From https://github.com/sdmx-twg/sdmx-json
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structure-json (note: structure-schema hasn't been pushed to their master branch yet)
These are the working structure data types:
dataStructures,conceptSchemes,codelists,agencySchemes,dataProviderSchemes,dataConsumerSchemes,organisationUnitSchemes,dataflows,metadataflows,provisionAgreements,structureSets,categorisations,attachmentConstraints,contentConstraints