What does this have to do with InDesign EPUB? What kind of metadata do they want exported (I'm assuming from InDesign)?
It's not a built-in feature. It would probably require a script. You might ask in the InDesign Scripting forum:
It's the EPUB metadata they want. Sorry that wasn't clear.
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Let us know if any of these gives you what you need.
Thanks, Pariah. I think if I need a longer-term solution, I'll pursue those. In the meantime, the client said a spreadsheet would be fine, so I just copied and pasted the data for their half-dozen or so books.