description: Provides a textual description of the strength of the active ingredient(s) in the medication package_name: ca.ab.fhir.psab derivation: constraint name: ExtMedicationStrengthDescription type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://prescribeit.ca/fhir/StructureDefinition/ext-medication-strength-description'} index: 1 value: choices: [valueString] index: 3 valueString: {type: string, choiceOf: value, index: 4} package_version: 1.2.0-pre2 extensions: {} class: extension kind: complex-type url: http://prescribeit.ca/fhir/StructureDefinition/ext-medication-strength-description base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.2.0 required: [valueString, value]