Capabilities of a W*S

OWSLib should behave more like Python's xmlrpclib. 

from owslib.wms import WMS

# create a WMS proxy
wms = WMS(url='http://foo.com/wms', version='1.1.1')

OWS capabilities should be a member of the proxy object in the same way that xmlrpclib proxies have a "system" member. Question is whether capabilities should be

  • 1) a flat object, sort of like what we're currently doing 
      layer_names = wms.capabilities.layernames()
  • 2) an infoset (ElementTree-style), the most "raw" option 
      layer_names = [n.text for n in wms.capabilities.findall('Capability/Layer/Layer/Name')]
  • 3) a mapping: 
      layer_names = [layer['name'] for layer in wms.capabilities['layers']]
  • or an object that contains other objects. A WMSLayerDescriptor class is implied here: 
      layer_names = [layer.name for layer in wms.capabilities.layers]

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