@utilities.arguments_not_none<EOL><INDENT>def set_unit_system_type(self, unit_system_type):<DEDENT>
self._unit_system_type = unit_system_type<EOL>
Sets the unit system type.

        arg:    unit_system_type (osid.type.Type): the unit system type
        raise:  NullArgument - ``unit_system_type`` is ``null``
        *compliance: mandatory -- This method must be implemented.*