@abc.abstractmethod<EOL><INDENT>def get_currency_types_for_source(self, source_currency_type):<DEDENT>
return<EOL>
Gets the list of target currency types for a given source currency type.

        :param source_currency_type: the type of the source currency
        :type source_currency_type: ``osid.type.Type``
        :return: the list of supported currency types
        :rtype: ``osid.type.TypeList``
        :raise: ``NullArgument`` -- ``source_currency_type`` is ``null``

        *compliance: mandatory -- This method must be implemented.*