Untill someone changes the validation tools, yes.
Please keep in mind that adding media is only support as of ePUB v3, which is not yet finalized afak.
Until then the support will be minimal and up to the specific interpretation of the reader. That mean that most readers will not support it and that the readers/reader application that does support only support their interpretation of it. It is uncertain that the implementation that iBooks uses is conform the final specs.
Last edited by Toxaris; 10-21-2011 at 01:51 PM.
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