description: This profile represents the constraints applied to the Quantity data type by the PS-CA project to use UCUM as the code system for units. package_name: ca.infoway.io.psca derivation: constraint name: QuantityPSCA type: Quantity elements: system: short: UCUM system for units pattern: {type: Uri, value: 'http://unitsofmeasure.org'} mustSupport: true index: 0 code: {mustSupport: true, index: 1} package_version: 2.2.0-ti-ballot class: complex-type kind: complex-type url: http://fhir.infoway-inforoute.ca/io/psca/StructureDefinition/Quantity-ca-ps base: http://hl7.org/fhir/StructureDefinition/Quantity version: 2.2.0 required: [system, code]