FHIR IG analytics

Resources that use this resource

No resources found

Resources that this resource uses

Narrative

Note: links and images are rebased to the (stated) source

Source1

{
  "resourceType": "ConceptMap",
  "id": "R2-QuestionnaireResponse-element-map-to-R4",
  "text": {
    "status": "generated",
    "div": "<!-- snip (see above) -->"
  },
  "extension": [
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
      "valueCode": "fhir"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
      "valueInteger": 0,
      "_valueInteger": {
        "extension": [
          {
            "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
            "valueCanonical": "http://hl7.org/fhir/uv/xver/ImplementationGuide/hl7.fhir.uv.xver-r2.r4"
          }
        ]
      }
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
      "valueCode": "trial-use",
      "_valueCode": {
        "extension": [
          {
            "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
            "valueCanonical": "http://hl7.org/fhir/uv/xver/ImplementationGuide/hl7.fhir.uv.xver-r2.r4"
          }
        ]
      }
    }
  ],
  "url": "http://hl7.org/fhir/uv/xver/ConceptMap/R2-QuestionnaireResponse-element-map-to-R4",
  "version": "0.1.0",
  "name": "R2QuestionnaireResponseElementMapToR4",
  "title": "Cross-version mapping for FHIR DSTU2 QuestionnaireResponse to FHIR R4 QuestionnaireResponse",
  "status": "active",
  "experimental": false,
  "date": "2026-03-17T16:04:02.8834497-05:00",
  "contact": [
    {
      "name": "FHIR Infrastructure",
      "telecom": [
        {
          "system": "url",
          "value": "http://www.hl7.org/Special/committees/fiwg"
        }
      ]
    }
  ],
  "description": "This ConceptMap represents cross-version mappings for elements from a FHIR DSTU2 QuestionnaireResponse to FHIR R4.",
  "jurisdiction": [
    {
      "coding": [
        {
          "system": "http://unstats.un.org/unsd/methods/m49/m49.htm",
          "code": "001",
          "display": "World"
        }
      ]
    }
  ],
  "sourceCanonical": "http://hl7.org/fhir/1.0",
  "targetUri": "http://hl7.org/fhir/4.0",
  "group": [
    {
      "source": "http://hl7.org/fhir/StructureDefinition/QuestionnaireResponse",
      "sourceVersion": "1.0.2",
      "target": "http://hl7.org/fhir/StructureDefinition/QuestionnaireResponse",
      "targetVersion": "4.0.1",
      "element": [
        {
          "code": "QuestionnaireResponse.meta",
          "display": "meta",
          "target": [
            {
              "code": "QuestionnaireResponse.meta",
              "display": "QuestionnaireResponse.meta",
              "equivalence": "wider",
              "comment": "Element `QuestionnaireResponse.meta` is mapped to FHIR R4 element `QuestionnaireResponse.meta` as `SourceIsBroaderThanTarget`.\nThe mappings for `QuestionnaireResponse.meta` do not cover the following types: Meta.\nThe mappings for `QuestionnaireResponse.meta` do not cover the following types based on type expansion: lastUpdated, profile, security, tag, versionId."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.implicitRules",
          "display": "implicitRules",
          "target": [
            {
              "code": "QuestionnaireResponse.implicitRules",
              "display": "QuestionnaireResponse.implicitRules",
              "equivalence": "equivalent",
              "comment": "Element `QuestionnaireResponse.implicitRules` is mapped to FHIR R4 element `QuestionnaireResponse.implicitRules` as `Equivalent`.\nAsserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element as much as possible."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.language",
          "display": "language",
          "target": [
            {
              "code": "QuestionnaireResponse.language",
              "display": "QuestionnaireResponse.language",
              "equivalence": "equivalent",
              "comment": "Element `QuestionnaireResponse.language` is mapped to FHIR R4 element `QuestionnaireResponse.language` as `Equivalent`.\nLanguage is provided to support indexing and accessibility (typically, services such as text to speech use the language tag). The html language tag in the narrative applies  to the narrative. The language tag on the resource may be used to specify the language of other presentations generated from the data in the resource  Not all the content has to be in the base language. The Resource.language should not be assumed to apply to the narrative automatically. If a language is specified, it should it also be specified on the div element in the html (see rules in HTML5 for information about the relationship between xml:lang and the html lang attribute)."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.text",
          "display": "text",
          "target": [
            {
              "code": "QuestionnaireResponse.text",
