validating Epub 3

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I'm using epubchecker to try and validate my epub 3 files. I keep getting the following error, but cannot see what it can be:

ERROR: ahis3c.epub/OEBPS/cover.htm(7,52): External entities are not allowed in XML. External entity declaration found: %OEBEntities
ERROR: ahis3c.epub/OEBPS/cover.htm(1,1): Entity '%OEBEntities' is undeclared

There are no oeb entities in the html
Can anyone shed any light on what the error can be?

Many thanks,


Im getting the EXACT same error. On the EXACT same lines (7,52) and (1,1). Very strange. I have no answer to what the problem is.

Is this a bug?

Probably your content docs and/or toc.xhtml contain an XHTML1.1 doctype - this "obsolete permitted" in HTML5, but forbidden in epub as external entities are not allowed. Agree that this is not the ideal error message from EPUBCheck - you might want to file a bug on the google code site about the %OEBEntities.

I am looking for guidelines (links) for fixed layout and epub 3. Please help

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