<diputree>
<has>
<b>
<lt>level 1</lt>
<has>
<b>
<lt>level 2</lt>
<has>
<b/>
</has>
</b>
</has>
</b>
</has>
</diputree>
<diputree>
<has>
a <b>
ranch with a <lt>
(label text) level 1
which itself <has>
a <b>
with <lt>
level 2
which itself <has>
an empty <b/>
with no label.
<b> (branch), <l> (leaf) and <diputree>