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The JHOVE parser for PDF, which I maintain, will sometimes find a non-dictionary object in a PDF's Annots array. According to section 8.4.1 of the PDF spec, the Annots array holds "an array of annotation dictionaries." In the case that I'm looking at right now, there's a keyword of "Annot" instead of a dictionary. Is this an invalid PDF file, or is there a subtlety in the spec which I've overlooked?

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Upload the PDF if you want us to determine if the PDF is invalid or not. –  Rowan Jun 18 '13 at 5:15
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