Lookup question -- attempt 3

[Mir Farooq Ali <miali@xxxxxxxxx>]

I'm trying again to seek your help. This problem has been irking me for 
a couple of days now and I'm at my wit's end trying to solve it. I have 
significantly simplified my input and lookup files, so I'll appreciate 
it greatly if somebody can take a look  and help me.

I have the following input file, where the pref element indicates a 
lookup field from a different file.

<?xml version="1.0" encoding="utf-8" ?>
<TM>
  <T id="id1">
    <pref>1</pref>
      <T id="id2">
        <pref>1</pref>
          <T id="id3">
            <pref>3</pref>
          </T>
      </T>
  </T>
</TM>

The lookup file is as follows.

<?xml version="1.0" ?>
<AB>
  <pa prefnum="1">
    <XXXX>
      <YYYY />
      <ZZZZ />
    </XXXX>
  </pa>
  <pa prefnum="2">
    <WWWW />
  </pa>
  <pa prefnum="3">
    <AAAA>
      <BBBB />
      <CCCC />
      <DDDD>
        <EEEE />
        <FFFF />
      </DDDD>
    </AAAA>
  </pa>
</AB>

Each T element in the original file has to be replaced by a set of p 
elements whose attributes are set based on the lookup performed and the 
id from the original file.
So the first T element with id = id1 and pref = 1 should be replaced by 
the following

  <p c="XXXX" id="id11">
    <p c="YYYY" id="id112" />
    <p c="ZZZZ" id="id114" />
  </p>

I am able to do the lookup successfully, but am unable to maintain the 
hierarchy of the source tree. This is my stylesheet

 <?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
  <xsl:output indent="yes" />

  <xsl:template match="/">
    <Root>
      <xsl:apply-templates />
    </Root>
  </xsl:template>

  <xsl:template match="//T">
    <xsl:apply-templates 
select="document('lookup.xml')//AB/pa[@prefnum=current()/pref]/*" mode="p">
      <xsl:with-param name="id" select="@id" />
    </xsl:apply-templates>
    <xsl:apply-templates select="*" />
  </xsl:template>

  <xsl:template match="pref"></xsl:template>

  <xsl:template mode="p" match="*">
    <xsl:param name="id">IDENTIFIER</xsl:param>
    <xsl:variable name="idd" select="translate($id,' 
','_')"></xsl:variable>
    <xsl:variable name="newid" select="concat($idd, 
position())"></xsl:variable>
    <p c="{name()}" id="{$newid}">
      <xsl:apply-templates mode="p">
        <xsl:with-param name="id" select="$newid" />
      </xsl:apply-templates>
    </p>
    <xsl:apply-templates />
  </xsl:template>
</xsl:stylesheet>

Based on this, I'm getting the following output.

<?xml version="1.0" encoding="UTF-8" ?>
<Root>
  <p c="XXXX" id="id11">
    <p c="YYYY" id="id112" />
    <p c="ZZZZ" id="id114" />
  </p>
  <p c="XXXX" id="id21">
    <p c="YYYY" id="id212" />
    <p c="ZZZZ" id="id214" />
  </p>
  <p c="AAAA" id="id31">
    <p c="BBBB" id="id312" />
    <p c="CCCC" id="id314" />
    <p c="DDDD" id="id316">
      <p c="EEEE" id="id3162" />
      <p c="FFFF" id="id3164" />
    </p>
  </p>
</Root>

The correct output that I desire is

<?xml version="1.0" encoding="UTF-8" ?>
<Root>
  <p c="XXXX" id="id11">
    <p c="YYYY" id="id112" />
    <p c="ZZZZ" id="id114" />

    <p c="XXXX" id="id21">
      <p c="YYYY" id="id212" />
      <p c="ZZZZ" id="id214" />

      <p c="AAAA" id="id31">
        <p c="BBBB" id="id312" />
        <p c="CCCC" id="id314" />
        <p c="DDDD" id="id316">
           <p c="EEEE" id="id3162" />
           <p c="FFFF" id="id3164" />
        </p>
      </p>
    </p>
  </p>
</Root>

If I move the <xsl:apply-templates select="*" /> command from the T 
template and move it within the mode=p template, then it works for only 
the first T element. I'm assuming this is because the context has 
switched to the lookup file and at that point, it's unable to find any 
more T elements there. So how do I restore the context back to the 
original file *at that point*?

Please help!

Thanks,

-Farooq.
--
Mir Farooq Ali

Computer Science, Virginia Tech,
Email: miali@xxxxxxxxx
Web: http://purl.org/net/farooq
Office: 525 McBryde Hall
Tel: (540) 231-1927 (Office)
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(c) 2004 Mir Farooq Ali  All rights reserved
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