Metadata embedded in PDF

I want to create some PDFs with metadata embedded in such a way that Zotero would recognise it and signal the fact when the PDF opened in FF.

Could someone please point me at the right format to do this: it's supposed to be possible with XMP, but my experience at the moment is limited to adding Z39.88 support to my document web pages for Zotero.

I have people who can do the programming, but I need information about getting the format and fields right.

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