org.danielnixon.saferdom.implicits.lib
https://wiki.whatwg.org/wiki/DOM_XPath
https://www.w3.org/TR/DOM-Level-3-XPath/xpath.html#XPathResult
https://wiki.whatwg.org/wiki/DOM_XPath
https://www.w3.org/TR/DOM-Level-3-XPath/xpath.html#XPathResult