Editing National identification number (section)

====Validation====
A South African person identification number is a 13-digit number containing only numeric characters, and no whitespace, punctuation, or alpha characters. It is defined as YYMMDDGSSSCAZ:

* YYMMDD represents the date of birth (DoB);
* GSSS is a daily sequence number, where female newborns are assigned numbers starting with 0000 to 4999, male newborns from 5000 to 9999, and the sequence is reset each day;
* C is citizenship status, with 0 if the person is a SA citizen and 1 if the person is a permanent resident;
* A is 8 or 9, although prior to 1994 this number was used to indicate the holder's race;
* Z is a checksum digit.

As an example, the ID Number 500015009087 would be assigned to a citizen born on 5 July 1998, who was the tenth male to be registered that day (the first male's number would contain 5000, the second 5001, etc.)

The checksum digit is calculated using the [[Luhn algorithm]]<ref>{{cite web|last=SML-FX.COM |title=SAIDValidator |url=http://xml-fx.com/services/SAIDValidator.aspx |access-date=28 July 2011 |url-status=dead |archive-url=https://web.archive.org/web/20110830163555/http://xml-fx.com/services/saidvalidator.aspx |archive-date=30 August 2011 }}</ref> or its equivalent, shown below:

* X<sub>1</sub> = the sum of the digits in the ID number's odd positions (excluding Z)
* X<sub>2</sub> = 2 multiplied by the concatenation of the digits in the ID number's even positions
* X<sub>3</sub> = the sum of the digits in X<sub>2</sub>
* X<sub>4</sub> = X<sub>1</sub> + X<sub>3</sub>
* Z = the difference between 10 and the last digit of X<sub>4</sub> (X<sub>4</sub> mod 10)