[geos-devel] supporting filters

[Kralidis,Tom [Burlington]]

> Tom,
> 
> I'm also interested in some info about internals of DWithin 
> and Beyond operations.
> These both operations are supported by FDO 
> (http://fdo.osgeo.org) but unfortunately I've not found much 
> information about their specification.
>

True.  The only info I found was from FES 1.0.0, section 8.2:

"The spatial operators DWithin and Beyond test whether the value of a
geometric property is within or beyond a specified distance of the
specified literal geometric value."

So both DWithin and Beyond take as inputs a geometry and distance value.
 
> I also need to learn about it soon, so if I will find 
> anything I let you know.