Adding const modifier to a variable declaration will protect it from being accidentally modified later in the code. CTL validator will report an error on any attempt to assign a value to a constant. Note that modifications via function calls, e.g. clear(), are not checked.

    Example 67.19. Constants

    const integer INT_CONSTANT = 10;
    const string MY_ID = "ABC";
    const string[] LIST_CONSTANT = ["a", "b", "c"];
    INT_CONSTANT = 11; // error
    MY_ID = ""; // error
    LIST_CONSTANT[0] = "x"; // error
    clear(LIST_CONSTANT); // not checked