Aaaaaand once again I post too soon!
I searched again and found Ticket #3743: PML Metadata Missing. This references PML OUTPUT rather than input, but part of John's comment pretty much tells the whole story:
I have no interest in writing a PML metadata reader or writer. Meaning unless someone else contributes it I won't get around to doing anything with it in the near future.
Alrighty! That answers that question. I've done some in-house Calibre pre-processing plugins, but Metadata is a new one for me. Time to do some reading of the Calibre manual.
- Jim
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