dtb:revision
Non-negative integer value of the specific version of the DTB. Incremented each time the DTB is revised.
Occurrence: Optional. Not repeatable.
dtb:revisionDate
Date associated with the specific dtb:revision. In format from [ISO8601]
Occurrence: Optional. Not repeatable.
dtb:revisionDescription
A string describing the changes introduced in a specific dtb:revision.
Occurrence: Optional. Not repeatable.
I'm not sure how useful this is. It is contained in the DTB spec, but if it is used in practice I do not know. We at SBS do not use it.
According to the Specifications for the Digital Talking Book:
I'm not sure how useful this is. It is contained in the DTB spec, but if it is used in practice I do not know. We at SBS do not use it.