urn:sdmx:org.sdmx.infomodel.codelist.Codelist=SDMX:CL_FREQ(2.1)

An SDMX URN is composed of five parts:

1. URN prefix — urn:sdmx:org.sdmx.infomodel

   This is unique to SDMX and has a fixed value

2. SDMX Structure - codelist.Codelist

   Each structure is uniquely identified by its package and its class name.

   See SDMX Structures for the full list of SDMX structures.

3. SDMX Agency ID — SDMX

   Identifies the Agency responsible for maintaining the structure. The Agency ID helps the resolver locate the authoritative source.

   See SDMX Agency for more details.

4. Structure ID — CL_FREQ

   A unique identifier for the structure. The structure ID is defined by the maintaining Agency when the structure is first created.

5. Structure Version — 2.1

   The version of the structure, also defined by the Agency. Versions may use a two-part format (e.g. 1.0) or a three-part semantic version format (e.g., 1.0.0 = major.minor.patch). For semantically versioned structures, the resolver can automatically find the latest available version.

   See Structure Versioning for more details.

Sub-Structres

URNs are also used to identify structures that are contained inside a parent struture, for example a Code within a Codelist.

For sub-structures, the URN changes in two ways.

1. The target structure type changes.
2. The ID of the sub-structure is appended to the end of the URN

urn:sdmx:org.sdmx.infomodel.codelist.Code=SDMX:CL_FREQ(2.1).A

Resolving Sub-Structres

The URN resolver service is able to resolve specific Items in an Item Schemes by returning the parent structure as a partial list. For URNs that do not belong to an item sheme, the URN resolver will return the parent structure.

Examples