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htmlpurifier/configdoc/library/ConfigDoc/XMLSerializer.php

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<?php
/**
* The XMLSerializer hierarchy of classes consist of classes that take
* objects and serialize them into XML, specifically DOM, form; this
* super-class contains convenience functions for those classes.
*/
class ConfigDoc_XMLSerializer
{
/**
* Appends a div containing HTML into a node
* @param $document Base document node belongs to
* @param $node Node to append to
* @param $html HTML to place inside div to append
* @todo Place this directly in DOMNode, using registerNodeClass to
* override.
*/
protected function appendHTMLDiv($document, $node, $html) {
$purifier = HTMLPurifier::getInstance();
$html = $purifier->purify($html);
$dom_html = $document->createDocumentFragment();
$dom_html->appendXML($html);
$dom_div = $document->createElement('div');
$dom_div->setAttribute('xmlns', 'http://www.w3.org/1999/xhtml');
$dom_div->appendChild($dom_html);
$node->appendChild($dom_div);
}
}