<orcontainer>
  <empty1 attr1="N0"/>
  <empty1 attr1="N1"
                  attr2="some">
          <sub-empty/>
  </empty1>
  <empty1 attr1="N2"/>
<caret><selection>    <empty1 attr1="N4"/></selection>
    <empty1 attr1="N3"
     attr2="some"/>
</orcontainer>