[OpenLayers-Trac] [OpenLayers] #2920: Make consistent metadata, legend layer attributes aread/write in Format.WMC

[OpenLayers]

#2920: Make consistent metadata, legend layer attributes aread/write in Format.WMC
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 Reporter:  jachym                      |       Owner:  tschaub     
     Type:  feature                     |      Status:  new         
 Priority:  minor                       |   Milestone:  2.11 Release
Component:  Format.WMC                  |     Version:  2.10        
 Keywords:  metadata, legend, abstract  |       State:              
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 In 2.10 (trunk), the legend and metadata attributes of layer are not read
 and written consistently in Format.WMC.

 This patch adds more structured metadata attribute, with href, type and
 format attributes, introduces new legend layer attribute (href, width,
 height), and introduces new layer abstract attribute.

 Everything is read/written to given layer in consistent way.

 Test included (but will have to be probably split into several WMC*
 tests).

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Ticket URL: <http://trac.openlayers.org/ticket/2920>
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