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Narrative

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Generated Narrative: StructureDefinition ext-R2-StructureDefinition.constrainedType

Name	Flags	Card.	Type	Description & Constraints
Extension		0..1	Extension(4.3.0)	DSTU2: Any datatype or resource, including abstract ones additional types additional codes
url		1..1	uri	"http://hl7.org/fhir/1.0/StructureDefinition/extension-StructureDefinition.constrainedType"
value[x]		0..1	code	Any datatype or resource, including abstract ones Binding: R2DefinedTypesForR4B (0.1.0) (required): Either a resource or a data type.
Documentation for this format

Source1

{
  "resourceType": "StructureDefinition",
  "id": "ext-R2-StructureDefinition.constrainedType",
  "text": {
    "status": "extensions",
    "div": "<!-- snip (see above) -->"
  },
  "extension": [
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
      "valueCode": "fhir"
    },
    {
      "extension": [
        {
          "url": "packageId",
          "valueId": "hl7.fhir.uv.xver-r2.r4b"
        },
        {
          "url": "version",
          "valueString": "0.1.0"
        },
        {
          "url": "uri",
          "valueUri": "http://hl7.org/fhir/uv/xver/ImplementationGuide/hl7.fhir.uv.xver-r2.r4b"
        }
      ],
      "url": "http://hl7.org/fhir/StructureDefinition/package-source"
    },
    {
      "extension": [
        {
          "url": "startFhirVersion",
          "valueCode": "4.3"
        },
        {
          "url": "endFhirVersion",
          "valueCode": "4.3"
        }
      ],
      "url": "http://hl7.org/fhir/StructureDefinition/version-specific-use"
    },
    {
      "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.r4b"
          }
        ]
      }
    },
    {
      "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.r4b"
          }
        ]
      }
    }
  ],
  "url": "http://hl7.org/fhir/1.0/StructureDefinition/extension-StructureDefinition.constrainedType",
  "version": "0.1.0",
  "name": "ExtensionStructureDefinition_ConstrainedType",
  "title": "DSTU2: Any datatype or resource, including abstract ones additional types additional codes",
  "status": "active",
  "experimental": false,
  "date": "2026-03-17T21:02:03.8104715+00:00",
  "publisher": "FHIR Infrastructure",
  "contact": [
    {
      "name": "FHIR Infrastructure",
      "telecom": [
        {
          "system": "url",
          "value": "http://www.hl7.org/Special/committees/fiwg"
        }
      ]
    }
  ],
  "description": "DSTU2: `StructureDefinition.constrainedType` additional types (code) additional types from child elements (value) additional codes",
  "jurisdiction": [
    {
      "coding": [
        {
          "system": "http://unstats.un.org/unsd/methods/m49/m49.htm",
          "code": "001",
          "display": "World"
        }
      ]
    }
  ],
  "purpose": "This extension is part of the cross-version definitions generated to enable use of the\r\nelement `StructureDefinition.constrainedType` as defined in FHIR DSTU2\r\nin FHIR R4B.\r\n\r\nThe source element is defined as:\r\n`StructureDefinition.constrainedType` 0..1 `code`\r\n\r\nAcross FHIR versions, the element set has been mapped as:\r\n*  DSTU2: `StructureDefinition.constrainedType` 0..1 `code`\n*  STU3: `StructureDefinition.type` 1..1 `code`\n*  R4: `StructureDefinition.type` 1..1 `uri`\n*  R4B: `StructureDefinition.type` 1..1 `uri`\r\n\r\nFollowing are the generation technical comments:\r\nElement `StructureDefinition.constrainedType` is mapped to FHIR R4B element `StructureDefinition.type` as `RelatedTo`.\nThe mappings for `StructureDefinition.constrainedType` do not cover the following types: code.\nThe mappings for `StructureDefinition.constrainedType` do not cover the following types based on type expansion: value.\nThe mappings for `StructureDefinition.constrainedType` do not allow expression of the necessary codes, per the bindings on the source and target.",
  "fhirVersion": "4.3.0",
  "mapping": [
    {
      "identity": "rim",
      "uri": "http://hl7.org/v3",
      "name": "RIM Mapping"
    }
  ],
  "kind": "complex-type",
  "abstract": false,
  "context": [
    {
      "type": "element",
      "expression": "StructureDefinition.type"
    }
  ],
  "type": "Extension",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension|4.3.0",
  "derivation": "constraint",
  "snapshot": {
    "extension": [
      {
        "url": "http://hl7.org/fhir/tools/StructureDefinition/snapshot-base-version",
        "valueString": "4.3.0"
      }
    ],
    "element": [
      {
        "id": "Extension",
        "path": "Extension",
        "short": "DSTU2: Any datatype or resource, including abstract ones additional types additional codes",
        "definition": "DSTU2: `StructureDefinition.constrainedType` additional types (code) additional types from child elements (value) additional codes",
