1  0 10 doc 0 0
2  0 1 doc 0 0
3  1 1 a 0 0
4  2 3 #text 0 1 This
5  1 15 a 0 0
6  1 1 b 0 0
7  2 3 #text 0 1  is a valid document
8  1 15 b 0 0
9  0 15 doc 0 0