hierarchical sorting problem

I am trying to sort an XML document by a variety of different attributes.
Here is an example of the source document:

<Result>
  <Product MaterialNumber="494728" Team="ENJ" ActionCode="C1" />
  <Group MaterialNumber="376050" Team="RMT">
    <Product MaterialNumber="376050" Team="RMT" ActionCode="A1" />
    <Product MaterialNumber="376009" Team="RMT" ActionCode="D4" />
  </Group>
  <Product MaterialNumber="70133" ActionCode="" />
  <Group MaterialNumber="75050" Team="RKL">
    <Product MaterialNumber="75050" Team="RKL" ActionCode="J0" />
    <Product MaterialNumber="76009" Team="RKL" ActionCode="A0" />
  </Group>
  <Product MaterialNumber="70309" Team="DDE" ActionCode="A5" />
  <Group MaterialNumber="75051" Team="RKP">
    <Product MaterialNumber="75051" Team="RKP" ActionCode="J1" />
    <Product MaterialNumber="76109" Team="RKP" ActionCode="A4" />
  </Group>
</Result>

I need to sort by the Product ActionCode attribute at either level to
produce the following output:

<Result>
  <Product MaterialNumber="70133" ActionCode="" />
  <Group MaterialNumber="75050" Team="RKL">
    <Product MaterialNumber="76009" Team="RKL" ActionCode="A0" />
    <Product MaterialNumber="75050" Team="RKL" ActionCode="J0" />
  </Group>
  <Group MaterialNumber="376050" Team="RMT">
    <Product MaterialNumber="376050" Team="RMT" ActionCode="A1" />
    <Product MaterialNumber="376009" Team="RMT" ActionCode="D4" />
  </Group>
  <Group MaterialNumber="75051" Team="RKP">
    <Product MaterialNumber="76109" Team="RKP" ActionCode="A4" />
    <Product MaterialNumber="75051" Team="RKP" ActionCode="J1" />
  </Group>
  <Product MaterialNumber="70309" Team="DDE" ActionCode="A5" />
  <Product MaterialNumber="494728" Team="ENJ" ActionCode="C1" />
</Result>

I also need to sort by the Product|Group MaterialNumber attribute to
produce the following output:

<Result>
  <Product MaterialNumber="70133" ActionCode="" />
  <Product MaterialNumber="70309" Team="DDE" ActionCode="A5" />
  <Group MaterialNumber="75050" Team="RKL">
    <Product MaterialNumber="75050" Team="RKL" ActionCode="J0" />
    <Product MaterialNumber="76009" Team="RKL" ActionCode="A0" />
  </Group>
  <Group MaterialNumber="75051" Team="RKP">
    <Product MaterialNumber="75051" Team="RKP" ActionCode="J1" />
    <Product MaterialNumber="76109" Team="RKP" ActionCode="A4" />
  </Group>
  <Group MaterialNumber="376050" Team="RMT">
    <Product MaterialNumber="376009" Team="RMT" ActionCode="D4" />
    <Product MaterialNumber="376050" Team="RMT" ActionCode="A1" />
  </Group>
  <Product MaterialNumber="494728" Team="ENJ" ActionCode="C1" />
</Result>

Note: The example I have shown only has two children per group.  The live
data for this document can have an unlimited number of children.

TIA,
Andy

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