The PAGE clause defines the length of a logical page and the vertical
  subdivisions within which report groups are presented.

  Format -

   PAGE [ LIMIT IS   ] page-size [ LINE  ]
        [ LIMITS ARE ]           [ LINES ]

      [ HEADING heading-line ]

      [ FIRST DETAIL first-detail-line ]

      [ LAST DETAIL last-detail-line ]

      [ FOOTING footing-line ]