A Service is a frontend format for FeatureServer. Services parse requests --
including POST/PUT data, GET data via URL parameters and path_info, etc.

Currently included in FeatureServer are four Services:

 * JSON
   The default Service. Input and output is GeoJSON.
   Requires simplejson Python module.
 
 * GeoRSS Atom (Simple)

 * KML
 
 * GML/WFS
   This service is output only.