@abc.abstractmethod<EOL><INDENT>def convert_formats(self, source_texts):<DEDENT>
return<EOL>
Converts formats.

        :param source_texts: the strings to convert
        :type source_texts: ``string[]``
        :return: the resulting strings
        :rtype: ``string``
        :raise: ``InvalidArgument`` -- a ``source_text not of source format``
        :raise: ``NullArgument`` -- ``source_texts`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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