Location Shelf Life

In WGS84 and the Web, Allan Doyle notes that people are waking up to the fact that the current world geodetic system isn't going to be around forever.

Literal positions (whether in the http://www.w3.org/2003/01/geo/ or proposed http://georss.org style) are going to lose their meaning over time, whether from a change in geodetic systems, or continental drift. Rather than express location in XML like:


I think we need:


Users can be relieved of the responsibility of migrating their float values from one coordinate system to another on a per-document basis. The good folks at the fictional h2g2nis.net can take over the duty of preserving the accuracy and relevance of the Fort Collins location.

I'm sure that this is not a totally original idea, and would appreciate being clued in to prior art.