nesting flat XML based on attribute value.

Hello,

 I'm not sure whether I'm being dumb or not here but I'm stuck on converting a 
flat structure to a nested structure.

the flat structure is like this:-

<?xml version="1.0 " encoding="US-ASCII"?>
<doc>
  <ch id="1o1">
    <sec id="sec1o1o1" fpage="3" lpage="5" />
    <sec id="sec1o1o1o1" fpage="3" lpage="3"/>
    <sec id="sec1o1o1o2" fpage="3" lpage="4"/>
    <sec id="sec1o1o1o3" fpage="4" lpage="4"/>
    <sec id="sec1o1o1o4" fpage="4" lpage="5"/>
    <sec id="sec1o1o1o5" fpage="5" lpage="5"/>
    <sec id="sec1o1o2" fpage="5" lpage="7"/>
    <sec id="sec1o1o2o1" fpage="5" lpage="5"/>
    <sec id="sec1o1o2o2" fpage="5" lpage="5"/>
    <sec id="sec1o1o2o3" fpage="5" lpage="6"/>
    <sec id="sec1o1o2o4" fpage="6" lpage="7"/>
    <sec id="sec1o1o2o4o1" fpage="6" lpage="6"/>
    <sec id="sec1o1o2o4o2" fpage="6" lpage="6"/>
    <sec id="sec1o1o2o4o3" fpage="6" lpage="7"/>
    <sec id="sec1o1o3" fpage="7" lpage="10"/>
    <sec id="sec1o1o3o1" fpage="7" lpage="7"/>
    <sec id="sec1o1o3o1o1" fpage="7" lpage="7"/>
  </ch>
</doc>

I would like to get to

<?xml version="1.0" encoding="US-ASCII"?>
<doc>
  <ch id="1o1">
    <sec id="sec1o1o1" fpage="3" lpage="5">
      <sec id="sec1o1o1o1" fpage="3" lpage="3"/>
      <sec id="sec1o1o1o2" fpage="3" lpage="4"/>
      <sec id="sec1o1o1o3" fpage="4" lpage="4"/>
      <sec id="sec1o1o1o4" fpage="4" lpage="5"/>
      <sec id="sec1o1o1o5" fpage="5" lpage="5"/>
    </sec>
    <sec id="sec1o1o2" fpage="5" lpage="7">
      <sec id="sec1o1o2o1" fpage="5" lpage="5"/>
      <sec id="sec1o1o2o2" fpage="5" lpage="5"/>
      <sec id="sec1o1o2o3" fpage="5" lpage="6"/>
      <sec id="sec1o1o2o4" fpage="6" lpage="7">
        <sec id="sec1o1o2o4o1" fpage="6" lpage="6"/>
        <sec id="sec1o1o2o4o2" fpage="6" lpage="6"/>
        <sec id="sec1o1o2o4o3" fpage="6" lpage="7"/>
      </sec>
    </sec>
    <sec id="sec1o1o3" fpage="7" lpage="10">
      <sec id="sec1o1o3o1" fpage="7" lpage="7">
        <sec id="sec1o1o3o1o1" fpage="7" lpage="7"/>
      </sec>
    </sec>
  </ch>
</doc>

i.e.  both the nesting "level" and "order" are in the id attribute.

any tips appreciated.

 Dave.

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