"grafcan-ou":  { \
     "name": "OrtoExpressUrbana",
     "prefix": "OrtoExpressUrbana",                   # tile directory
     "ext": "jpg",                      # tile images extension
     "scalable": False,                 # could zN tile be constructed of four z(N+1) tiles
     "fetch": fetchers.WMS, # function that fetches given tile. should return None if tile wasn't fetched
     "remote_url": "http://idecan1.grafcan.es/ServicioWMS/OrtoUrb?FORMAT=image/jpeg&VERSION=1.1.1&SERVICE=WMS&REQUEST=GetMap&Layers=OU&", # string without srs, height, width and bbox
     "max_zoom": 23,
     "proj": "EPSG:4326",
     "wms_proj": "EPSG:4326",  # what projection to ask from wms
},\