code: def clean(self):
          
          if os.path.isdir(self.schema_mof_dir):
              shutil.rmtree(self.schema_mof_dir)
docs: Remove all of the MOF files and the `schema_mof_dir` for the defined
          schema.  This is useful because while the downloaded schema is a single
          compressed zip file, it creates several thousand MOF files that take up
          considerable space.
  
          The next time the :class:`~pywbem_mock.DMTFCIMSchema` object for this
          `schema_version` and `schema_root_dir` is created, the MOF file are
          extracted again.