Thread: EPUBCheck v4.2.0
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Old 04-23-2019, 08:01 PM   #3
jhowell
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Any EPUB 3 should have a version of “3.0” in the OPF, even if it follows the 3.2 specification.

From EPUB Packages 3.2

Quote:
The version attribute specifies the EPUB specification version to which the given EPUB Package conforms. The attribute MUST have the value "3.0" to indicate compliance with this version of the specification.
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