{
  "description": "R4: `Task.reasonReference` (new:Reference(Resource))",
  "_filename": "StructureDefinition-ext-R4-Task.reasonReference.json",
  "package_name": "hl7.fhir.uv.xver-r4.r3",
  "date": "2026-03-17T21:02:03.8104715+00:00",
  "derivation": "constraint",
  "publisher": "FHIR Infrastructure",
  "fhirVersion": "3.0.2",
  "jurisdiction": [ {
    "coding": [ {
      "code": "001",
      "system": "http://unstats.un.org/unsd/methods/m49/m49.htm",
      "display": "World"
    } ]
  } ],
  "purpose": "This extension is part of the cross-version definitions generated to enable use of the\r\nelement `Task.reasonReference` as defined in FHIR R4\r\nin FHIR STU3.\r\n\r\nThe source element is defined as:\r\n`Task.reasonReference` 0..1 `Reference(http://hl7.org/fhir/StructureDefinition/Resource)`\r\n\r\nFollowing are the generation technical comments:\r\nElement `Task.reasonReference` has a context of ProcessRequest based on following the parent source element upwards and mapping to `ProcessRequest`.\nElement `Task.reasonReference` has a context of ProcessResponse based on following the parent source element upwards and mapping to `ProcessResponse`.\nElement `Task.reasonReference` has a context of Task based on following the parent source element upwards and mapping to `Task`.\nElement `Task.reasonReference` has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element).",
  "name": "ExtensionTask_ReasonReference",
  "mapping": [ {
    "uri": "http://hl7.org/v3",
    "name": "RIM Mapping",
    "identity": "rim"
  } ],
  "abstract": false,
  "type": "Extension",
  "experimental": "false",
  "resourceType": "StructureDefinition",
  "title": "R4: Why task is needed (new)",
  "package_version": "0.1.0",
  "extension": [ {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode": "fhir"
  }, {
    "url": "http://hl7.org/fhir/StructureDefinition/package-source",
    "extension": [ {
      "url": "packageId",
      "valueId": "hl7.fhir.uv.xver-r4.r3"
    }, {
      "url": "version",
      "valueString": "0.1.0"
    }, {
      "url": "uri",
      "valueUri": "http://hl7.org/fhir/uv/xver/ImplementationGuide/hl7.fhir.uv.xver-r4.r3"
    } ]
  }, {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
    "valueInteger": 0,
    "_valueInteger": {
      "extension": [ {
        "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
        "valueUri": "http://hl7.org/fhir/uv/xver/ImplementationGuide/hl7.fhir.uv.xver-r4.r3"
      } ]
    }
  }, {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
    "valueCode": "trial-use",
    "_valueCode": {
      "extension": [ {
        "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
        "valueUri": "http://hl7.org/fhir/uv/xver/ImplementationGuide/hl7.fhir.uv.xver-r4.r3"
      } ]
    }
  } ],
  "snapshot": {
    "element": [ {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() | (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
      } ],
      "path": "Extension",
      "min": 0,
      "definition": "R4: `Task.reasonReference` (new:Reference(Resource))",
      "isModifier": false,
      "short": "R4: Why task is needed (new)",
      "max": "1",
      "id": "Extension",
      "condition": [ "ele-1" ],
      "comment": "Element `Task.reasonReference` has a context of ProcessRequest based on following the parent source element upwards and mapping to `ProcessRequest`.\nElement `Task.reasonReference` has a context of ProcessResponse based on following the parent source element upwards and mapping to `ProcessResponse`.\nElement `Task.reasonReference` has a context of Task based on following the parent source element upwards and mapping to `Task`.\nElement `Task.reasonReference` has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element).\nTasks might be justified based on an Observation, a Condition, a past or planned procedure, etc.   This should only be included if there is no focus or if it differs from the reason indicated on the focus.    Use the CodeableConcept text element in `Task.reasonCode` if the data is free (uncoded) text.",
      "base": {
        "max": "*",
        "min": 0,
        "path": "Extension"
      }
    }, {
      "path": "Extension.id",
      "min": 0,
      "definition": "unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
      "short": "xml:id (or equivalent in JSON)",
      "mapping": [ {
        "map": "n/a",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "string"
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "Extension.id",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Element.id"
      }
    }, {
      "path": "Extension.extension",
      "min": 0,
      "definition": "May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.",
      "short": "Additional Content defined by implementations",
      "mapping": [ {
        "map": "n/a",
        "identity": "rim"
      } ],
      "slicing": {
        "rules": "open",
        "description": "Extensions are always sliced by (at least) url",
        "discriminator": [ {
