schema:version on CreativeWork : "The version of the CreativeWork embodied by a specified resource."
Often versions are not only numbers, but might use patterns like "x.y.z" (major.minor.path), or use version names ("sdo-deimos"), etc.
+1 also, we are likely to use this for describing datasets
let's do it!
Broadened /version to allow Text values.
Implemented and queued for next release review: http://webschemas.org/docs/releases.html#g1151