OgcLayer instances are sufficient to produce visual rasters as the end product of 'get map'
requests. They are produced from a combination of a WMS 'GetMap'
(or whatever the analogous request in whatever OGC service is being produced) and an instance
of OgcSource
OgcLayer instances are sufficient to produce visual rasters as the end product of 'get map' requests. They are produced from a combination of a WMS 'GetMap' (or whatever the analogous request in whatever OGC service is being produced) and an instance of OgcSource