Uniform Identification Code Coding Rules for Urban Digital Public Infrastructure
1Key Takeaways
The "Urban Digital Public Infrastructure Unified Identification Code Coding Rules" is now approved as a product standard for the urban and rural construction industry, numbered CJ/T553-2024, and will be implemented from August 1, 2024. This standard is publicly available on the Ministry of Housing and Urban-Rural Devel…
2Expert Interpretation
An in-depth interpretation of the coding system of the 21-digit unified identification code (UIC) for urban digital public infrastructure in the CJ/T 553-2024 standard, including the structural design principles of administrative division codes, classification codes and custom codes, as well as application specifications for classification code tables for eight major categories such as transportation facilities and water conservancy facilities, to help with data standardization governance in the construction of Digital China.
Analysis of the core framework of the standard
The 21-digit UIC coding system constructed by this standard consists of three parts: 6-digit administrative division code (GB/T 2260), 6-digit classification code (including three levels of major/medium/minor categories), and 9-digit custom code. This structural design ensures the uniqueness of the code while retaining the flexibility of local expansion.
Comparison of classification code systems
| Dimensions | This standard | GB/T 30428.2 | GB/T 28590 |
|---|---|---|---|
| Hierarchical depth | Level 3 (major category-middle category-minor category) | Level 2 | Level 4 |
| Coverage | 8 major categories and 62 medium categories (including digital infrastructure) | 6 major categories and 84 small categories | 12 major categories of underground facilities |
| Extension mechanism | Reserve "99" custom code segment | No clear extension rule | Expand by professional field |
Key technical features
Example: Traffic facility coding implementation
UIC code of a highway section: 510106(Jinniu District, Chengdu)+322011(Traffic facilities-Highway-Highway)+000000001(Serial number), the complete code is 510106322011000000001
The code is implemented through the 32 major code and GB/T 21381 road code mapping, and use custom fields to record pile number information.
Implementation suggestions
- Stock system transformation: It is recommended to achieve two-way conversion between UIC code and original industry code through middleware
- Classification code maintenance: Establish a provincial classification code review committee and update the extended catalog once a year
- Data governance: Combine the basic attribute data table in Appendix A to design metadata management specifications
Standard evolution analysis
This standard innovatively combines the administrative division system of MA coding and the hierarchical classification concept of GS1 coding. Its 21-digit fixed-length design is more conducive to manual verification than GUID coding. In the future, QR code carrier specifications may be added to expand application scenarios.