description: Provides the snapshot.element.id of the element within the profile containing this extension to use as the starting point for validation of the element on which the profile is declared. This is used when a backbone element is being profiled, rather than an established type. package_name: hl7.fhir.uv.extensions.r4b derivation: constraint name: ProfileElement type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/elementdefinition-profile-element'} index: 1 value: choices: [valueString] index: 3 valueString: {type: string, choiceOf: value, index: 4} package_version: 5.3.0-ballot-tc1 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/elementdefinition-profile-element base: http://hl7.org/fhir/StructureDefinition/Extension version: 5.3.0-ballot-tc1 required: [valueString, value]