code: Element evaluateXPathNode(Node contextNode, String expression, Object... args) {
  		return evaluateXPathNodeNS(contextNode, null, expression, args);
  	}
docs: Evaluate XPath expression expecting a single result node.
  
  @param contextNode evaluation context node,
  @param expression XPath expression, formatting tags supported,
  @param args optional formatting arguments.
  @return evaluation result as element, possible null.