GB/T 40708-2021 in English

Standard Framework and Technological Evolution

As an important component of container transport EDI in the GB/T series, this standard continues the normative requirements of basic standards such as GB/T1836 (container code) and GB/T7408 (time format), and achieves international integration with the IMO "Guidelines for Electronic Transmission of Container Cargo Information". Compared with the 2008 version of the message specification, the main technical breakthroughs are reflected in:

Core element analysis

Message structure design

The standard adopts a three-layer tree structure:

1. Message header: Contains routing information such as sender (SenderCode), receiver, etc.
2. Comprehensive transportation information: Basic ship data (VesselCode), voyage (VoyageNo.) and operation timestamp
3. Container information: Detailed record of 53 attributes such as container number (Ctn.No.), size type, etc.

Key data specifications

• Time format: Strictly follow the YYYYMMDDThhmmss format of GB/T7408
• Status code: Container status uses a 2-digit letter code (such as EF-export heavy container)
• Weight unit: Kilogram (kg) is uniformly used as the unit of measurement

Implementation suggestions

System connection solution

The following technical route is recommended:

Typical application scenarios

Key points for compliance inspection

1. Required field verification (such as Ctn.No., VesselCode)
2. Code value domain verification (container type must comply with GB/T1836)
3. Business logic verification (unloading end time must not be earlier than start time)