code: public static String selectString(Node node, String xpath, String defaultValue) {
          return selector.selectString(node, xpath, defaultValue);
      }
docs: <p>Extract the given value from the node as a String or if the value cannot
  be extracted, {@code defaultValue} is returned.
  </p><p>
  Example: To get the value of the attribute "foo" in the node, specify
  "@foo" as the path.
  </p>
  Note: This method does not handle namespaces explicitely.
  
  @param node         the node with the wanted attribute
  @param xpath        the XPath to extract.
  @param defaultValue the default value
  @return the value of the path, if existing, else
  {@code defaultValue}