description: 'Marks that the expansion is incomplete, because the full value set is too large to represent, and the client asked for an incomplete fragment. Used in STU3 and earlier terminology services. The information it provides should be communicated with operation outcome code = too-costly by a terminology server based on a more recent FHIR version. ' package_name: hl7.fhir.uv.extensions.r5 derivation: constraint name: VSTooCostly type: Extension elements: extension: {index: 0} url: pattern: {type: uri, value: 'http://hl7.org/fhir/StructureDefinition/valueset-toocostly'} type: uri 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/valueset-toocostly base: http://hl7.org/fhir/StructureDefinition/Extension version: 5.3.0-ballot-tc required: [value, valueBoolean]