description: 'R5: `Appointment.participant.required` additional types (boolean) additional types from child elements (value)' package_name: hl7.fhir.uv.xver-r5.r4 derivation: constraint name: ExtensionAppointment_Participant_Required type: Extension elements: url: base: {max: '1', min: 1, path: Extension.url} pattern: {type: Uri, value: 'http://hl7.org/fhir/5.0/StructureDefinition/extension-Appointment.participant.required'} index: 0 value: short: The participant is required to attend (optional when false) choices: [valueBoolean] base: {max: '1', min: 0, path: 'Extension.value[x]'} index: 2 valueBoolean: short: The participant is required to attend (optional when false) type: boolean base: {max: '1', min: 0, path: 'Extension.value[x]'} choiceOf: value index: 3 package_version: 0.1.0 class: extension kind: complex-type url: http://hl7.org/fhir/5.0/StructureDefinition/extension-Appointment.participant.required base: http://hl7.org/fhir/StructureDefinition/Extension|4.0.1 version: 0.1.0 required: [url]