<t->, <lt>, <mt>,
<tt>, <ls>,
<hasspace>, <hasicon>,
<haslabel>, <haslink>,
<hasmessage>
and <hastip>
<diputree> <has>
<l>
This leaf is a top level leaf in diputree.
<b> <has>
<l>
This leaf is a contained in this branch.
<diputree> <hasdefaulttemplate>
<l>
This leaf will be the default leaf
template within diputree.
<diputree> <hastemplate>
<l>
This leaf will be a leaf template. Other leafs
can refer to this template with the <t->
relation.
<l> was chosen over <leaf> because of its terseness.