code: public static Object toUUId(Object o) throws PageException {
  	String str = toString(o);
  	if (!Decision.isUUId(str)) throw new ExpressionException("can't cast [" + str + "] to uuid value");
  	return str;
      }
docs: cast a Object to a UUID
  
  @param o Object to cast
  @return casted Query Object
  @throws PageException