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Packagehl7.fhir.uv.xver-r4b.r3
Resource TypeStructureDefinition
IdStructureDefinition-ext-R4B-SubstanceDefinition.property.json
FHIR VersionR3
Sourcehttp://hl7.org/fhir/uv/xver-r4b.r3/0.1.0/StructureDefinition-ext-R4B-SubstanceDefinition.property.html
URLhttp://hl7.org/fhir/4.3/StructureDefinition/extension-SubstanceDefinition.property
Version0.1.0
Statusactive
Date2026-03-17T21:02:03.8104715+00:00
NameExtensionSubstanceDefinition_Property
TitleR4B: General specifications for this substance (new)
Realmuv
Authorityhl7
DescriptionR4B: `SubstanceDefinition.property` (new:BackboneElement)
PurposeThis extension is part of the cross-version definitions generated to enable use of the element `SubstanceDefinition.property` as defined in FHIR R4B in FHIR STU3. The source element is defined as: `SubstanceDefinition.property` 0..* `BackboneElement` Across FHIR versions, the element set has been mapped as: * R4B: `SubstanceDefinition.property` 0..* `BackboneElement` Following are the generation technical comments: Element `SubstanceDefinition.property` is not mapped to FHIR STU3, since FHIR R4B `SubstanceDefinition` is not mapped. Element `SubstanceDefinition.property` has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element).
TypeExtension
Kindcomplex-type

Resources that use this resource

ConceptMap
hl7.fhir.uv.xver-r4b.r3#0.1.0R4B-SubstanceDefinition-element-map-to-R3Cross-version mapping for FHIR R4B SubstanceDefinition to FHIR STU3 Basic

Resources that this resource uses

No resources found


Examples of Use for Extension

No extension usage examples found


Narrative

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

Generated Narrative: StructureDefinition ext-R4B-SubstanceDefinition.property

NameFlagsCard.TypeDescription & Constraintsdoco
.. Extension 0..*ExtensionR4B: General specifications for this substance (new)
... Slices for extension 1..*ExtensionExtension
Slice: Unordered, Open by value:url
.... extension:type 1..1ExtensionR4B: A code expressing the type of property (new)
..... url 1..1uri"type"
..... value[x] 1..1CodeableConceptA code expressing the type of property
.... extension:value 0..1ExtensionR4B: A value for the property (new)
..... url 1..1uri"value"
..... value[x] 0..1A value for the property
...... valueCodeableConceptCodeableConcept
...... valueQuantityQuantity
...... valueDatedate
...... valueBooleanboolean
...... valueAttachmentAttachment
... url 1..1uri"http://hl7.org/fhir/4.3/StructureDefinition/extension-SubstanceDefinition.property"
... value[x] 0..0Value of extension

