@utilities.arguments_not_none<EOL><INDENT>def get_maximum_heading_values(self, heading_type):<DEDENT>
raise errors.Unimplemented()<EOL>
Gets the maximum heading values given supported heading type.

        arg:    heading_type (osid.type.Type): a heading Type
        return: (decimal) - the maximum heading values
        raise:  IllegalState - syntax is not a ``HEADING``
        raise:  NullArgument - ``heading_type`` is ``null``
        raise:  Unsupported - ``supports_heading_type(heading_type)`` is
                ``false``
        *compliance: mandatory -- This method must be implemented.*