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<?php $document = new DOMDocument(); $document->loadXML('<foo />'); $xpath = new DOMXPath($document); $xpath->registerNamespace('sig', 'http://www.w3.org/2000/09/xmldsig#'); $node = $xpath->query('//*[not(sig:SignatureValue)]'); var_dump($node); var_dump($document->saveXML());

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