'Takes in the value in canonical form and checks the verifier digit. The
method is modulo 11.'

def _validate(self, value):

    check = [3, 2, 7, 6, 5, 4, 3, 2, 1, 0]
    return ((sum([(int(value[i]) * check[i]) for i in range(10)]) % 11) == 0)
