title: Does spatialite/mysql support 3D point?
body: <p>Recently, I was studying spatialite.I can write 2D data(like this:POINT(1 1)) into the spatial data table,but I can't write 3D data(like this:POINT(1 1 1) ) into the spatial data table.
   Who can tell me spatialite whether support 3D? If support ,how can I write a 3D data?</p>