[Planner Dev] XSLT wizard needed for mpp2planner translation

Hi,

I'm working on an mpp importer for Planner. One problem I'm having now
is the dumb exporter would give a flat list of tasks like this

<task id="1" outline="0"/>
<task id="4" outline="0"/>
<task id="2" outline="1"/>
<task id="3" outline="2"/>
...

Tasks must be sorted first by id attribute. Outline attribute then
will determine the task hierarchy. The final result should be

<task id="1" outline="0">
  <task id="2" outline="1">
    <task id="3" outline="2"/>
  </task>
</task>
<task id="4" outline="0"/>

Anyone know how to make a hierarchy from such flat list? I looked at
msp2planner.xsl but it requires on WBS strings, which are not
available in MPP9.

Regards,
-- 
Duy