Very interesting, Paul. What exactly is the relationship with PostGIS? Jan Dr. J. Hartmann Department of Geography University of Amsterdam Paul Ramsey wrote: > http://jtc1sc32.org/doc/recent/32N1323T-FCD13249-3-SQLMM-Spatial%20.pdf > > Paul Ramsey wrote: >> Very useful link. Download it now while you still can. >> >> P >> > >