Quote:
Originally Posted by Hadrien
Should be allowed as long as you've set up a DTBook or XHTML flow as the fallback.
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Actually, I'm not sure the OPF spec allows that. The only reference it makes to an item with one of the OPS Core Media Types having a fallback is:
Quote:
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For the purpose of fallback specification, the file with the media type application/x-dtbncx+xml that specifies the publication’s NCX (see below) should be considered a Core Media Type, thus fallback information must not be provided for this file.
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The "
thus fallback information must not be provides" bit is what gets me. Instead of making NCX a special exception which must not have fallback information provided, the spec makes it one of the Core Media Types and implies that
because of this it is disallowed from having a fallback.
Is disallowing such fallbacks actually useful? I can't think of a good reason for it.