Details
Description
FHIR-28284 included a set of changes to support a union type for product and dependsOn values but omitted Id as a supported data type.
One of the key use-cases for these concept map changes is to support things like the UK's map from READ -> SNOMED plus descriptionIds. descriptionIds are not concepts but are actually Ids (see https://fhir.hl7.org.uk/STU3/StructureDefinition/Extension-coding-sctdescid for example).