ogc wms 1.1.1 - Nested layers
-----------------------------

                 Key: GEOS-3273
                 URL: http://jira.codehaus.org/browse/GEOS-3273
             Project: GeoServer
          Issue Type: Improvement
          Components: WMS
            Reporter: Milo van der Linden
            Assignee: Andrea Aime


As described in paragraph 7.1.4.4 of the Official OGC wms 1.1.1 specification 
(http://portal.opengeospatial.org/files/?artifact_id=1081&version=1&format=pdf)

We would like to be able to assign a Layer-group For WMS to act as a parent for 
the underlying layers, making it possible to show layers through the 
GetCapabilities in the following way

<Layer>
 <Name>the defined grouplayer name</Name>
 ...
 <Layer queryable="1">
   <Name> the REAL layer 1</Name>
   ....
 </Layer>
 <Layer queryable="1">
   <Name> the REAL layer 2</Name>
 </Layer>
...
</Layer>

7.1.4.4   Layers and Styles

The most critical part of the WMS Capabilities XML is the Layers and Styles it 
defines.
Each available map is advertised by a <Layer> element in the Capabilities XML. A
single parent Layer encloses any number of additional layers, which may be
hierarchically nested as desired. Some properties defined in a parent layer are 
inherited
by the children it encloses. These inherited properties may be either redefined 
or added
to by the child. Section 7.1.4.7 defines whether or how each property is 
inherited.
A Map Server shall include at least one <Layer> element for each map layer 
offered. If
desired, layers may be repeated in different categories when relevant.




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