description: 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).
package_name: rs/hl7.fhir.r4b.examples
derivation: constraint
name: expand-group
type: Extension
elements:
  extension:
    short: Underlying code from the system
    type: Extension
    index: 0
    slicing:
      slices:
        code:
          match: {}
          schema:
            short: Underlying code from the system
            type: Extension
            index: 0
            extensions: {}
            elements:
              extension: {index: 1}
              url:
                type: uri
                pattern: {type: uri, value: code}
                index: 2
              value:
                choices: [valueCode]
                index: 4
              valueCode: {type: code, choiceOf: value, index: 5}
            required: [value, valueCode]
        display:
          match: {}
          schema:
            type: Extension
            short: Display for the group
            index: 6
            extensions: {}
            elements:
              extension: {index: 7}
              url:
                type: uri
                pattern: {type: uri, value: display}
                index: 8
              value:
                choices: [valueString]
                index: 10
              valueString: {type: string, choiceOf: value, index: 11}
            required: [value, valueString]
        member:
          match: {}
          schema:
            min: 1
            short: Codes or other groups in this group
            index: 12
            type: Extension
            array: true
            elements:
              extension: {index: 13}
              url:
                type: uri
                pattern: {type: uri, value: member}
                index: 14
              value:
                choices: [valueCode]
                index: 16
              valueCode: {type: code, choiceOf: value, index: 17}
            _required: true
            extensions: {}
            required: [value, valueCode]
  url:
    pattern: {type: uri, value: 'http://hl7.org/fhir/StructureDefinition/valueset-expand-group'}
    type: uri
    index: 18
  value:
    choices: []
    index: 20
package_version: 4.3.0
extensions:
  code:
    url: null
    short: Underlying code from the system
    type: Extension
    index: 0
    extensions: {}
    elements:
      extension: {index: 1}
      url:
        type: uri
        pattern: {type: uri, value: code}
        index: 2
      value:
        choices: [valueCode]
        index: 4
      valueCode: {type: code, choiceOf: value, index: 5}
    required: [value, valueCode]
  display:
    url: null
    type: Extension
    short: Display for the group
    index: 6
    extensions: {}
    elements:
      extension: {index: 7}
      url:
        type: uri
        pattern: {type: uri, value: display}
        index: 8
      value:
        choices: [valueString]
        index: 10
      valueString: {type: string, choiceOf: value, index: 11}
    required: [value, valueString]
  member:
    min: 1
    short: Codes or other groups in this group
    index: 12
    type: Extension
    array: true
    elements:
      extension: {index: 13}
      url:
        type: uri
        pattern: {type: uri, value: member}
        index: 14
      value:
        choices: [valueCode]
        index: 16
      valueCode: {type: code, choiceOf: value, index: 17}
    _required: true
    extensions: {}
    url: null
    required: [value, valueCode]
class: extension
kind: complex-type
url: http://hl7.org/fhir/StructureDefinition/valueset-expand-group
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 4.3.0