docs: def purge_collection(keys):
      "Recursive purge of nodes with name and id"
      for key in keys:
          m = re.match(r'(.*) \((\d+)\)', key)
          name = m.group(1)
          node_id = m.group(2)
          value = render_value_for_node(node_id)
          print 'remove node with name:{0} and id:{1}'.format(name, node_id)
  
          delete_node(node_id=node_id)
          if isinstance(value, dict):
              purge_collection(value.keys())