              "display": "QuestionnaireResponse.text",
              "equivalence": "wider",
              "comment": "Element `QuestionnaireResponse.text` is mapped to FHIR R4 element `QuestionnaireResponse.text` as `SourceIsBroaderThanTarget`.\nThe mappings for `QuestionnaireResponse.text` do not cover the following types: Narrative.\nThe mappings for `QuestionnaireResponse.text` do not cover the following types based on type expansion: div, status.\nContained resources do not have narrative. Resources that are not contained SHOULD have a narrative."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.contained",
          "display": "contained",
          "target": [
            {
              "code": "QuestionnaireResponse.contained",
              "display": "QuestionnaireResponse.contained",
              "equivalence": "equivalent",
              "comment": "Element `QuestionnaireResponse.contained` is mapped to FHIR R4 element `QuestionnaireResponse.contained` as `SourceIsBroaderThanTarget`.\nThis should never be done when the content can be identified properly, as once identification is lost, it is extremely difficult (and context dependent) to restore it again."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.identifier",
          "display": "identifier",
          "target": [
            {
              "code": "QuestionnaireResponse.identifier",
              "display": "QuestionnaireResponse.identifier",
              "equivalence": "wider",
              "comment": "Element `QuestionnaireResponse.identifier` is mapped to FHIR R4 element `QuestionnaireResponse.identifier` as `SourceIsBroaderThanTarget`.\nThe mappings for `QuestionnaireResponse.identifier` do not cover the following types: Identifier.\nThe mappings for `QuestionnaireResponse.identifier` do not cover the following types based on type expansion: assigner, period, system, type, use, value."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.questionnaire",
          "display": "questionnaire",
          "target": [
            {
              "code": "QuestionnaireResponse.questionnaire",
              "display": "QuestionnaireResponse.questionnaire",
              "equivalence": "wider",
              "comment": "Element `QuestionnaireResponse.questionnaire` is mapped to FHIR R4 element `QuestionnaireResponse.questionnaire` as `SourceIsBroaderThanTarget`.\nThe mappings for `QuestionnaireResponse.questionnaire` do not cover the following types: Reference.\nThe mappings for `QuestionnaireResponse.questionnaire` do not cover the following types based on type expansion: display, reference."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.status",
          "display": "status",
          "target": [
            {
              "code": "QuestionnaireResponse.status",
              "display": "QuestionnaireResponse.status",
              "equivalence": "equivalent",
              "comment": "Element `QuestionnaireResponse.status` is mapped to FHIR R4 element `QuestionnaireResponse.status` as `SourceIsNarrowerThanTarget`.\nThe mappings for `QuestionnaireResponse.status` do not allow expression of the necessary codes, per the bindings on the source and target."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.subject",
          "display": "subject",
          "target": [
            {
              "code": "QuestionnaireResponse.subject",
              "display": "QuestionnaireResponse.subject",
              "equivalence": "wider",
              "comment": "Element `QuestionnaireResponse.subject` is mapped to FHIR R4 element `QuestionnaireResponse.subject` as `SourceIsBroaderThanTarget`.\nThe mappings for `QuestionnaireResponse.subject` do not cover the following types based on type expansion: display, reference.\nThe standard extension `alternate-reference` has been mapped as the representation of FHIR DSTU2 element `QuestionnaireResponse.subject` with unmapped reference targets: Resource."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.author",
          "display": "author",
          "target": [
            {
              "code": "QuestionnaireResponse.author",
              "display": "QuestionnaireResponse.author",
              "equivalence": "wider",
              "comment": "Element `QuestionnaireResponse.author` is mapped to FHIR R4 element `QuestionnaireResponse.author` as `RelatedTo`.\nThe standard extension `alternate-reference` has been mapped as the representation of FHIR DSTU2 element `QuestionnaireResponse.author` with unmapped reference targets: Device, Patient, Practitioner, RelatedPerson.\nMapping a subject's answers to multiple choice options and determining what to put in the textual answer is a matter of interpretation.  Authoring by device would indicate that some portion of the questionnaire had been auto-populated."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.authored",
          "display": "authored",
          "target": [
