Revision hashes?

[DCNemesis]

Consider: We may have multiple revisions come to us of the same Bible, but not have a date for either. If we allow some value for unknown date, we won't be able to tell two revisions except at the verse level. And if we have another that we're considering adding, we might not know if it is one of the two unknowns or yet a third unknown.

Possible solution: If we have an intermediate representation of these Bibles that is aligned to a single versification and otherwise "clean" ... it might make sense to store a hash of the revision so we can easily check if it already exists.