Format

      structure-name  STRUCTURE

                      [ DESCRIPTION IS /*text*/ ]
                      [ NODESCRIPTION           ]
                      [                         ]

                      [ record-property   ]
                      [ NOrecord-property ] ... .
                      [                   ]

                      [ DELETE name . ] ...

                      [ included-name-change-clause ]
                      [ local-field-clause          ]
                      [ record-change-clause        ] ...
                      [ structure-change-clause     ]
                      [                             ]
                      [ variants-change-clause      ]

                      END [ structure-name ]  STRUCTURE  .