Here is a modified version of the code that you posted that should explain it.
<?php
$xmlData = <<<XMLDATA
<?xml version="1.0" encoding="ISO-8859-1" ?>
<root>
<subElement>content</subElement>
</root>
XMLDATA;
$dom = new DomDocument;
$dom->loadXML( $xmlData );
$dom2 = new DomDocument;
$fragment = $dom2->createDocumentFragment();
foreach( $dom->childNodes AS $node ) {
$newNode = $dom2->importNode( $node, true );
/** This is the (undocumented?) way to get the value of a text node */
var_dump($newNode->nodeValue);
$fragment->appendChild( $newNode );
/** Now we see what the value of the $fragment is */
var_dump($fragment);
}
$dom2->appendChild( $fragment );
/** Finally, we echo the XML of the new document */
echo $dom2->saveXML();
?>
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