| A Layer is a collection of Features or rasters building a thematic 'unit' waterways
or country borders for example. Features or raster can be added or removed from the
layer. A Feature or raster can e changed by a modul of the application using the layer
because only references to Features or rasters are stored within a layer.
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author: Andreas Poth version: $Revision: 9340 $ $Date: 2007-12-27 04:32:12 -0800 (Thu, 27 Dec 2007) $ |