Back in the day when Corel released Draw 11 if I remember correctly, it was called X1 the X referring to the 10 versions before it.
So at present CorelDraw is at version X8, which makes perfect sense. Xara's numbering appears to be rather haphazard and is, in my opinion responsible for all the queries about which is the latest version. This is aside from all the different versions for the web and Page Layout and whatnot.
It's not very coherent, at least, it's not to me.
Bob.