description: DART stands for 'Dates Affecting Readiness to Treat' and is defined as:\r\nPeriods of time between the Decision To Treat (DTT) and the Procedure Date when the patient is unavailable for a procedure due to patient-related reasons. package_name: ca.on.ehr.r4 derivation: constraint name: DART type: Extension elements: extension: mustSupport: true index: 0 slicing: slices: StartDate: match: {} schema: mustSupport: true index: 0 extensions: {} elements: extension: {index: 1} url: pattern: {type: Uri, value: StartDate} index: 2 value: choices: [valueDateTime] index: 4 valueDateTime: {type: dateTime, choiceOf: value, index: 5} EndDate: match: {} schema: mustSupport: true index: 6 extensions: {} elements: extension: {index: 7} url: pattern: {type: Uri, value: EndDate} index: 8 value: choices: [valueDateTime] index: 10 valueDateTime: {type: dateTime, choiceOf: value, index: 11} DARTCodes: match: {} schema: mustSupport: true index: 12 extensions: {} elements: extension: {index: 13} url: pattern: {type: Uri, value: DARTCodes} index: 14 value: choices: [valueCodeableConcept] index: 16 valueCodeableConcept: {type: CodeableConcept, choiceOf: value, index: 17} url: pattern: {type: Uri, value: 'http://fhir.infoway-inforoute.ca/io/CA-eReC/StructureDefinition/DART-ext'} index: 18 value: label: To Date choices: [] index: 20 package_version: 1.0.0-snapshot4 extensions: StartDate: url: null mustSupport: true index: 0 extensions: {} elements: extension: {index: 1} url: pattern: {type: Uri, value: StartDate} index: 2 value: choices: [valueDateTime] index: 4 valueDateTime: {type: dateTime, choiceOf: value, index: 5} EndDate: url: null mustSupport: true index: 6 extensions: {} elements: extension: {index: 7} url: pattern: {type: Uri, value: EndDate} index: 8 value: choices: [valueDateTime] index: 10 valueDateTime: {type: dateTime, choiceOf: value, index: 11} DARTCodes: url: null mustSupport: true index: 12 extensions: {} elements: extension: {index: 13} url: pattern: {type: Uri, value: DARTCodes} index: 14 value: choices: [valueCodeableConcept] index: 16 valueCodeableConcept: {type: CodeableConcept, choiceOf: value, index: 17} class: extension kind: complex-type url: http://fhir.infoway-inforoute.ca/io/CA-eReC/StructureDefinition/DART-ext base: http://hl7.org/fhir/StructureDefinition/Extension version: null