We're going to have structured UUIDs for books, in addition to a field for ISBNs, but that depth of analysis is pointless, when you also have the source in the same database because you can have AI analyze the text and add a label event telling _you_ what it is. 

 Or someone who has read the text and wants to curate manually can just add their own label.

I'm going to add a "Bible" label to everything that looks to me like a Bible. 🤷‍♀️