description: Determines whether the activity is to enroll or unenroll the patient in the specified strategy or pathway. package_name: hl7.fhir.uv.cpg.r4b derivation: constraint name: CPGIsUnenrollment type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/uv/cpg/StructureDefinition/cpg-isUnenrollment'} index: 1 value: choices: [valueBoolean] index: 3 valueBoolean: {type: boolean, choiceOf: value, index: 4} package_version: 2.0.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/uv/cpg/StructureDefinition/cpg-isUnenrollment base: http://hl7.org/fhir/StructureDefinition/Extension version: 2.0.0