ISSN.h

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/*
 * ISSN.h
 *    PostgreSQL type definitions for ISNs (ISBN, ISMN, ISSN, EAN13, UPC)
 *
 * Information recompiled by Kronuz on November 12, 2004
 * http://www.issn.org/
 *
 * IDENTIFICATION
 *    contrib/isn/ISSN.h
 *
 * 1144-875X <=> 1144875(X) <=> 1144875 <=> (977)1144875 <=> 9771144875(00) <=> 977114487500(7) <=> 977-1144-875-00-7
 *
 *
 * ISSN         1   1   4    4    8    7    5
 * Weight       8   7   6    5    4    3    2
 * Product      8 + 7 + 24 + 20 + 32 + 21 + 10 = 122
 *              122 / 11 = 11 remainder 1
 * Check digit  11 - 1 = 10 = X
 * => 1144-875X
 *
 * ISSN         9   7    7   1   1   4    4   8    7   5    0   0
 * Weight       1   3    1   3   1   3    1   3    1   3    1   3
 * Product      9 + 21 + 7 + 3 + 1 + 12 + 4 + 24 + 7 + 15 + 0 + 0 = 103
 *              103 / 10 = 10 remainder 3
 * Check digit  10 - 3 = 7
 * => 977-1144875-00-7 ??  <- supplemental number (number of the week, month, etc.)
 *                ^^ 00 for non-daily publications (01=Monday, 02=Tuesday, ...)
 *
 * The hyphenation is always in after the four digits of the ISSN code.
 *
 */
 
/* where the digit set begins, and how many of them are in the table */
static const unsigned ISSN_index[10][2] = {
    {0, 1},
    {0, 1},
    {0, 1},
    {0, 1},
    {0, 1},
    {0, 1},
    {0, 1},
    {0, 1},
    {0, 1},
    {0, 1},
};
static const char *ISSN_range[][2] = {
    {"0000-000", "9999-999"},
    {NULL, NULL}
};