code: public final String getStringDefault(String defaultValue, String attribute, String... path)
      {
          return getNodeStringDefault(defaultValue, attribute, path);
      }
docs: Get a string in the xml tree.
  
  @param defaultValue Value used if node does not exist.
  @param attribute The attribute to get as string.
  @param path The node path (child list)
  @return The string value.
  @throws LionEngineException If unable to read node.