code: public static <T extends Command> T  fromXml(String commandXml) {
          return (T) X_STREAM.fromXML(commandXml);
      }
docs: Method used by framework to de-serialize a command from XML.
  
  @param commandXml XML representation of a command.
  
  @return new instance of a command initialized with data from <code>commandXml</code>  argument.