S1000D DMC: Data Module Code Fields and Coding Rules
The Data Module Code (DMC) is a structured identity, not an arbitrary file name. It helps a CSDB distinguish, reference, version and publish the correct module.
Which fields are commonly involved?
| Field family | Typical meaning | Control point |
|---|---|---|
| Model identification | Product or model scope. | Match the approved model and configuration list. |
| System and SNS codes | System, subsystem and lower-level breakdown. | Map the codes to the approved system breakdown. |
| Assembly and disassembly codes | Assembly, disassembly and variation context. | Keep component hierarchy and variation rules stable. |
| Information codes | Information type and its variation. | Use controlled code lists and explain exceptions. |
| Location and project differences | Object position or project-defined difference. | Do not use temporary revision numbers as stable identity fields. |
How should a project govern DMC rules?
- Define field ownership, code lists and approval responsibilities.
- Map DMC fields to the SNS and DMRL.
- Record prohibited combinations and exceptions in business rules.
- Trial the scheme with description, procedure, parts and fault-isolation modules.
- Keep mappings between DMCs, file names, legacy identifiers and publication references.
Common mistakes
- Using different DMCs for the same module in the CSDB, file name and publication reference.
- Putting serial numbers, release dates or temporary status values into stable identity fields.
- Creating system codes without an approved SNS mapping.
- Checking only the pattern while ignoring title, information type and technical purpose.
See the Data Modules and CSDB guides for the surrounding controls.
Scope note: Exact field order, lengths, values and mandatory attributes must be verified against the adopted S1000D Issue and project rules.
Frequently asked questions
Is a DMC the same as a file path?
No. A DMC identifies the Data Module; a project may map it to a file name or storage path without changing its meaning.
Can a project invent any DMC format?
Only within the boundaries allowed by the adopted Issue, schemas, data dictionary, business rules and contract.