# stdnum.nl.onderwijsnummer

Onderwijsnummer (Dutch student school number).

The onderwijsnummers (education number) is very similar to the BSN (Dutch national identification number) for students without a BSN. It uses a checksum mechanism similar to the BSN.

More information:

- https://nl.wikipedia.org/wiki/Onderwijsnummer

    >>> validate('1012.22.331')
    '101222331'
    >>> validate('100252333')
    Traceback (most recent call last):
        ...
    InvalidChecksum: ...
    >>> validate('1012.22.3333')
    Traceback (most recent call last):
        ...
    InvalidLength: ...
    >>> validate('2112.22.337')  # number must start with 10
    Traceback (most recent call last):
        ...
    InvalidFormat: ...

`stdnum.nl.onderwijsnummer.``compact`(number)

  Convert the number to the minimal representation. This strips the number of any valid separators and removes surrounding whitespace.

`stdnum.nl.onderwijsnummer.``validate`(number)

  Check if the number is a valid onderwijsnummer. This checks the length and whether the check digit is correct and whether it starts with the right sequence.

`stdnum.nl.onderwijsnummer.``is_valid`(number)

  Check if the number is a valid onderwijsnummer.