description: The URL that goes directly to the plan brochure for the specific standard plan or plan variation package_name: hl7.fhir.us.davinci-drug-formulary derivation: constraint name: MarketingURL type: Extension elements: extension: {index: 0} url: type: uri pattern: {type: Uri, value: 'http://hl7.org/fhir/us/Davinci-drug-formulary/StructureDefinition/usdf-MarketingURL-extension'} index: 1 valueString: {type: string, index: 2} package_version: 0.1.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/us/Davinci-drug-formulary/StructureDefinition/usdf-MarketingURL-extension base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.1.0 required: [valueString]