I do not understand what this is trying to say. The author of a DSD might give a component an identifier that just so happens to be equal to the ID of the referenced conceptIdentity, but the identifier used in groupDimensions always refers to IDs as specified in DimensionList. So this does not seem to add anything helpful to the specification.
(In doubt, please handle this as a public review comment on SDMX 3.1 once the comment period begins.)
https://github.com/sdmx-twg/sdmx-json/blob/71fe5eaa9fcd29e3c15f2f0216a19b9b650b1dbd/structure-message/docs/1-sdmx-json-field-guide.md#group says »Note that the id of a dimension may be inherited from its underlying concept - therefore this reference value may actually be the id of the concept.«
I do not understand what this is trying to say. The author of a DSD might give a component an identifier that just so happens to be equal to the ID of the referenced conceptIdentity, but the identifier used in
groupDimensionsalways refers to IDs as specified inDimensionList. So this does not seem to add anything helpful to the specification.(In doubt, please handle this as a public review comment on SDMX 3.1 once the comment period begins.)