            {
              "code": "QuestionnaireResponse.authored",
              "display": "QuestionnaireResponse.authored",
              "equivalence": "equivalent",
              "comment": "Element `QuestionnaireResponse.authored` is mapped to FHIR R4 element `QuestionnaireResponse.authored` as `Equivalent`.\nMay be different from the update time of the resource itself, because that is the status of the collection and authoring.  This element is optional to allow for systems that may not know the value, however it SHOULD be populated if possible."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.source",
          "display": "source",
          "target": [
            {
              "code": "QuestionnaireResponse.source",
              "display": "QuestionnaireResponse.source",
              "equivalence": "wider",
              "comment": "Element `QuestionnaireResponse.source` is mapped to FHIR R4 element `QuestionnaireResponse.source` as `RelatedTo`.\nThe standard extension `alternate-reference` has been mapped as the representation of FHIR DSTU2 element `QuestionnaireResponse.source` with unmapped reference targets: Patient, Practitioner, RelatedPerson.\nIf not specified, no inference can be made about who provided the data."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.encounter",
          "display": "encounter",
          "target": [
            {
              "code": "QuestionnaireResponse.encounter",
              "display": "QuestionnaireResponse.encounter",
              "equivalence": "wider",
              "comment": "Element `QuestionnaireResponse.encounter` is mapped to FHIR R4 element `QuestionnaireResponse.encounter` as `SourceIsBroaderThanTarget`.\nThe mappings for `QuestionnaireResponse.encounter` do not cover the following types based on type expansion: display, reference.\nThe standard extension `alternate-reference` has been mapped as the representation of FHIR DSTU2 element `QuestionnaireResponse.encounter` with unmapped reference targets: Encounter."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.group",
          "display": "group",
          "target": [
            {
              "code": "QuestionnaireResponse.item",
              "display": "QuestionnaireResponse.item",
              "equivalence": "relatedto",
              "comment": "Element `QuestionnaireResponse.group` is mapped to FHIR R4 element `QuestionnaireResponse.item` as `SourceIsNarrowerThanTarget`.\nThe Questionnaire itself has one \"root\" group with the actual contents of the Questionnaire."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.group.linkId",
          "display": "linkId",
          "target": [
            {
              "code": "QuestionnaireResponse.item.linkId",
              "display": "QuestionnaireResponse.item.linkId",
              "equivalence": "equivalent",
              "comment": "Element `QuestionnaireResponse.group.linkId` is mapped to FHIR R4 element `QuestionnaireResponse.item.linkId` as `Equivalent`."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.group.text",
          "display": "text",
          "target": [
            {
              "code": "QuestionnaireResponse.item.text",
              "display": "QuestionnaireResponse.item.text",
              "equivalence": "equivalent",
              "comment": "Element `QuestionnaireResponse.group.text` is mapped to FHIR R4 element `QuestionnaireResponse.item.text` as `Equivalent`."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.group.subject",
          "display": "subject",
          "target": [
            {
              "code": "QuestionnaireResponse.item.text",
              "display": "QuestionnaireResponse.item.text",
              "equivalence": "relatedto",
              "comment": "Element `QuestionnaireResponse.group.subject` is mapped to FHIR R4 element `QuestionnaireResponse.item.text` as `SourceIsBroaderThanTarget`."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.group.group",
          "display": "group",
          "target": [
            {
              "code": "QuestionnaireResponse.item.item",
              "display": "QuestionnaireResponse.item.item",
              "equivalence": "equivalent",
              "comment": "Element `QuestionnaireResponse.group.group` is mapped to FHIR R4 element `QuestionnaireResponse.item.item` as `Equivalent`."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.group.question",
          "display": "question",
          "target": [
            {
              "code": "QuestionnaireResponse.item",
              "display": "QuestionnaireResponse.item",
              "equivalence": "relatedto",
              "comment": "Element `QuestionnaireResponse.group.question` is mapped to FHIR R4 element `QuestionnaireResponse.item` as `Equivalent`.\nElement `QuestionnaireResponse.group.question` is mapped to FHIR R4 element `QuestionnaireResponse.item.item` as `Equivalent`."
