code: def chk_qualifiers(self):
          
          if self.name == 'id2gos':
              return
          for ntd in self.associations:
              # print(ntd)
              qual = ntd.Qualifier
              assert isinstance(qual, set), '{NAME}: QUALIFIER MUST BE A LIST: {NT}'.format(
                  NAME=self.name, NT=ntd)
              assert qual != set(['']), ntd
              assert qual != set(['-']), ntd
              assert 'always' not in qual, 'SPEC SAID IT WOULD BE THERE'
docs: Check format of qualifier