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Originally Posted by llasram
XML isn't all just fun and games you know. There are serious implications to adding new tags willy-nilly!
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Aww shucks and here I was thinking XML parsing would be the new Betrayal at Krondor.
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What if the IDPF later adds a <series/> sub-element of <metadata/>, but specifies it as having a @name attribute for the series name and a text() of the (to calibre) series index?
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Then I would have to paraphrase Obelix and say "These IDPF are crazy..."
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Ok, probably not, but OPF comes with a RelaxNG schema for validation, which schema only allows the tags explicitly allowed by the OPF specs, yah?. Even if any sane OPF processor would ignore parts it didn't understand, extra-tag errors are strictly errors and should be emitted by a validity checker. The presence of "non-error errors" in the checker output makes it harder for a human to read the checker's output and verify whether or not the file is in fact "valid enough".
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That's really a sign that the validity checker's interface should be improved. But I agree, since it's an easy fix, we might as well fix it.
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Yeah... I'd actually vote for namespace-prefixing the Calibre-specific metadata in some fashion, to increase the chances of global uniqueness.
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In an ideal world, yeah, but then epubchecker would cry.