ISO/IEC 15459-5:2014规定了用于识别单个可退货运输项目（RTI）的唯一字符串。该字符串用于在条形码标签或其他自动识别和数据捕获（AIDC）介质中表示，以满足管理需要。为了满足管理需求，ISO/IEC 15459的各个部分中识别了不同类别的身份，这使得与每个类别相关的身份能够满足不同的要求。 RTI的标识规则（标识与项目的整个生命周期相关）由示例定义和支持。

ISO/IEC 15459-5:2014 specifies a unique string of characters for the identification of individual returnable transport items (RTIs). The character string is intended to be represented in a bar code label or other automatic identification and data capture (AIDC) media attached to the item to meet management needs. To address management needs, different classes of identities are recognized in the various parts of ISO/IEC 15459, which allows different requirements to be met by the identities associated with each class. The rules for the identification of RTIs, with the identity being relevant for the complete lifecycle of the item, are defined and supported by example.