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Old 10-29-2014, 09:19 PM   #3
eschwartz
Ex-Helpdesk Junkie
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Posts: 19,421
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Join Date: Nov 2012
Location: The Beaten Path, USA, Roundworld, This Side of Infinity
Device: Kindle Touch fw5.3.7 (Wifi only)
I believe calibre can read and save xmp metadata for PDF.

For the usual ebook formats, MOBI, EPUB and AZW3, there are documented internal metadata formats.

EPUB uses Dublin Core attributes in the OPF inside the EPUB container.
AZW3 and MOBI use the mobipocket exth fields, which are database records.

I am not sure djvu and chm support metadadata. It really is up to the individual format specs.
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