全球贸易项目代码（Global Trade Item Number）
GTIN是编码系统中应用最广泛的标识代码。贸易项目是指一项产品或服务。GTIN是为全球贸易项目提供唯一标识的一种代码（称代码结构）。
GTIN有四种不同的代码结构：GTIN-13、GTIN-14、GTIN-8和GTIN-12（如下图）。这四种结构可以对不同包装形态的商品进行唯一编码。标识代码无论应用在哪个领域的贸易项目上，每一个标识代码必须以整体方式使用。完整的标识代码可以保证在相关的应用领域内全球唯一。
对贸易项目进行编码和符号表示，能够实现商品零售（POS）、进货、存补货、销售分析及其他业务运作的自动化。
GTIN的四种代码结构：
GTIN有4种不同的代码结构：GTIN-13、GTIN-14、GTIN-8和GTIN-12，这4种结构可以对不同包装形态的商品进行唯一编码，每种代码结构均可使用一维条码、二维条码、射频标签来作为数据载体。
为什么推广使用商品条码？
进出口商品种类越来越多、进出口商品数量越来越大、进出口贸易政策越来越复杂、管理要求越来越高。
如何在单一窗口实现智能辅助填制？
登入单一窗口标准版-货物申报-进口整合申报-进口报关单整合申报-录入表头表体信息-商品规格型号-商品条码（必须为8位、12位、13位长度的数字）-回车（系统校验信息成功）-系统自动反填该商品条码包含的申报要素信息。
对于GTIN系统是如何比对的？
分为两种：
- （一） 系统首先自动查找海关总署提供的GTIN相关参考信息，如果对碰成功，即可自动反填。
- （二）系统如未查到参考信息，则自动设置增加查找条件，包括境内收发货人海关10位数商品编码+商品编码+GTIN码查找历史参数进行调用。
Global Trade Item Number (GTIN)
The Global Trade Item Number (GTIN) can be used by a company to uniquely identify all of its trade
items. GS1 defines trade items as products or services that are priced, ordered or invoiced at any point in the supply chain.
- The GTIN can be used to identify types of products at any packaging level (e.g., consumer unit, inner pack, case, pallet). Groups of trade items with similar production and usage characteristics such as production batches can be further identified with the help of the batch / lot number, expiry date, and similar data elements. Individual trade items can be uniquely identified using a GTIN plus serial number
- Once a company has assigned a GTIN to a trade item, it provides a common language for all of its entities and trading partners worldwide to uniquely identify the item and easily communicate information about the item.
- The GTIN can be encoded in a barcode or an EPC/RFID tag. By scanning the barcode or EPC/RFID tag, companies can efficiently and accurately process products and related information; for example, at check out in a store, when receiving goods in a warehouse, and when administering medication in a hospital.
- GTINs can be used to unambiguously identify trade items online, for example in catalogues, in electronic messages such as purchase orders and invoices, and embedded in web pages to optimise use by search engines and other information consumers.
THE GTIN IS FULLY COMPATIBLE WITH ISO/IEC 15459 – PART 4: INDIVIDUAL PRODUCTS AND PRODUCT PACKAGES
There are four GTIN formats. For applications that require a uniform 14-digit format, leading zeroes need to be added:
- 000000nnnnnnnn (GTIN-8)
- 00nnnnnnnnnnnn (GTIN-12)
- 0nnnnnnnnnnnnn (GTIN-13)
