990601-1 |
Write an ABNF specification for Swedish social security numbers, written in the format shown by the example 41 02 01-1410. It is an advantage if the syntax shows that a social security number consists of local elements: Date, month and day of birth, a three-digit sequence number and a single check digit in the last character position. |
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Answer |
Solution 1:year = 2D month = 2D day = 2D seqno = 3D checkdigit = D social-security-number = year " " month " " day Solution 2:year = 2D month = ("1" / "2" / "3" ) D day = ("0" / "1" / "2" / "3" ) D seqno = 3D checkdigit = D social-security-number = year " " month " " day Solution 3:year = 2D month = "01" / "02" / "03" / "04" / "05" / "06" / "07" / "08" / "09" / "10" / "11" / "12" day = "01" / "02" / "03" / "04" / "05" / "06" / "07" / "08" / "09" / "10" / "11" / "12" / "13" / "14" / "15" / "16" / "17" / "18" / Note: A correct social-security number (personnummer) in Sweden should never contain a latter. Numbers with letters in them are fictious numbers created by some systems in order to represent people who do not have any Swedish personnummer. |