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| The barcode represents a 14-digit number having the following structure |
| Digit: |
1 |
2345 |
6 7 8 9 10 11 12 13 |
14 |
| Meaning: |
Item Type |
Institution Number |
Item or Patron Identification Number |
Check Digit |
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| Item Type: Distinguishes materials (value = 3) form patron (value = 2) |
| Institution Number: A four-digit number representing the library (institution) whose barcodes this is. |
| Item or Patron Identification Number:This is a sequentially-assigned, 8-digit number representing the items in the library’s collection. Beginning numbering with 00000001. |
| Check Digit: This is a modulus-10, type-1 check digit, calculated as follows, using the values of digit 1-13: |
- Multiply the value in each odd-numbered position by 2
- If the product is a 2-digit number, add the two digits together. In any case, add the result to a running total
- Add the value in each even-numbered position to the running total
- Divide the final total by 10
- Subtract the remainder from 10
- Divide the results by 10
- The remainder (not dividend) is the check digit
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| For example: |
Position: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 |
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Value: 3 0 2 3 4 0 0 0 5 1 7 8 6 ? |
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- 3 x 2, 2 x 2, 4 x 2, 0 x 2, 5 x 2, 7 x 2, 6 x 2
- 6 + 4 + 8 + 0 + 1 + 5 + 3 =27
- 27 + 0, 27 + 3; 30 + 0; 30 + 0; 30 + 1; 31 + 8 = 39
- 39 / 10 = 3 with remainder 9
- 10 – 9 = 1
- 1 / 10 = 0 with remainder 1
- complete the barcoded number by adding the check digit, 1, in the 14 position, thus yielding the complete number:
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