            },
            {
              "code": "QuestionnaireResponse.item.item",
              "display": "QuestionnaireResponse.item.item",
              "equivalence": "relatedto",
              "comment": "Element `QuestionnaireResponse.group.question` is mapped to FHIR R4 element `QuestionnaireResponse.item` as `Equivalent`.\nElement `QuestionnaireResponse.group.question` is mapped to FHIR R4 element `QuestionnaireResponse.item.item` as `Equivalent`."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.group.question.linkId",
          "display": "linkId",
          "target": [
            {
              "code": "QuestionnaireResponse.item.linkId",
              "display": "QuestionnaireResponse.item.linkId",
              "equivalence": "equivalent",
              "comment": "Element `QuestionnaireResponse.group.question.linkId` is mapped to FHIR R4 element `QuestionnaireResponse.item.linkId` as `Equivalent`."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.group.question.text",
          "display": "text",
          "target": [
            {
              "code": "QuestionnaireResponse.item.text",
              "display": "QuestionnaireResponse.item.text",
              "equivalence": "equivalent",
              "comment": "Element `QuestionnaireResponse.group.question.text` is mapped to FHIR R4 element `QuestionnaireResponse.item.text` as `Equivalent`."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.group.question.answer",
          "display": "answer",
          "target": [
            {
              "code": "QuestionnaireResponse.item.answer",
              "display": "QuestionnaireResponse.item.answer",
              "equivalence": "wider",
              "comment": "Element `QuestionnaireResponse.group.question.answer` is mapped to FHIR R4 element `QuestionnaireResponse.item.answer` as `Equivalent`.\nThe value is nested because we cannot have a repeating structure that has variable type."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.group.question.answer.value[x]",
          "display": "value[x]",
          "target": [
            {
              "code": "QuestionnaireResponse.item.answer.value[x]",
              "display": "QuestionnaireResponse.item.answer.value[x]",
              "equivalence": "relatedto",
              "comment": "Element `QuestionnaireResponse.group.question.answer.value[x]` is mapped to FHIR R4 element `QuestionnaireResponse.item.answer.value[x]` as `RelatedTo`.\nThe mappings for `QuestionnaireResponse.group.question.answer.value[x]` do not cover the following types: Attachment, instant.\nThe target context `QuestionnaireResponse.item.answer.value[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `QuestionnaireResponse.item.answer`.\nThe standard extension `alternate-reference` has been mapped as PART of the representation of FHIR DSTU2 element `QuestionnaireResponse.group.question.answer.value[x]` with unmapped reference targets: Resource.\nSource element `QuestionnaireResponse.group.question.answer.value[x]` has unmapped reference types. While the target element `QuestionnaireResponse.item.answer.value[x]` is a choice type and does not allow extensions, the `alternate-reference` extension can be applied to Reference values within it.\nMore complex structures (Attachment, Resource and Quantity) will typically be limited to electronic forms that can expose an appropriate user interface to capture the components and enforce the constraints of a complex data type.  Additional complex types can be introduced through extensions."
            }
          ]
        },
        {
          "code": "QuestionnaireResponse.group.question.answer.group",
          "display": "group",
          "target": [
            {
              "code": "QuestionnaireResponse.item.item",
              "display": "QuestionnaireResponse.item.item",
              "equivalence": "equivalent",
              "comment": "Element `QuestionnaireResponse.group.question.answer.group` is mapped to FHIR R4 element `QuestionnaireResponse.item.item` as `Equivalent`."
