getLegendGraphic: support of pre-rendered images
------------------------------------------------

                 Key: GEOS-3747
                 URL: http://jira.codehaus.org/browse/GEOS-3747
             Project: GeoServer
          Issue Type: Improvement
          Components: WMS
    Affects Versions: 2.0.0
         Environment: Intel Core i5, Windows XP SP3
            Reporter: Frank
            Assignee: Andrea Aime
            Priority: Minor
         Attachments: legendgraphic.patch

It might be a good idea to enable a user to specify a pre-rendered image file 
as legend graphic, especially for raster data.

In the SLD-Definition, a user can already set up such a graphic file with the 
element <LegendGraphic>, but this element is currently not interpreted by 
geoserver.

Attached is a patch for a (very basic) version, which interprets the element 
<LegendGraphic> and delivers the file given in <Graphic> -> <ExternalGraphic> 
-> <OnlineResource>.

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