doco Documentation for this format

Source1

{
  "resourceType": "StructureDefinition",
  "id": "ext-R4B-SubstanceDefinition.property",
  "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-r4b.r3"
        },
        {
          "url": "version",
          "valueString": "0.1.0"
        },
        {
          "url": "uri",
          "valueUri": "http://hl7.org/fhir/uv/xver/ImplementationGuide/hl7.fhir.uv.xver-r4b.r3"
        }
      ],
      "url": "http://hl7.org/fhir/StructureDefinition/package-source"
    },
    {
      "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-r4b.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-r4b.r3"
          }
        ]
      }
    }
  ],
  "url": "http://hl7.org/fhir/4.3/StructureDefinition/extension-SubstanceDefinition.property",
  "version": "0.1.0",
  "name": "ExtensionSubstanceDefinition_Property",
  "title": "R4B: General specifications for this substance (new)",
  "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": "R4B: `SubstanceDefinition.property` (new:BackboneElement)",
  "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 `SubstanceDefinition.property` as defined in FHIR R4B\r\nin FHIR STU3.\r\n\r\nThe source element is defined as:\r\n`SubstanceDefinition.property` 0..* `BackboneElement`\r\n\r\nAcross FHIR versions, the element set has been mapped as:\r\n*  R4B: `SubstanceDefinition.property` 0..* `BackboneElement`\r\n\r\nFollowing are the generation technical comments:\r\nElement `SubstanceDefinition.property` is not mapped to FHIR STU3, since FHIR R4B `SubstanceDefinition` is not mapped.\nElement `SubstanceDefinition.property` has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element).",
  "fhirVersion": "3.0.2",
  "mapping": [
    {
      "identity": "rim",
      "uri": "http://hl7.org/v3",
      "name": "RIM Mapping"
    }
  ],
  "kind": "complex-type",
  "abstract": false,
  "contextType": "resource",
  "context": [
    "Basic"
  ],
  "type": "Extension",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation": "constraint",
  "snapshot": {
    "element": [
      {
        "id": "Extension",
        "path": "Extension",
        "short": "R4B: General specifications for this substance (new)",
        "definition": "R4B: `SubstanceDefinition.property` (new:BackboneElement)",
        "comment": "Element `SubstanceDefinition.property` is not mapped to FHIR STU3, since FHIR R4B `SubstanceDefinition` is not mapped.\nElement `SubstanceDefinition.property` has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element).",
        "min": 0,
        "max": "*",
        "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",
            "expression": "hasValue() | (children().count() > id.count())",
            "xpath": "@value|f:*|h:div",
            "source": "http://hl7.org/fhir/StructureDefinition/Element"
          },
          {
            "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"
          }
        ],
        "isModifier": false
      },
      {
        "id": "Extension.id",
        "path": "Extension.id",
        "representation": [
          "xmlAttr"
        ],
        "short": "xml:id (or equivalent in JSON)",
        "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": [
          {
            "code": "string"
          }
        ],
        "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",
          "ordered": false,
          "rules": "open"
        },
        "short": "Extension",
        "definition": "An Extension",
        "min": 1,
        "max": "*",
        "base": {
          "path": "Element.extension",
          "min": 0,
          "max": "*"
        },
        "type": [
          {
            "code": "Extension"
          }
        ]
      },
      {
        "id": "Extension.extension:type",
        "path": "Extension.extension",
        "sliceName": "type",
        "short": "R4B: A code expressing the type of property (new)",
        "definition": "R4B: `SubstanceDefinition.property.type` (new:CodeableConcept)",
        "comment": "Element `SubstanceDefinition.property.type` is part of an existing definition because parent element `SubstanceDefinition.property` requires a cross-version extension.\nElement `SubstanceDefinition.property.type` is not mapped to FHIR STU3, since FHIR R4B `SubstanceDefinition` is not mapped.\nElement `SubstanceDefinition.property.type` has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element).",
        "requirements": "Element `SubstanceDefinition.property.type` is part of an existing definition because parent element `SubstanceDefinition.property` requires a cross-version extension.\nElement `SubstanceDefinition.property.type` is not mapped to FHIR STU3, since FHIR R4B `SubstanceDefinition` is not mapped.\nElement `SubstanceDefinition.property.type` has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element).",
        "min": 1,
        "max": "1",
        "base": {
          "path": "Element.extension",
          "min": 0,
          "max": "*"
        },
        "type": [
          {
            "code": "Extension"
          }
        ]
      },
      {
        "id": "Extension.extension:type.id",
        "path": "Extension.extension.id",
        "representation": [
          "xmlAttr"
        ],
        "short": "xml:id (or equivalent in JSON)",
        "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": [
          {
            "code": "string"
          }
        ],
        "mapping": [
          {
            "identity": "rim",
            "map": "n/a"
          }
        ]
      },
      {
        "id": "Extension.extension:type.extension",
        "path": "Extension.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. 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.",
        "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"
          }
        ],
        "mapping": [
          {
            "identity": "rim",
            "map": "n/a"
          }
        ]
      },
      {
