I've scoured the Interwebs without success. I know that basic metadata can be added to the pdf catalog using various packages, and have used
pdfx especially for this. I have no difficulty putting into the final pdf metadata concerning the entire document.
However, I'm now typesetting a volume of multiple independent works, which share no metadata other than being put in the same volume. They have different titles, authors, different copyright statuses, and so forth. Is it possible to include metadata for each individual part of the volume?
E.g., in addition to the information about the document as a whole (say, "Great American Short Stories"), can I include data about the individual stories within it (say, "Young Goodman Brown," "The Fall of the House of Usher," and so forth)?