[ Tree (Cell 1:1 1:6 NodePara) 
    [ Tree (Cell 1:1 1:6 (NodeToken (TokenText "text1"))) []
    ] 
, Tree (Cell 2:1 2:7 (NodeHeader (HeaderSection 1))) 
    [ Tree (Cell 2:3 2:7 NodePara) 
        [ Tree (Cell 2:3 2:7 (NodeToken (TokenText "sec1"))) []
        ] 
    ] 
]