>We are currently looking for ways to do spatial calculations against
>records stored within an eXist database. Our records already hold
>address data and the sort of thing we want to do is to find records
>that have an address within a certain radius of a given point.
>I see that there is now a spatial extension module for eXist which
>has some interesting looking functions - but I am not too familiar
>with the workings of GIS so am unclear whether these functions are
>really what we want or what the prerequisites are for using them. I
>would be grateful for any pointers on this.
The spatial index indexes GML geometries
(http://www.opengeospatial.org/standards/gml). I've also provided a set=
spatial functions that would make the operation you describe pretty
straightforward (searching the geometries intersecting a buffer around =
reference point would be a good approach).
More info there :