Screen description entry.

Format.

          level-number [ data-name ]
                       [ FILLER    ]

                             [ PLUS  ]
        [ LINE [ NUMBER IS ] [ +     ] { identifier-1 } ]
                             [ MINUS ] { integer-1    }
                             [ -     ]

          { COL      }               [ PLUS  ]
        [ { COLUMN   } [ NUMBER IS ] [ +     ] { identifier-1 } ]
          { POSITION }               [ MINUS ] { integer-1    }
                                     [ -     ]

        [ BLANK { SCREEN } ]
                { LINE   }

                { [ END OF ] SCREEN }
        [ ERASE { [ END OF ] LINE   } ]
                { EOS               }
                { EOL               }

        [ FULL ]

        [ AUTO ]



        [ { SECURE } ]
          { OFF    }

        [ REQUIRED ]

        [ { BELL } ]
          { BEEP }

        [ BLINK ]

        [ { HIGHLIGHT } ]
          { HIGH      }

        [ { LOWLIGHT } ]
          { LOW      }

        [ REVERSE-VIDEO ]

        [ UNDERLINE ]

        [ { FOREGROUND-COLOR  } [ IS ] { identifier-2 } ]
          { FOREGROUND-COLOUR }        { integer-2    }

        [ { BACKGROUND-COLOR  } [ IS ] { identifier-2 } ]
          { BACKGROUND-COLOUR }        { integer-2    }

        [ { PICTURE } [ IS ] character-string-1 ]
          { PIC     }

        [ BLANK [ WHEN ] { ZERO   } ]
                         { ZEROS  }
                         { ZEROES }

        [ { JUSTIFIED } [RIGHT]
          { JUST      }

        [ [ SIGN [IS] ] { LEADING  } [ SEPARATE [ CHARACTER ] ] ]
                        { TRAILING }

        [ FROM { identifier-5 } ]
               { literal-5    }

        [ TO { identifier-6 } ]

        [ USING { identifier-6 } ]

        [ VALUE [ IS ] literal-7 ]

        [ OCCURS integer-5 [ TIMES ] ]

        [ [ USAGE ] [ IS ] DISPLAY ]

        [ PROMPT [ CHARACTER IS ] { identifier-8 }
                                  { literal-8    }

        .