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Yes with solution 1 and 2, ie without pdfx you can use \@title \@author and \@date. Provided you do it before \maketitle, or patch it to avoid erasure. My answer was related to solution 3, as a macro in a filecontents environment will be written verbatim in the file. So you will need a specific \write with small problems of encoding if you use letters out ...

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I don't know anything about hyperxmp, but for sure pdfx package loads xmpincl to handle the expected XMP metadata. Your problem could arise from a slight syntax confusion. 1. Your approach \hypersetup{ pdftitle={\@title}, pdfauthor={\@author}, pdfcreator=pdfLaTeX, pdfproducer={\@author}, } should work, as long as : you have loaded ...

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