description: This cross-version extension represents ActivityDefinition.product[x] from http://hl7.org/fhir/StructureDefinition/ActivityDefinition|3.0.2 for use in FHIR R4B. package_name: rs/hl7.fhir.uv.xver derivation: constraint name: ext_R3_ActivityDefinition_product type: Extension elements: value: base: {path: 'Extension.value[x]'} short: What's administered/supplied choices: [valueReference, valueCodeableConcept] index: 1 valueReference: short: What's administered/supplied refers: ['http://hl7.org/fhir/StructureDefinition/Medication', 'http://hl7.org/fhir/StructureDefinition/Substance'] type: Reference base: {path: 'Extension.value[x]'} choiceOf: value index: 2 valueCodeableConcept: base: {path: 'Extension.value[x]'} type: CodeableConcept short: What's administered/supplied choiceOf: value index: 3 url: pattern: {type: uri, value: 'http://hl7.org/fhir/3.0/StructureDefinition/extension-ActivityDefinition.product'} type: uri index: 4 package_version: r3.r4b-0.0.1-snapshot-1 class: extension kind: complex-type url: http://hl7.org/fhir/3.0/StructureDefinition/extension-ActivityDefinition.product base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.0.1-snapshot-1 required: [url]