I have a document like:

<all>
  <phone>
    <number>12345</number>
    <r comp="1"/>
    <r comp="2"/>
    <r comp="3"/>
    <r comp="1">
      <r address="a"/>
    </r>
    <r comp="2">
      <r address="b"/>
    </r>
    <r comp="3">
      <r address="c"/>
    </r>
    <r comp="1">
      <r country="a1"/>
    </r>
    <r comp="2">
      <r country="b1"/>
    </r>
    <r comp="3">
      <r country="c1"/>
    </r>
  </phone>
  <phone>
    <number>67890</phone>
    <r comp="1"/>
    <r comp="1">
      <r address="a"/>
    </r>
    <r comp="1">
      <r country="a1"/>
    </r>
  </phone>
</all>

That I would like to use XSLT to transform to:

<all>
  <phone>
    <number>12345</number>
    <r comp="1">
      <r address="a"/>
      <r country="a1"/>
    </r>
    <r comp="2">
      <r address="b"/>
      <r country="b1"/>
    </r>
    <r comp="3">
      <r address="c"/>
      <r country="c1"/>
    </r>
  </phone>
  <phone>
    <number>67890</phone>
    <r comp="1">
      <r address="a"/>
      <r country="a1"/>
    </r>
  </phone>
</all>

So I need to do grouping.  I've used the key and generate-id trick to
do:

<xsl:key name="rs" match="r" use="@comp">

then:

<xsl:for-each select="r[generate-id(.)=generate-id(key('rs',
@comp)[1])]">

to select the r elements and then process them to get the correct
output.  Using this method I can get the first phone element to output
correctly, but when it gets to the second one (or any other one that
has an r element with a comp attribute that has already been processed,
the select in the for-each statement doesn't select anything (comp="1"
was already processed in the previous phone element), so I get no
output.  Does anyone have any ideas on how to get this to work or
another way to do it?

Thanks.