        "id": "Extension.extension:type.url",
        "path": "Extension.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": [
          {
            "code": "uri"
          }
        ],
        "fixedUri": "type",
        "mapping": [
          {
            "identity": "rim",
            "map": "N/A"
          }
        ]
      },
      {
        "id": "Extension.extension:type.value[x]",
        "path": "Extension.extension.value[x]",
        "short": "A code expressing the type of property",
        "definition": "A code expressing the type of property.",
        "min": 1,
        "max": "1",
        "base": {
          "path": "Extension.value[x]",
          "min": 0,
          "max": "1"
        },
        "type": [
          {
            "code": "CodeableConcept"
          }
        ],
        "mapping": [
          {
            "identity": "rim",
            "map": "N/A"
          }
        ]
      },
      {
        "id": "Extension.extension:value",
        "path": "Extension.extension",
        "sliceName": "value",
        "short": "R4B: A value for the property (new)",
        "definition": "R4B: `SubstanceDefinition.property.value[x]` (new:Attachment, boolean, CodeableConcept, date, Quantity)",
        "comment": "Element `SubstanceDefinition.property.value[x]` is part of an existing definition because parent element `SubstanceDefinition.property` requires a cross-version extension.\nElement `SubstanceDefinition.property.value[x]` is not mapped to FHIR STU3, since FHIR R4B `SubstanceDefinition` is not mapped.\nElement `SubstanceDefinition.property.value[x]` has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element).",
        "requirements": "Element `SubstanceDefinition.property.value[x]` is part of an existing definition because parent element `SubstanceDefinition.property` requires a cross-version extension.\nElement `SubstanceDefinition.property.value[x]` is not mapped to FHIR STU3, since FHIR R4B `SubstanceDefinition` is not mapped.\nElement `SubstanceDefinition.property.value[x]` has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element).",
        "min": 0,
        "max": "1",
        "base": {
          "path": "Element.extension",
          "min": 0,
          "max": "*"
        },
        "type": [
          {
            "code": "Extension"
          }
        ]
      },
      {
        "id": "Extension.extension:value.id",
        "path": "Extension.extension.id",
        "representation": [
          "xmlAttr"
        ],
        "short": "xml:id (or equivalent in JSON)",
        "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": [
          {
            "code": "string"
          }
        ],
        "mapping": [
          {
            "identity": "rim",
            "map": "n/a"
          }
        ]
      },
      {
        "id": "Extension.extension:value.extension",
        "path": "Extension.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. 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.",
        "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"
          }
        ],
        "mapping": [
          {
            "identity": "rim",
            "map": "n/a"
          }
        ]
      },
      {
        "id": "Extension.extension:value.url",
        "path": "Extension.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": [
          {
            "code": "uri"
          }
        ],
        "fixedUri": "value",
        "mapping": [
          {
            "identity": "rim",
            "map": "N/A"
          }
        ]
      },
      {
        "id": "Extension.extension:value.value[x]",
        "path": "Extension.extension.value[x]",
        "short": "A value for the property",
        "definition": "A value for the property.",
        "min": 0,
        "max": "1",
        "base": {
          "path": "Extension.value[x]",
          "min": 0,
          "max": "1"
        },
        "type": [
          {
            "code": "CodeableConcept"
          },
          {
            "code": "Quantity"
          },
          {
            "code": "date"
          },
          {
            "code": "boolean"
          },
          {
            "code": "Attachment"
          }
        ],
        "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": [
          {
            "code": "uri"
          }
        ],
        "fixedUri": "http://hl7.org/fhir/4.3/StructureDefinition/extension-SubstanceDefinition.property",
        "mapping": [
          {
            "identity": "rim",
            "map": "N/A"
          }
        ]
      },
      {
        "id": "Extension.value[x]",
        "path": "Extension.value[x]",
        "short": "Value of extension",
        "definition": "Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list).",
        "min": 0,
        "max": "0",
        "base": {
          "path": "Extension.value[x]",
          "min": 0,
          "max": "1"
        },
        "type": [
          {
            "code": "base64Binary"
          },
          {
            "code": "boolean"
          },
          {
            "code": "code"
          },
          {
            "code": "date"
          },
          {
            "code": "dateTime"
          },
          {
            "code": "decimal"
          },
          {
            "code": "id"
          },
          {
            "code": "instant"
          },
          {
            "code": "integer"
          },
          {
            "code": "markdown"
          },
          {
            "code": "oid"
          },
          {
            "code": "positiveInt"
          },
          {
            "code": "string"
          },
          {
            "code": "time"
          },
          {
            "code": "unsignedInt"
          },
          {
            "code": "uri"
          },
          {
            "code": "Address"
          },
          {
            "code": "Age"
          },
          {
            "code": "Annotation"
