code: public static String asString(String expression, Node node)
              throws XPathExpressionException {
          return evaluateAsString(expression, node, xpath());
      }
docs: Evaluates the specified XPath expression and returns the result as a
  string.
  <p>
  This method can be expensive as a new xpath is instantiated per
  invocation. Consider passing in the xpath explicitly via {
  {@link #asDouble(String, Node, XPath)} instead.  Note {@link XPath} is
  not thread-safe and not reentrant.
  
  @param expression
  The XPath expression to evaluate.
  @param node
  The node to run the expression on.
  
  @return The string result.
  
  @throws XPathExpressionException
  If there was a problem processing the specified XPath
  expression.