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I've searched through the specs on the OPF 2.0 package, and don't seem to find a specified DOCTYPE. I was trying to use a third-party tool to validate an .opf file and it needs a DOCTYPE. I can use this tool to validate my XHTML files and my .ncx file, but not my .opf file.
If any of these questions seem stupid, please bear with me, as all this XML stuff is new to me. I'm trying to learn at least enough to deal with epub.
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