description: The number of prescribed Fractions in this scope.\nThis extension SHALL only be present if the treatment is structured as countable Fractions, for example in a Phase Prescription. package_name: hl7.fhir.us.codex derivation: constraint name: RadiotherapyFractionsPrescribed type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/us/codex-radiation-therapy/StructureDefinition/codexrt-radiotherapy-fractions-prescribed'} index: 1 value: short: Number of Prescribed Fractions choices: [valuePositiveInt] index: 3 valuePositiveInt: {type: positiveInt, short: Number of Prescribed Fractions, choiceOf: value, index: 4} package_version: radiation-therapy-1.0.0-ballot extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/us/codex-radiation-therapy/StructureDefinition/codexrt-radiotherapy-fractions-prescribed base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.0.0-ballot required: [valuePositiveInt, value]