          "path": "url",
          "type": "value"
        } ]
      },
      "type": [ {
        "code": "Extension"
      } ],
      "alias": [ "extensions", "user content" ],
      "max": "*",
      "id": "Extension.extension",
      "comment": "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "base": {
        "max": "*",
        "min": 0,
        "path": "Element.extension"
      }
    }, {
      "path": "Extension.url",
      "min": 1,
      "definition": "Source of the definition for the extension code - a logical name or a URL.",
      "short": "identifies the meaning of the extension",
      "fixedUri": "http://hl7.org/fhir/4.0/StructureDefinition/extension-Task.reasonReference",
      "mapping": [ {
        "map": "N/A",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "uri"
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "Extension.url",
      "comment": "The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.",
      "base": {
        "max": "1",
        "min": 1,
        "path": "Extension.url"
      }
    }, {
      "path": "Extension.value[x]",
      "min": 0,
      "definition": "A resource reference indicating why this task needs to be performed.",
      "short": "Why task is needed",
      "mapping": [ {
        "map": "N/A",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "Reference",
        "targetProfile": "http://hl7.org/fhir/4.0/StructureDefinition/profile-Resource|0.1.0"
      }, {
        "code": "Reference",
        "targetProfile": "http://hl7.org/fhir/StructureDefinition/Resource"
      } ],
      "max": "1",
      "id": "Extension.value[x]",
      "comment": "Tasks might be justified based on an Observation, a Condition, a past or planned procedure, etc.   This should only be included if there is no focus or if it differs from the reason indicated on the focus.    Use the CodeableConcept text element in `Task.reasonCode` if the data is free (uncoded) text.",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Extension.value[x]"
      }
    } ]
  },
  "status": "active",
  "id": "5be8ff51-b0c0-4a38-9d14-3031f30388e1",
  "kind": "complex-type",
  "url": "http://hl7.org/fhir/4.0/StructureDefinition/extension-Task.reasonReference",
  "context": [ "ProcessRequest", "ProcessResponse", "Task" ],
  "version": "0.1.0",
  "differential": {
    "element": [ {
      "path": "Extension",
      "min": 0,
      "definition": "R4: `Task.reasonReference` (new:Reference(Resource))",
      "isModifier": false,
      "short": "R4: Why task is needed (new)",
      "max": "1",
      "id": "Extension",
      "comment": "Element `Task.reasonReference` has a context of ProcessRequest based on following the parent source element upwards and mapping to `ProcessRequest`.\nElement `Task.reasonReference` has a context of ProcessResponse based on following the parent source element upwards and mapping to `ProcessResponse`.\nElement `Task.reasonReference` has a context of Task based on following the parent source element upwards and mapping to `Task`.\nElement `Task.reasonReference` has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element).\nTasks might be justified based on an Observation, a Condition, a past or planned procedure, etc.   This should only be included if there is no focus or if it differs from the reason indicated on the focus.    Use the CodeableConcept text element in `Task.reasonCode` if the data is free (uncoded) text.",
      "base": {
        "max": "*",
        "min": 0,
        "path": "Extension"
      }
    }, {
      "id": "Extension.url",
      "max": "1",
      "min": 1,
      "base": {
        "max": "1",
        "min": 1,
        "path": "Extension.url"
      },
      "path": "Extension.url",
      "fixedUri": "http://hl7.org/fhir/4.0/StructureDefinition/extension-Task.reasonReference"
    }, {
      "path": "Extension.value[x]",
      "min": 0,
      "definition": "A resource reference indicating why this task needs to be performed.",
      "short": "Why task is needed",
      "type": [ {
        "code": "Reference",
        "targetProfile": "http://hl7.org/fhir/4.0/StructureDefinition/profile-Resource|0.1.0"
      }, {
        "code": "Reference",
        "targetProfile": "http://hl7.org/fhir/StructureDefinition/Resource"
      } ],
      "max": "1",
      "id": "Extension.value[x]",
      "comment": "Tasks might be justified based on an Observation, a Condition, a past or planned procedure, etc.   This should only be included if there is no focus or if it differs from the reason indicated on the focus.    Use the CodeableConcept text element in `Task.reasonCode` if the data is free (uncoded) text.",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Extension.value[x]"
      }
    } ]
  },
  "contact": [ {
    "name": "FHIR Infrastructure",
    "telecom": [ {
      "value": "http://www.hl7.org/Special/committees/fiwg",
      "system": "url"
    } ]
  } ],
  "contextType": "resource",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension"
}