def get_compositions(self):
<EOL>collection = JSONClientValidated('<STR_LIT>',<EOL>collection='<STR_LIT>',<EOL>runtime=self._runtime)<EOL>result = collection.find(self._view_filter()).sort('<STR_LIT>', DESCENDING)<EOL>return objects.CompositionList(result, runtime=self._runtime, proxy=self._proxy)<EOL>
Gets all ``Compositions``.

        return: (osid.repository.CompositionList) - a list of
                ``Compositions``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*