#gRegorI have less experience with h-product. I think we usually see books marked up with https://microformats.org/wiki/h-cite, so perhaps that could be nested in the h-product
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#gRegorHowever the usual question we consider is: what is the consuming use-case? If there isn't one or it's hypothetical at this point, you may not need to add it.
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#[KevinMarks]The p-author h-card model from h-entry would be a reasonable fit for a book author