TODO: Document.

def search_qualification_types(self, query=None, sort_by='Name',
                                   sort_direction='Ascending', page_size=10,
                                   page_number=1, must_be_requestable=True,
                                   must_be_owned_by_caller=True):
        """TODO: Document."""
        params = {'Query' : query,
                  'SortProperty' : sort_by,
                  'SortDirection' : sort_direction,
                  'PageSize' : page_size,
                  'PageNumber' : page_number,
                  'MustBeRequestable' : must_be_requestable,
                  'MustBeOwnedByCaller' : must_be_owned_by_caller}
        return self._process_request('SearchQualificationTypes', params,
                    [('QualificationType', QualificationType),])