nodes having same values in same order

Hello,

If I have a structure like the following -

<xxx>
  <pp></pp>
  <qq></qq>
  <rr></rr>
</xxx>
<xxx>
  <pp></pp>
  <qq></qq>
</xxx>

<yyy>
  <pp></pp>
  <qq></qq>
</yyy>
<yyy>
  <pp></pp>
  <qq></qq>
  <rr></rr>
</yyy>

How do I find out the yyy elements that have exactly
the same elements(same order and count) as in xxx?

Thanks


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