Question about rev attribute on booktitle in bookmap

Hi all, As I'm doing some cleanup in the bookmap grammar files, I noticed that a small inconsistency with the base grammar.
In DITA 1.3, we added the @rev attribute to the title element.
In bookmap, the <booktitle> element is based on the core title element -- but it did not get the same update.
Can we update the booktitle element to add the rev attribute, so that it is once again in sync with the attribute list on the base title element?
Thanks, Robert