        "comment": "Element `StructureDefinition.constrainedType` is mapped to FHIR R4B element `StructureDefinition.type` as `RelatedTo`.\nThe mappings for `StructureDefinition.constrainedType` do not cover the following types: code.\nThe mappings for `StructureDefinition.constrainedType` do not cover the following types based on type expansion: value.\nThe mappings for `StructureDefinition.constrainedType` do not allow expression of the necessary codes, per the bindings on the source and target.\nif a constrained type is present, then there SHALL be a base resource as well. Note that the constrained type could be determined by chasing through the base references until the base definition is reached, or by looking at the path of the first element in the snapshot - if present - but providing the constrainedType directly makes for simpler tooling and indexing.",
        "min": 0,
        "max": "1",
        "base": {
          "path": "Extension",
          "min": 0,
          "max": "*"
        },
        "condition": [
          "ele-1"
        ],
        "constraint": [
          {
            "key": "ele-1",
            "severity": "error",
            "human": "All FHIR elements must have a @value or children unless an empty Parameters resource",
            "expression": "hasValue() or (children().count() > id.count()) or $this is Parameters",
            "xpath": "@value|f:*|h:div|self::f:Parameters",
            "source": "http://hl7.org/fhir/StructureDefinition/Element|4.3.0"
          },
          {
            "key": "ext-1",
            "severity": "error",
            "human": "Must have either extensions or value[x], not both",
            "expression": "extension.exists() != value.exists()",
            "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])",
            "source": "http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"
          }
        ],
        "isModifier": false
      },
      {
        "id": "Extension.id",
        "path": "Extension.id",
        "representation": [
          "xmlAttr"
        ],
        "short": "Unique id for inter-element referencing",
        "definition": "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
        "min": 0,
        "max": "1",
        "base": {
          "path": "Element.id",
          "min": 0,
          "max": "1"
        },
        "type": [
          {
            "extension": [
              {
                "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
                "valueUrl": "id"
              }
            ],
            "code": "http://hl7.org/fhirpath/System.String"
          }
        ],
        "isModifier": false,
        "isSummary": false,
        "mapping": [
          {
            "identity": "rim",
            "map": "n/a"
          }
        ]
      },
      {
        "id": "Extension.extension",
        "path": "Extension.extension",
        "slicing": {
          "discriminator": [
            {
              "type": "value",
              "path": "url"
            }
          ],
          "description": "Extensions are always sliced by (at least) url",
          "rules": "open"
        },
        "short": "Additional content defined by implementations",
        "definition": "May be used to represent additional information that is not part of the basic definition of the element. 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 can define an extension, there is a set of requirements that SHALL be met as part of the definition of the 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.",
        "alias": [
          "extensions",
          "user content"
        ],
        "min": 0,
        "max": "*",
        "base": {
          "path": "Element.extension",
          "min": 0,
          "max": "*"
        },
        "type": [
          {
            "code": "Extension"
          }
        ],
        "constraint": [
          {
            "key": "ele-1",
            "severity": "error",
            "human": "All FHIR elements must have a @value or children",
            "expression": "hasValue() or (children().count() > id.count())",
            "xpath": "@value|f:*|h:div",
            "source": "http://hl7.org/fhir/StructureDefinition/Element|4.3.0"
          },
          {
            "key": "ext-1",
            "severity": "error",
            "human": "Must have either extensions or value[x], not both",
            "expression": "extension.exists() != value.exists()",
            "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
            "source": "http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"
          }
        ],
        "isModifier": false,
        "isSummary": false,
        "mapping": [
          {
            "identity": "rim",
            "map": "n/a"
          }
        ]
      },
      {
        "id": "Extension.url",
        "path": "Extension.url",
        "representation": [
          "xmlAttr"
        ],
        "short": "identifies the meaning of the extension",
        "definition": "Source of the definition for the extension code - a logical name or a 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.",
        "min": 1,
        "max": "1",
        "base": {
          "path": "Extension.url",
          "min": 1,
          "max": "1"
        },
        "type": [
          {
            "extension": [
              {
                "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
                "valueUrl": "uri"
              }
            ],
            "code": "http://hl7.org/fhirpath/System.String"
