description: This extension is derived from the [SDC Questionnaire Response](http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaireresponse) profile and enforces the various elements of signature documented in the CDex guide to represent an enveloped signature. It adds the following constraints:\n- The signature extensions use the CDex Signature Profile package_name: hl7.fhir.us.davinci derivation: constraint name: CDEXSDCQuestionnaireResponse type: QuestionnaireResponse elements: extension: index: 0 slicing: slices: signature: match: {} schema: index: 0 elements: value: choices: [valueSignature] index: 2 valueSignature: {type: Signature, choiceOf: value, index: 3} item: index: 4 extensions: ItemSignature: url: null index: 5 elements: value: choices: [valueSignature] index: 7 valueSignature: {type: Signature, choiceOf: value, index: 8} elements: extension: index: 5 slicing: slices: ItemSignature: match: {} schema: index: 5 elements: value: choices: [valueSignature] index: 7 valueSignature: {type: Signature, choiceOf: value, index: 8} package_version: cdex-2.0.0 extensions: signature: url: null index: 0 elements: value: choices: [valueSignature] index: 2 valueSignature: {type: Signature, choiceOf: value, index: 3} class: profile kind: resource url: http://hl7.org/fhir/us/davinci-cdex/StructureDefinition/cdex-sdc-questionnaireresponse base: http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaireresponse version: 2.0.0