Constraint¶
Data Constraint or Metadata Constraint Overview¶
A SDMX Data or Metadata Constraint provides the ability to further restrict the allowable content of a Codelist in the context of a Data or Metadata Structure Definition a Data or Metadataflow, a Provision or Metadata Provision Agreement, or Data or Matadata Provider. Collectively these are termed as Constrainable Structures.
Structure Properties¶
| Structure Type | Standard SDMX Structural Metadata Artefact |
| Maintainable | Yes |
| Identifiable | Yes |
| Item Scheme | No |
| SDMX Information Model Versions | 3.0 |
| URN - DataConstraint namespace | urn:sdmx:org.sdmx.infomodel.datastructure.DataConstraint |
Context within the SDMX 3.0 Information Model¶
Usage¶
Constraints can be used to specify a subset of the theoretical content of data set or metadata set which can be derived from the specification of the DSD or MSD.
Each Constraint references a type of Structure and within that type many structures can be constrained.