          }
        ],
        "fixedUri": "http://hl7.org/fhir/1.0/StructureDefinition/extension-StructureDefinition.constrainedType",
        "isModifier": false,
        "isSummary": false,
        "mapping": [
          {
            "identity": "rim",
            "map": "N/A"
          }
        ]
      },
      {
        "id": "Extension.value[x]",
        "path": "Extension.value[x]",
        "short": "Any datatype or resource, including abstract ones",
        "definition": "The type of type that is being constrained - a data type, an extension, a resource, including abstract ones. If this field is present, it indicates that the structure definition is a constraint. If it is not present, then the structure definition is the definition of a base structure.",
        "comment": "if a constrained type is present, then there SHALL be a base resource as well. Note that the constrained type could be determined by chasing through the base references until the base definition is reached, or by looking at the path of the first element in the snapshot - if present - but providing the constrainedType directly makes for simpler tooling and indexing.",
        "min": 0,
        "max": "1",
        "base": {
          "path": "Extension.value[x]",
          "min": 0,
          "max": "1"
        },
        "type": [
          {
            "code": "code"
          }
        ],
        "constraint": [
          {
            "key": "ele-1",
            "severity": "error",
            "human": "All FHIR elements must have a @value or children",
            "expression": "hasValue() or (children().count() > id.count())",
            "xpath": "@value|f:*|h:div",
            "source": "http://hl7.org/fhir/StructureDefinition/Element|4.3.0"
          }
        ],
        "isModifier": false,
        "isSummary": false,
        "binding": {
          "strength": "required",
          "description": "Either a resource or a data type.",
          "valueSet": "http://hl7.org/fhir/uv/xver/ValueSet/R2-defined-types-for-R4B|0.1.0"
        },
        "mapping": [
          {
            "identity": "rim",
            "map": "N/A"
          }
        ]
      }
    ]
  },
  "differential": {
    "element": [
      {
        "id": "Extension",
        "path": "Extension",
        "short": "DSTU2: Any datatype or resource, including abstract ones additional types additional codes",
        "definition": "DSTU2: `StructureDefinition.constrainedType` additional types (code) additional types from child elements (value) additional codes",
        "comment": "Element `StructureDefinition.constrainedType` is mapped to FHIR R4B element `StructureDefinition.type` as `RelatedTo`.\nThe mappings for `StructureDefinition.constrainedType` do not cover the following types: code.\nThe mappings for `StructureDefinition.constrainedType` do not cover the following types based on type expansion: value.\nThe mappings for `StructureDefinition.constrainedType` do not allow expression of the necessary codes, per the bindings on the source and target.\nif a constrained type is present, then there SHALL be a base resource as well. Note that the constrained type could be determined by chasing through the base references until the base definition is reached, or by looking at the path of the first element in the snapshot - if present - but providing the constrainedType directly makes for simpler tooling and indexing.",
        "min": 0,
        "max": "1",
        "base": {
          "path": "Extension",
          "min": 0,
          "max": "*"
        },
        "isModifier": false
      },
      {
        "id": "Extension.url",
        "path": "Extension.url",
        "min": 1,
        "max": "1",
        "base": {
          "path": "Extension.url",
          "min": 1,
          "max": "1"
        },
        "fixedUri": "http://hl7.org/fhir/1.0/StructureDefinition/extension-StructureDefinition.constrainedType"
      },
      {
        "id": "Extension.value[x]",
        "path": "Extension.value[x]",
        "short": "Any datatype or resource, including abstract ones",
        "definition": "The type of type that is being constrained - a data type, an extension, a resource, including abstract ones. If this field is present, it indicates that the structure definition is a constraint. If it is not present, then the structure definition is the definition of a base structure.",
        "comment": "if a constrained type is present, then there SHALL be a base resource as well. Note that the constrained type could be determined by chasing through the base references until the base definition is reached, or by looking at the path of the first element in the snapshot - if present - but providing the constrainedType directly makes for simpler tooling and indexing.",
        "min": 0,
        "max": "1",
        "base": {
          "path": "Extension.value[x]",
          "min": 0,
          "max": "1"
        },
        "type": [
          {
            "code": "code"
          }
        ],
        "binding": {
          "strength": "required",
          "description": "Either a resource or a data type.",
          "valueSet": "http://hl7.org/fhir/uv/xver/ValueSet/R2-defined-types-for-R4B|0.1.0"
        }
      }
    ]
  }
}