            }
          ]
        }
      ]
    },
    {
      "source": "http://hl7.org/fhir/StructureDefinition/QuestionnaireResponse",
      "sourceVersion": "1.0.2",
      "target": "http://hl7.org/fhir/1.0/StructureDefinition/extension-QuestionnaireResponse.meta",
      "targetVersion": "0.1.0",
      "element": [
        {
          "code": "QuestionnaireResponse.meta",
          "display": "meta",
          "target": [
            {
              "code": "Extension",
              "equivalence": "equivalent",
              "comment": "Element `QuestionnaireResponse.meta` is mapped to FHIR R4 element `QuestionnaireResponse.meta` as `SourceIsBroaderThanTarget`.\nThe mappings for `QuestionnaireResponse.meta` do not cover the following types: Meta.\nThe mappings for `QuestionnaireResponse.meta` do not cover the following types based on type expansion: lastUpdated, profile, security, tag, versionId."
            }
          ]
        }
      ]
    },
    {
      "source": "http://hl7.org/fhir/StructureDefinition/QuestionnaireResponse",
      "sourceVersion": "1.0.2",
      "target": "http://hl7.org/fhir/1.0/StructureDefinition/extension-QuestionnaireResponse.text",
      "targetVersion": "0.1.0",
      "element": [
        {
          "code": "QuestionnaireResponse.text",
          "display": "text",
          "target": [
            {
              "code": "Extension",
              "equivalence": "equivalent",
              "comment": "Element `QuestionnaireResponse.text` is mapped to FHIR R4 element `QuestionnaireResponse.text` as `SourceIsBroaderThanTarget`.\nThe mappings for `QuestionnaireResponse.text` do not cover the following types: Narrative.\nThe mappings for `QuestionnaireResponse.text` do not cover the following types based on type expansion: div, status.\nContained resources do not have narrative. Resources that are not contained SHOULD have a narrative."
            }
          ]
        }
      ]
    },
    {
      "source": "http://hl7.org/fhir/StructureDefinition/QuestionnaireResponse",
      "sourceVersion": "1.0.2",
      "target": "http://hl7.org/fhir/1.0/StructureDefinition/extension-QuestionnaireResponse.identifier",
      "targetVersion": "0.1.0",
      "element": [
        {
          "code": "QuestionnaireResponse.identifier",
          "display": "identifier",
          "target": [
            {
              "code": "Extension",
              "equivalence": "equivalent",
              "comment": "Element `QuestionnaireResponse.identifier` is mapped to FHIR R4 element `QuestionnaireResponse.identifier` as `SourceIsBroaderThanTarget`.\nThe mappings for `QuestionnaireResponse.identifier` do not cover the following types: Identifier.\nThe mappings for `QuestionnaireResponse.identifier` do not cover the following types based on type expansion: assigner, period, system, type, use, value."
            }
          ]
        }
      ]
    },
    {
      "source": "http://hl7.org/fhir/StructureDefinition/QuestionnaireResponse",
      "sourceVersion": "1.0.2",
      "target": "http://hl7.org/fhir/1.0/StructureDefinition/extension-QuestionnaireResponse.questionnaire",
      "targetVersion": "0.1.0",
      "element": [
        {
          "code": "QuestionnaireResponse.questionnaire",
          "display": "questionnaire",
          "target": [
            {
              "code": "Extension",
              "equivalence": "equivalent",
              "comment": "Element `QuestionnaireResponse.questionnaire` is mapped to FHIR R4 element `QuestionnaireResponse.questionnaire` as `SourceIsBroaderThanTarget`.\nThe mappings for `QuestionnaireResponse.questionnaire` do not cover the following types: Reference.\nThe mappings for `QuestionnaireResponse.questionnaire` do not cover the following types based on type expansion: display, reference."
