Merge two XML files

I have 2 XML files that I want to be able to merge them together given a 
list of keys.  I have searched the group but the examples are slightly 
different than ours.  Our XML files have the following format:
XML1.xml

<Document>
 <row>
   <column name="FirstName">Smith</column>
   <column name="LastName">John</column>
   <column name="Address">7777 First </column>
 </row>
 <row>
   <column name="FirstName">Smith2</column>
   <column name="LastName">John2</column>
   <column name="Address">7777 Second </column>
 </row>
...
</Document>

XML2.xml
<Document>
 <row>
   <column name="FirstName">Smith</column>
   <column name="LastName">John</column>
   <column name="Age">36</column>
 </row>
 <row>
   <column name="FirstName">Smith2</column>
   <column name="LastName">John2</column>
   <column name="Age">40</column>
 </row>
...
</Document>

The result XML should be:
<Document>
 <row>
   <column name="FirstName">Smith</column>
   <column name="LastName">John</column>
   <column name="Address">7777 First </column>
   <column name="Age">36</column>
 </row>
 <row>
   <column name="FirstName">Smith2</column>
   <column name="LastName">John2</column>
   <column name="Address">7777 Second </column>
   <column name="Age">40</column>
 </row>
...
</Document>

Here is my first attempt of writing the XSL file.  For simplification, I 
just tried to merge them based on the "FirstName" column.  However, I don't 
know how to specify the key to search in the second file.

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
 version="1.0" xmlns:xalan="http://xml.apache.org/xalan";>

<xsl:output method="xml" indent="yes"/>

<xsl:param name="source" select="c:/temp/kmtable2.xml"/>    <!--source of 
data-->
<xsl:key name="row" match="$source/Document/row" 
use="column[(_at_)name='FirstName']"/>
<xsl:template match="/">        <!--document element-->
  <Document>
     <xsl:for-each select="Document/row">
       <xsl:copy-of select="."/>
       <xsl:variable name="name" select="column[(_at_)name='FirstName']"/>
       <xsl:for-each select="document($source)/Document/row">
         <xsl:apply-templates select="key('row', $name)"/>
       </xsl:for-each> -->
     </xsl:for-each>
  </Document>
</xsl:template>

<xsl:template match="row">
 <xsl:copy-of select="."/>
</xsl:template>

</xsl:stylesheet>

It kept complaining about "A node test that matches either NCName:* or QName 
was expected.".  It looks like it doesn't like the match claus in <xsl:key>.

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