Use XSLT to transform a child node but leave the rest intact

Question

I have a XML where I only want to modify a specific section, and leave the rest intact, how can this be done? i.e I only want to modify the node AA2

<root>
  <parentHeader>
  </parentHeader>
  <body>
    <ChildAA>
      <AA1>
        <foo>bar</foo>
        <foo>bar2</foo>    
      </AA1>
      <AA2>
        <foo>bar</foo>
        <foo>bar2</foo>    
      </AA2>
     </ChildAA>
     <ChildBB>
      <BB1>
       <foo>bar</foo>
       <foo>bar2</foo>
      </BB1> 
      <BB2>
       <foo>bar</foo>
       <foo>bar2</foo>
      </BB2>   
     </ChildBB>
   </body>
</root>

I have the following XSLT which only returns the modified section. How can I include everything else?

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
     <xsl:output omit-xml-declaration="yes" indent="yes"/>
     <xsl:strip-space elements="*"/>

      <!-- Whenever you match any node or any attribute -->
      <xsl:template match="/*"> 
           <xsl:apply-templates/>  
      </xsl:template>


    <xsl:template match="AA2">
       <RenamedAA2>    
         <xsl:copy-of select="."/>
      </RenamedAA2>
    </xsl:template>    
    <xsl:template match="text()"/>

</xsl:stylesheet>

I am looking for something like this as result

<root>
  <parentHeader>
  </parentHeader>
  <body>
    <ChildAA>
      <AA1>
        <foo>bar</foo>
        <foo>bar2</foo>    
      </AA1>
     <RenamedAA2>
        <foo>bar</foo>
      </RenamedAA2>
      <RenamedAA2>
        <foo>bar2</foo>    
      </RenamedAA2>
     </ChildAA>
     <ChildBB>
      <BB1>
       <foo>bar</foo>
       <foo>bar2</foo>
      </BB1> 
      <BB2>
       <foo>bar</foo>
       <foo>bar2</foo>
      </BB2>   
     </ChildBB>
   </body>
</root>

Daniel Haley · Accepted Answer · 2012-06-04 02:41:58Z

What you want is the identity transform.

Your template that has the comment Whenever you match any node or any attribute isn't doing what you think. It's only matching the root element.

Also, you're stripping all text() nodes with that last template.

Here's an example of what you should do:

XSLT 1.0

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output indent="yes"/>
    <xsl:strip-space elements="*"/>

    <!--Identity Transform.-->
    <xsl:template match="node()|@*">
        <xsl:copy>
            <xsl:apply-templates select="node()|@*"/>
        </xsl:copy>
    </xsl:template>

    <xsl:template match="AA2/foo">
        <RenamedAA2>
            <xsl:copy>
                <xsl:apply-templates select="node()|@*"/>
            </xsl:copy>
        </RenamedAA2>
    </xsl:template>

    <xsl:template match="AA2">
        <xsl:apply-templates/>
    </xsl:template>

</xsl:stylesheet>

XML Output

<root>
   <parentHeader/>
   <body>
      <ChildAA>
         <AA1>
            <foo>bar</foo>
            <foo>bar2</foo>
         </AA1>
         <RenamedAA2>
            <foo>bar</foo>
         </RenamedAA2>
         <RenamedAA2>
            <foo>bar2</foo>
         </RenamedAA2>
      </ChildAA>
      <ChildBB>
         <BB1>
            <foo>bar</foo>
            <foo>bar2</foo>
         </BB1>
         <BB2>
            <foo>bar</foo>
            <foo>bar2</foo>
         </BB2>
      </ChildBB>
   </body>
</root>

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