code: def parse_at_root(
              self,
              root,  # type: ET.Element
              state  # type: _ProcessorState
      ):
          # type: (...) -> Any
          
          parsed_dict = {}  # type: Dict
  
          dict_element = _element_find_from_root(root, self.element_path)
          if dict_element is not None:
              parsed_dict = self.parse_at_element(dict_element, state)
          elif self.required:
              raise MissingValue('Missing required root aggregate "{}"'.format(self.element_path))
  
          return parsed_dict
docs: Parse the root XML element as a dictionary.