Hmm, in many ways.
Actually it is just an indexing system for events in multiple dimensions. (In this case dimensions as in topological dimensions x,y,z,xx,yy,zz, etc as opposed to planes of existence)
One might suspect one could find other indexing systems, create an alternate index for events in the various dimensions. I think that would be quite interesting to explore. Hmm, maybe I shall. [color=brown] [i]Puff Puff[/i] [/color]