The GS1 Identification System provides two types of identifiers. The first or primary identifiers are called GS1 Keys like the Global Trade Item Number (GTIN) or Global Location Number (GLN). The GS1 identification keys allow the retrieval of information stored in computer databases. Beyond the Keys, the GS1 Identification System also provides application identifiers to provide information about key "attributes" like Lot Numbers ,Expiration Date etc.
Trade items: Products and services that are priced, ordered or invoiced at any point in the supply chains can be identified by using Global Trade Item Number (GTIN).
Logistic units: Physical units established for transport and storage of products of any kind that need to be tracked and traced individually in a supply chain can be identified by using Serial Shipping Container Code (SSCC).
Assets: Fixed and returnable assets can be identified by using Global Individual Asset Identifier(GIAI) and Global Returnable Asset Identifier(GRAI) respectively.
Locations/Entities: Physical, functional or legal entities requiring a permanent identification, such as a company, department, or warehouse can be identified by using Global Location Number (GLN).
Service Relations: Public or private service provider can track any customer's service requirements and needs over a continuing relationship by using Global Service Relation Number (GSRN).
Documents: Documents such as insurance policy, proof of shipment form, internal invoice, phone bill, etc are linked with the database that holds the ‘master’ copy of the document by using Global Document Type Identification ( GDTI).
Shipments: Groupings of logistics units meant for trade, referencing a dispatch advice and/or Bill of Lading (BOL), are identified using Global shipment Identification Number (GSIN) which comply with the regulations of the World Customs Organization (WCO).
Consignments: Groupings of logistics units that are assembled to be transported together under one transport document, are identified using Global Identification Number for Consignments (GINC).