http://hl7.org/fhir/StructureDefinition/valueset-expand-group|4.0.1

This extension declares a group of concepts that is generated into the ValueSet.expansion.contains hierarchy when the expansion is generated for a UI. THere is no inherent assigned meaning to the hierarchy; it is used to help the user navigate the concepts. Each group has a display and/or a code, and a list of members, which are either concepts in the value set, or other groups (by code).
element_idtypes
Extension.url
Extension.value[x]
Extension
Extension.extension:code
Extension.extension:code.extension
Extension.extension:code.url
Extension.extension:code.value[x]
Extension.extension:display
Extension.extension:display.extension
Extension.extension:display.url
Extension.extension:display.value[x]
Extension.extension:member
Extension.extension:member.extension
Extension.extension:member.url
Extension.extension:member.value[x]
Extension.url
Extension.value[x]
Extension
Extension.id
Extension.extension
Extension.extension:code
Extension.extension:code.id
Extension.extension:code.extension
Extension.extension:code.url
Extension.extension:code.value[x]
Extension.extension:display
Extension.extension:display.id
Extension.extension:display.extension
Extension.extension:display.url
Extension.extension:display.value[x]
Extension.extension:member
Extension.extension:member.id
Extension.extension:member.extension
Extension.extension:member.url
Extension.extension:member.value[x]