1<btable "2019:06:rehersal">
2<opt>showempty,colongroups</opt>
3  <columns>
45.
512.
619.
726.
8  </columns>
9  <rows>
10Singer: one
11Singer: two
12Singer: three
13Band: Guitar 1
14Band: Guitar 2
15Band: Drums
16Band: Keys
17Band: Bass
18  </rows>
19</btable>
20