            }
          ]
        }
      ]
    },
    {
      "source": "http://hl7.org/fhir/StructureDefinition/QuestionnaireResponse",
      "sourceVersion": "1.0.2",
      "target": "http://hl7.org/fhir/1.0/StructureDefinition/extension-QuestionnaireResponse.group.title",
      "targetVersion": "0.1.0",
      "element": [
        {
          "code": "QuestionnaireResponse.group.title",
          "display": "title",
          "target": [
            {
              "code": "Extension",
              "equivalence": "equivalent",
              "comment": "Element `QuestionnaireResponse.group.title` has a context of QuestionnaireResponse.item based on following the parent source element upwards and mapping to `QuestionnaireResponse`.\nElement `QuestionnaireResponse.group.title` has no mapping targets in FHIR R4. Typically, this is because the element has been added (is a new element).\nOn the root group, this is the title of the questionnaire."
            }
          ]
        }
      ]
    },
    {
      "source": "http://hl7.org/fhir/StructureDefinition/QuestionnaireResponse",
      "sourceVersion": "1.0.2",
      "target": "http://hl7.org/fhir/1.0/StructureDefinition/extension-QuestionnaireResponse.group.question.answer.value",
      "targetVersion": "0.1.0",
      "element": [
        {
          "code": "QuestionnaireResponse.group.question.answer.value[x]",
          "display": "value[x]",
          "target": [
            {
              "code": "Extension",
              "equivalence": "wider",
              "comment": "Element `QuestionnaireResponse.group.question.answer.value[x]` is mapped to FHIR R4 element `QuestionnaireResponse.item.answer.value[x]` as `RelatedTo`.\nThe mappings for `QuestionnaireResponse.group.question.answer.value[x]` do not cover the following types: Attachment, instant.\nThe target context `QuestionnaireResponse.item.answer.value[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `QuestionnaireResponse.item.answer`.\nThe standard extension `alternate-reference` has been mapped as PART of the representation of FHIR DSTU2 element `QuestionnaireResponse.group.question.answer.value[x]` with unmapped reference targets: Resource.\nSource element `QuestionnaireResponse.group.question.answer.value[x]` has unmapped reference types. While the target element `QuestionnaireResponse.item.answer.value[x]` is a choice type and does not allow extensions, the `alternate-reference` extension can be applied to Reference values within it.\nMore complex structures (Attachment, Resource and Quantity) will typically be limited to electronic forms that can expose an appropriate user interface to capture the components and enforce the constraints of a complex data type.  Additional complex types can be introduced through extensions."
            }
          ]
        }
      ]
    },
    {
      "source": "http://hl7.org/fhir/StructureDefinition/QuestionnaireResponse",
      "sourceVersion": "1.0.2",
      "target": "http://hl7.org/fhir/StructureDefinition/alternate-reference",
      "targetVersion": "5.2.0",
      "element": [
        {
          "code": "QuestionnaireResponse.group.question.answer.value[x]",
          "display": "value[x]",
          "target": [
            {
              "code": "Extension",
              "equivalence": "wider",
              "comment": "Element `QuestionnaireResponse.group.question.answer.value[x]` is mapped to FHIR R4 element `QuestionnaireResponse.item.answer.value[x]` as `RelatedTo`.\nThe mappings for `QuestionnaireResponse.group.question.answer.value[x]` do not cover the following types: Attachment, instant.\nThe target context `QuestionnaireResponse.item.answer.value[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `QuestionnaireResponse.item.answer`.\nThe standard extension `alternate-reference` has been mapped as PART of the representation of FHIR DSTU2 element `QuestionnaireResponse.group.question.answer.value[x]` with unmapped reference targets: Resource.\nSource element `QuestionnaireResponse.group.question.answer.value[x]` has unmapped reference types. While the target element `QuestionnaireResponse.item.answer.value[x]` is a choice type and does not allow extensions, the `alternate-reference` extension can be applied to Reference values within it.\nMore complex structures (Attachment, Resource and Quantity) will typically be limited to electronic forms that can expose an appropriate user interface to capture the components and enforce the constraints of a complex data type.  Additional complex types can be introduced through extensions."
            }
          ]
        }
      ]
    }
  ]
}