Parse the provided element as an aggregate.

def parse_at_element(
            self,
            element,  # type: ET.Element
            state  # type: _ProcessorState
    ):
        # type: (...) -> Any
        """Parse the provided element as an aggregate."""
        parsed_dict = self._dictionary.parse_at_element(element, state)
        return self._converter.from_dict(parsed_dict)