PortableInfobox/services/Parser/Nodes/NodeHeader.php

<?php
namespace Wikia\PortableInfobox\Parser\Nodes;

class NodeHeader extends Node {

	public function getData() {
		return [ 'value' => $this->getExternalParser()->parseRecursive(
			\Wikia\PortableInfobox\Helpers\SimpleXmlUtil::getInstance()->getInnerXML( $this->xmlNode )
		) ];
	}
}