def get_media_descriptions_metadata(self):
metadata = dict(self._media_descriptions_metadata)<EOL>metadata.update({'<STR_LIT>': [t['<STR_LIT:text>'] for t in self.my_osid_object_form._my_map['<STR_LIT>']]})<EOL>return Metadata(**metadata)<EOL>
Gets the metadata for all media descriptions.

        return: (osid.Metadata) - metadata for the media descriptions
        *compliance: mandatory -- This method must be implemented.*