def METHOD_NAME(primaryId):
    '''
        Return the string of an element list (path)
        cases: a => 'l_a' (reference to a variable)
        a_timer => 'a_timer'  (reference to a timer)
        a!b => a.b (field of a structure)
        a!b if a is a CHOICE => TypeOfa_b_get(a)
        a(Expression) => a(ExpressionSolver) (array index)
        Expression can be complex (if-then-else-fi..)
    '''
    pass