A more complicated Muenchian Method exercise

In this last week and a half, I have been on a serious learning curve, and
this list has helped me a lot.  Thanks.
Now I need some more.  :)

I have the following (abbreviated) XML Structure

<report>

<header>
<date></date>
<sender>
<sen_id></sen_id>
<recipient>
  <rec_id></rec_id>
  <detail></detail>
  <detail></detail>
</recipient>
</sender>
</header>

<header>
<date></date>
<sender>
<sen_id></sen_id>
<recipient>
  <rec_id></rec_id>
  <detail></detail>
  <detail></detail>
  <detail></detail>
</recipient>
</sender>
</header>

...

</report>


I would like to make a report based on the above XML that has a primary
grouping by "date", which is no problem.
What I'm not sure about is how to do a second grouping on the UNIONED SET of
senders and recipients.  That is, I have a set called "Trading Partner", of
which "sender" and "recipients" are members.  That way I can then produce an
output that groups on TP's, and then I could output the documents that were
received, and then sent for a particular "Trading Partner".  Like the
following:

REPORT
  DATE1
    TRADING PARTNER: "name1"
        DOCUMENTS SENT
        DOCUMENTS REC'D
    TRADING PARTNER: "name2"
        DOCUMENTS SENT
        DOCUMENTS REC'D
  DATE2 ...

I tried adapting the familiar syntax:
key('key2_name', concat(key1, ' ', key2))
to
key('key2_name', concat(arrive_date, ' ', sender/sen_id |
sender/recipient/rec_id) )

but the conversion of the OR'd set to a string does not work.  It seems to
ignore the rec_id, and I only get the sender set.
I could re-organise my XML, I suppose, but I'd rather not, since I've
already built a couple XSL docs based on the above (which comes from SQL
Server's XML AUTO, ELEMENTS dump).  And I'd like to see how to achieve this
anyways.

----------
Below is an exerpt of the actual XSL (sen_id and rec_id are tpid here, and
DTSEnvelopes = header, and arrived = date).  This seems to output a line for
each sender/tpid but not Sender/Recipient/tpid

<xsl:key name="DTSEnvelopes-by-arrived" match="DTSEnvelopes"
use="substring-before(arrived, 'T')" />
<xsl:key name="DTSEnvelopes-by-arrived-tp" match="DTSEnvelopes"
use="concat(substring-before(arrived, 'T'), ' ', Sender/tpid |
Sender/Recipient/tpid)" />

<xsl:for-each select="DTSEnvelopes[count(. |
key('DTSEnvelopes-by-arrived-tp',concat(substring-before(arrived, 'T'), ' ',
Sender/tpid | Sender/Recipient/tpid) )[1]) = 1]" >
  <xsl:sort select="substring-before(arrived, 'T')" order="ascending" />
  <h1><xsl:value-of select="concat(substring-before(arrived, 'T'), ' ',
Sender/tpid | Sender/Recipient/tpid)" /><br/>  <!-- This line only gives
"arrived sender/tpid", no "arrived sender/recipient/tpid" -->
         <xsl:value-of select="Sender/tpid"/><br />
         <xsl:value-of select="Sender/Recipient/tpid" />
  </h1>
</xsl:for-each>
-----------------


Thanks,

Greg


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