After reading the document I still miss the good term for this level of versioning ("kind of version tag") to distiguish it from "usual" ConTeXt versioning.
Hans H., how do you want these versioning systems to be called?
? [date version] = ConTeXt ver: 2006.10.27 15:16 ? [mark version] = MK II
the mk versioning is only relevant for engines, i.e. mkiv will provide lua based implementations as well as in the future more functionality.
pdftex / xetex : mkii luatex : mkiv
in some sense, mkiv is a next generation context but downward compatible
thanks, made it clearer: not level of versioning, but axis of versioning. but still, how do we call it? mk version? and how we call the "usual" version then? i want to avoid confusion when speaking about version. guess which one ;) there is already a command \markversion, but it doesn't seem to have something in common with this versioning. jano