Quote:
Originally Posted by HarryT
An ePub is a file which conforms to the ePub file format specification - there are various validation tools available which will check an ePub for conformance to the standard.
A file that contains "extra" content may well be displayed (with greater or lesser success) by an ePub viewer, but it can't correctly be described as an ePub file - at least, not one than conforms to the ePub specification. If you have a looser definition that an ePub file is a file that an ePub viewer will display, then it may certainly fit your definition, but you'll struggle to find anyone who will accept that definition as valid.
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Do you consider epub2 to be an epub format?