Correlation between two xml trees

I'm sorry I can't come up with a short description of what I want to
do. Instead, here is an example.

I have an exported recordset (henceforth known as tabledef) that looks like this:

  <xml xmlns:rs='urn:schemas-microsoft-com:rowset' xmlns:z='#RowsetSchema'>
    <rs:data>
      <z:row col1='1' col2='a' col3='x' />
      <z:row col1='2' col2='b' col3='y' />
      <z:row col1='3' col2='c' col3='z' />
    </rs:data>
  </xml>

and another xml document (outputdef) that looks like this:

  <root>
    <column tagname="tag1" dbcolumn="col1"/>
    <column tagname="tag2" dbcolumn="col2"/>
  </root>

I want to output this:

  <root>
    <data>
      <tag1>1</tag1>
      <tag2>a</tag2>
    </data>
    <data>
      <tag1>2</tag1>
      <tag2>b</tag2>
    </data>
    <data>
      <tag1>3</tag1>
      <tag2>c</tag2>
    </data>
  </root>

In other words, I want to output a "data" element for each row in
tabledef and I want to use the element values from tabledef, but I
want to output only the elements defined with "dbcolumn" attributes in
outputdef and I want to use the element names from outputdef.

I've got the structure correct, but no values. Like this:

  <root>
    <data>
      <tag1></tag1>
      <tag2></tag2>
    </data>
    <data>
      <tag1></tag1>
      <tag2></tag2>
    </data>
    <data>
      <tag1></tag1>
      <tag2></tag2>
    </data>
  </root>

I'm using MSXML4. Here is my XSLT (I'm transforming the tabledef; the
outputdef is being passed in as a DOMDocument parameter):

  <?xml version="1.0"?>
  <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                  xmlns:rs='urn:schemas-microsoft-com:rowset'
                  xmlns:z='#RowsetSchema'
                  version="1.0">
    <xsl:output method="xml" indent="yes" />
    <xsl:param name="outputdef" />
    <xsl:template match="/">
      <root>
        <xsl:apply-templates select="/xml/rs:data/z:row"/>
      </root>
    </xsl:template>
    <xsl:template match="z:row">
      <data>
        <xsl:for-each select="$outputdef/root/column">
          <xsl:element name="{@tagname}">
            --------> SOME MAGIC HAPPENS HERE <----------
          </xsl:element>
        </xsl:for-each>
      </data>
    </xsl:template>
  </xsl:stylesheet> 

How do I get the value from the outer z:row context that corresponds
to the dbcolumn attribute for the current $outputdef/root/column?

Thanks,
John



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