description: If true, indicates the channel should be treated as though it is using a non-guaranteed delivery mechanism, effectively labeling the subscription as 'best effort'. package_name: hl7.fhir.uv.extensions.r3 derivation: constraint name: SubscriptionBestEffort type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/subscription-best-effort'} index: 1 value: choices: [valueBoolean] index: 3 valueBoolean: {type: boolean, choiceOf: value, index: 4} package_version: 5.3.0-ballot-tc extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/subscription-best-effort base: http://hl7.org/fhir/StructureDefinition/Extension version: 5.3.0-ballot-tc required: [value, valueBoolean]