[ Tree (Cell 1:1 2:6 (NodeHeader (HeaderSection 1))) 
    [ Tree (Cell 1:3 1:7 NodePara) 
        [ Tree (Cell 1:3 1:7 (NodeToken (TokenText "sec1"))) []
        ] 
    , Tree (Cell 2:1 2:6 NodePara) 
        [ Tree (Cell 2:1 2:6 (NodeToken (TokenText "text1"))) []
        ] 
    ] 
, Tree (Cell 3:1 4:6 (NodeHeader (HeaderSection 1))) 
    [ Tree (Cell 3:3 3:8 NodePara) 
        [ Tree (Cell 3:3 3:8 (NodeToken (TokenText "sec11"))) []
        ] 
    , Tree (Cell 4:1 4:6 NodePara) 
        [ Tree (Cell 4:1 4:6 (NodeToken (TokenText "text2"))) []
        ] 
    ] 
, Tree (Cell 5:1 5:7 (NodeHeader (HeaderSection 1))) 
    [ Tree (Cell 5:3 5:7 NodePara) 
        [ Tree (Cell 5:3 5:7 (NodeToken (TokenText "sec2"))) []
        ] 
    ] 
]