def _handle_start_center(self, attrs):
        """
        Handle opening center element

        :param attrs: Attributes of the element
        :type attrs: Dict
        """
        center_lat = attrs.get("lat")
        center_lon = attrs.get("lon")
        if center_lat is None or center_lon is None:
            raise ValueError("Unable to get lat or lon of way center.")
        self._curr["center_lat"] = Decimal(center_lat)
        self._curr["center_lon"] = Decimal(center_lon)
Handle opening center element

        :param attrs: Attributes of the element
        :type attrs: Dict