1 /*
2  * ISSN.h
3  *	  PostgreSQL type definitions for ISNs (ISBN, ISMN, ISSN, EAN13, UPC)
4  *
5  * Information recompiled by Kronuz on November 12, 2004
6  * http://www.issn.org/
7  *
8  * IDENTIFICATION
9  *	  contrib/isn/ISSN.h
10  *
11  * 1144-875X <=> 1144875(X) <=> 1144875 <=> (977)1144875 <=> 9771144875(00) <=> 977114487500(7) <=> 977-1144-875-00-7
12  *
13  *
14  * ISSN			1	1	4	 4	  8    7	5
15  * Weight		8	7	6	 5	  4    3	2
16  * Product		8 + 7 + 24 + 20 + 32 + 21 + 10 = 122
17  *				122 / 11 = 11 remainder 1
18  * Check digit	11 - 1 = 10 = X
19  * => 1144-875X
20  *
21  * ISSN			9	7	 7	 1	 1	 4	  4   8    7   5	0	0
22  * Weight		1	3	 1	 3	 1	 3	  1   3    1   3	1	3
23  * Product		9 + 21 + 7 + 3 + 1 + 12 + 4 + 24 + 7 + 15 + 0 + 0 = 103
24  *				103 / 10 = 10 remainder 3
25  * Check digit	10 - 3 = 7
26  * => 977-1144875-00-7 ??  <- supplemental number (number of the week, month, etc.)
27  *				  ^^ 00 for non-daily publications (01=Monday, 02=Tuesday, ...)
28  *
29  * The hyphenation is always in after the four digits of the ISSN code.
30  *
31  */
32 
33 /* where the digit set begins, and how many of them are in the table */
34 const unsigned ISSN_index[10][2] = {
35 	{0, 1},
36 	{0, 1},
37 	{0, 1},
38 	{0, 1},
39 	{0, 1},
40 	{0, 1},
41 	{0, 1},
42 	{0, 1},
43 	{0, 1},
44 	{0, 1},
45 };
46 const char *ISSN_range[][2] = {
47 	{"0000-000", "9999-999"},
48 	{NULL, NULL}
49 };
50