More robust parsing of OGC webservice responses

[JonasGilg]

The OGC-Webservices, like WCS respond with an xml document. Some of them use xml namespaces, some don't. Sadly CosmoScout VR's xml parsing library TinyXML doesn't support namespaces and thus the user of the library has to specify them as the part of the elements name.

Here are two examples of how a response can look like:

<Capabilities xmlns="http://www.opengis.net/wcs/2.0" ... />
or
<wcs:Capabilities xmlns:wcs="http://www.opengis.net/wcs/2.0" ... />

The easiest solution is to provide the namespace prefix for each namespace as part of the config:

"csp-visual-query": {
  "port": 9999,
  "wcs": [
    { 
      "url": "https://geoservice.dlr.de/eoc/elk/wcs",
      "namespaces": {
         "wcs": "", // or undefined?
         "ows": "ows:"
       }
     }
  ]
}

A more sofisticated solution then either uses a library that supports xml namespaces or parses the root element itself.

An example query with all the namespaces: https://geoservice.dlr.de/eoc/atmosphere/wcs?SERVICE=WCS&REQUEST=GetCapabilities