docs: def _get_extended(scene, resp):
      """
      Parse metadata returned from the metadataUrl of a USGS scene.
  
      :param scene:
          Dictionary representation of a USGS scene
      :param resp:
          Response object from requests/grequests
      """
      root = ElementTree.fromstring(resp.text)
      items = root.findall("eemetadata:metadataFields/eemetadata:metadataField", NAMESPACES)
      scene['extended'] = {item.attrib.get('name').strip(): xsi.get(item[0]) for item in items}
  
      return scene