0 => xpath 1 => registerXPathNamespace 2 => asXML 3 => saveXML 4 => getNamespaces 5 => getDocNamespaces 6 => children 7 => attributes 8 => __construct 9 => addChild 10 => addAttribute 11 => getName 12 => __toString 13 => count 14 => rewind 15 => valid 16 => current 17 => key 18 => next 19 => hasChildren 20 => getChildren