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Section of Reference Page

RefSect1 = ( RefSect1Info?,
             ( Title, Subtitle?, TitleAbbrev? ),

             ( ( (%refcomponent.mix;)+,
                 RefSect2*
               ) |
               RefSect2+
             )
           )

RefSect2 = ( RefSect2Info?,
             ( Title, Subtitle?, TitleAbbrev? ),

             ( ( (%refcomponent.mix;)+,
                 RefSect3*
               ) |
               RefSect3+
             )
           )

RefSect3 = ( RefSect3Info?,
             ( Title, Subtitle?, TitleAbbrev? ),
             (%refcomponent.mix;)+
           )

Elements : RefSect1, RefSect1Info, Title, Subtitle, TitleAbbrev, RefSect2, RefSect2Info, RefSect3, RefSect3Info.