XML, XSLT and XPATH

Adding New Element using XSLT

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Join Date: Jan 2009

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Adding New Element using XSLT

Jan 12th, 2009

Hi All,
I have a set of elements to be added to an existing XML document. I would like to write a XSLT tranformation for this. My requirement is that I need to check whether the element is already there in the XML file. Only if its non existent, I need to add that element. I have to repeat this step for a set of elements. Also, my XML file is namespace based.

Please advise.

Regards
Ramesh

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Join Date: Oct 2008

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fpmurphy

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Re: Adding New Element using XSLT

Jan 12th, 2009

Here is a simple example of adding an element. Suppose you have the folllowing XML document

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<root>
   <list>
      <a>aaaa</a>
      <b>bbbb</b>
   </list>
</root>
<root>
   <list>
      <a>aaaa</a>
      <b>bbbb</b>
   </list>
</root>

and you want to add an extra element <c>. The following stylesheet is one way of adding this element.

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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0" >
  <xsl:param name="ename">c</xsl:param>
  <xsl:param name="evalue">cccc</xsl:param>
 
  <xsl:output method="xml" encoding="utf-8"/>
 
  <xsl:template match="@*|node()">
     <xsl:copy>
       <xsl:apply-templates select="@*|node()" />
     </xsl:copy>
  </xsl:template>
 
  <xsl:template match="list">
     <xsl:copy>
         <xsl:apply-templates/>
          <xsl:if test="not(c)">
             <xsl:element name="{$ename}"><xsl:value-of select="$evalue"/></xsl:element>
          </xsl:if>
     </xsl:copy>
  </xsl:template>
 
</xsl:stylesheet>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0" >
  <xsl:param name="ename">c</xsl:param>
  <xsl:param name="evalue">cccc</xsl:param>

  <xsl:output method="xml" encoding="utf-8"/>

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

  <xsl:template match="list">
     <xsl:copy>
         <xsl:apply-templates/>
          <xsl:if test="not(c)">
             <xsl:element name="{$ename}"><xsl:value-of select="$evalue"/></xsl:element>
          </xsl:if>
     </xsl:copy>
  </xsl:template>

</xsl:stylesheet>

The output is

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<root>
      <list>
      <a>aaaa</a>
      <b>bbbb</b>
   <c>cccc</c></list>
</root>
<root>
      <list>
      <a>aaaa</a>
      <b>bbbb</b>
   <c>cccc</c></list>
</root>

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Join Date: Jan 2009

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Re: Adding New Element using XSLT

Jan 15th, 2009

Thanks for the help. I was trying the same thing with my examples. But it looks like only the identity transformation template is only invoked. The other template is not invoked. There is a namespace associated with the XML file. ( The schema that defines the XML has the targetnamespace). Is this why the other templates are not invoked? How to handle namespace based insertion.

Thanks