1<?xml version="1.0" encoding="UTF-8"?>
2<out>id0, id0
3id1, id1
4id2, id2
5id3, id3
6id4, id4
7id5, id5
8id6, id6
9id7, id7
10
11== apply above, call below ==
12id0, id0
13id1, id1
14id2, id2
15id3, id3
16id4, id4
17id5, id5
18id6, id6
19id7, id7
20</out>