Storing the version will make it possible to handle files with different variants/version of the standard correctly. This is useful in case we ever need or want to break compatability.
Addressing this via discussion on the CREATE mailing list and http://www.freedesktop.org/wiki/Specifications/OpenRaster/Draft/VersionNumber
Now incorporated into the stack.xml spec.
on Dec 04, 2016 at 08:08:04.
(provided by the Example extension).