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=== Bileşenler===
The '''GTIN-13''' encoded in the barbarkod codekodlamasında hasdört fourbileşen componentsvardır:
* GS1 öneki, ilk iki veya üç hanedir ve genelde üreticinin hangi ulusal GS1 Üye Organizasyonuna kayıtlı olduğunu belirtir (ürünün gerçekte nerede üretildiği önemli değildir). EAN-13 sembolü 10 haneli bir [[ISBN]] numarasını kodlarken GS1 öneki 978 veya 979, [[ISSN]]ler için 977 olacaktır.
* The GS1 Prefix, the first two or three digits, usually identifying the national GS1 Member Organisation to which the manufacturer is registered (not necessarily where the product is actually made). When the EAN-13 symbol encodes a conversion of a 10-digit [[ISBN]] number, the GS1 Prefix will be 978 or 979, or 977 for [[ISSN]]s.
* TheŞirket Company numbernumarası, consisting of four, five or six digits depending on number of GTIN-13s required by the manufacturer to identify different product lines (in ISBN and ISSN, this component is used to identify the language in which the publication was issued and managed by a transnational agency covering several countries, or to identify the country where the legal deposits are made by a publisher registered with a national agency, and it is further subdivided any allocating subblocks for publishers ; many countries have several prefixes allocated in the ISSN and ISBN registries).
* The Item reference, consisting of two to six digits (in ISBN and ISSN, it uniquely identifies the publication from the same publisher ; it should be used and allocated by the registered publisher in order to avoid creating gaps ; however it happens that a registered book or serial never gets published and sold).
* Check digit, a single [[checksum]] digit. The check digit is computed modulo 10, where the weights in the checksum calculation alternate 1 and 3. In particular, since the weights are relatively prime to 10 the EAN system will detect all single digit errors. But, since the difference of consecutive weights is even, the EAN system does not detect all adjacent transposition errors.