Renaming a DOM element with XSL

When playing with the PHP classes for DOM manipulation I found out that there isn't a method to rename an element in the DOM, well, also someone else came across this thing.

I wonder why they don't allow renaming a DOM element, but anyhow you can always use XSL to do this kind of manipulations, let's see how:

<?php

// The document to transform
$xml = <<<'EOM'
<?xml version="1.0"?>
<root>
  <old>
  Text
  </old>
</root>
EOM;

$xmlDoc = new DOMDocument();
$xmlDoc->loadXML($xml);

// The stylesheet which renames the <old></old> element into <new></new>
$stylesheet = <<<'EOM'
<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="xml" indent="yes" />

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

<xsl:template match="old">
  <xsl:element name="new">
    <!-- the select below makes sure the attributes are preserved too -->
    <xsl:apply-templates select="@*|node()" />
  </xsl:element>
</xsl:template>

</xsl:stylesheet>
EOM;

$xsl = new DOMDocument;
$xsl->loadXML($stylesheet);

$xp = new XSLTProcessor();
$xp->importStylesheet($xsl);

// transform the XML using the stylesheet
$output = $xp->transformToXML($xmlDoc);
if (FALSE === $output)
    trigger_error('XSL transformation failed.', E_USER_ERROR);

echo '<pre>' . htmlspecialchars($xml) . '</pre>';
echo '<pre>' . htmlspecialchars($output) . '</pre>';

This and other useful notes about XML and XSL can be found in this old but still good article.


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