          },
          {
            "code": "Attachment"
          },
          {
            "code": "CodeableConcept"
          },
          {
            "code": "Coding"
          },
          {
            "code": "ContactPoint"
          },
          {
            "code": "Count"
          },
          {
            "code": "Distance"
          },
          {
            "code": "Duration"
          },
          {
            "code": "HumanName"
          },
          {
            "code": "Identifier"
          },
          {
            "code": "Money"
          },
          {
            "code": "Period"
          },
          {
            "code": "Quantity"
          },
          {
            "code": "Range"
          },
          {
            "code": "Ratio"
          },
          {
            "code": "Reference"
          },
          {
            "code": "SampledData"
          },
          {
            "code": "Signature"
          },
          {
            "code": "Timing"
          },
          {
            "code": "Meta"
          }
        ],
        "mapping": [
          {
            "identity": "rim",
            "map": "N/A"
          }
        ]
      }
    ]
  },
  "differential": {
    "element": [
      {
        "id": "Extension",
        "path": "Extension",
        "short": "R4B: General specifications for this substance (new)",
        "definition": "R4B: `SubstanceDefinition.property` (new:BackboneElement)",
        "comment": "Element `SubstanceDefinition.property` is not mapped to FHIR STU3, since FHIR R4B `SubstanceDefinition` is not mapped.\nElement `SubstanceDefinition.property` has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element).",
        "min": 0,
        "max": "*",
        "base": {
          "path": "Extension",
          "min": 0,
          "max": "*"
        },
        "isModifier": false
      },
      {
        "id": "Extension.extension",
        "path": "Extension.extension",
        "slicing": {
          "discriminator": [
            {
              "type": "value",
              "path": "url"
            }
          ],
          "ordered": false,
          "rules": "open"
        },
        "min": 1,
        "max": "*",
        "base": {
          "path": "Extension.extension",
          "min": 0,
          "max": "*"
        }
      },
      {
        "id": "Extension.extension:type",
        "path": "Extension.extension",
        "sliceName": "type",
        "short": "R4B: A code expressing the type of property (new)",
        "definition": "R4B: `SubstanceDefinition.property.type` (new:CodeableConcept)",
        "comment": "Element `SubstanceDefinition.property.type` is part of an existing definition because parent element `SubstanceDefinition.property` requires a cross-version extension.\nElement `SubstanceDefinition.property.type` is not mapped to FHIR STU3, since FHIR R4B `SubstanceDefinition` is not mapped.\nElement `SubstanceDefinition.property.type` has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element).",
        "requirements": "Element `SubstanceDefinition.property.type` is part of an existing definition because parent element `SubstanceDefinition.property` requires a cross-version extension.\nElement `SubstanceDefinition.property.type` is not mapped to FHIR STU3, since FHIR R4B `SubstanceDefinition` is not mapped.\nElement `SubstanceDefinition.property.type` has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element).",
        "min": 1,
        "max": "1",
        "base": {
          "path": "Extension.extension",
          "min": 0,
          "max": "*"
        }
      },
      {
        "id": "Extension.extension:type.url",
        "path": "Extension.extension.url",
        "min": 1,
        "max": "1",
        "base": {
          "path": "Extension.url",
          "min": 1,
          "max": "1"
        },
        "fixedUri": "type"
      },
      {
        "id": "Extension.extension:type.value[x]",
        "path": "Extension.extension.value[x]",
        "short": "A code expressing the type of property",
        "definition": "A code expressing the type of property.",
        "min": 1,
        "max": "1",
        "base": {
          "path": "Extension.value[x]",
          "min": 0,
          "max": "1"
        },
        "type": [
          {
            "code": "CodeableConcept"
          }
        ]
      },
      {
        "id": "Extension.extension:value",
        "path": "Extension.extension",
        "sliceName": "value",
        "short": "R4B: A value for the property (new)",
        "definition": "R4B: `SubstanceDefinition.property.value[x]` (new:Attachment, boolean, CodeableConcept, date, Quantity)",
        "comment": "Element `SubstanceDefinition.property.value[x]` is part of an existing definition because parent element `SubstanceDefinition.property` requires a cross-version extension.\nElement `SubstanceDefinition.property.value[x]` is not mapped to FHIR STU3, since FHIR R4B `SubstanceDefinition` is not mapped.\nElement `SubstanceDefinition.property.value[x]` has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element).",
        "requirements": "Element `SubstanceDefinition.property.value[x]` is part of an existing definition because parent element `SubstanceDefinition.property` requires a cross-version extension.\nElement `SubstanceDefinition.property.value[x]` is not mapped to FHIR STU3, since FHIR R4B `SubstanceDefinition` is not mapped.\nElement `SubstanceDefinition.property.value[x]` has no mapping targets in FHIR STU3. Typically, this is because the element has been added (is a new element).",
        "min": 0,
        "max": "1",
        "base": {
          "path": "Extension.extension",
          "min": 0,
          "max": "*"
        }
      },
      {
        "id": "Extension.extension:value.url",
        "path": "Extension.extension.url",
        "min": 1,
        "max": "1",
        "base": {
          "path": "Extension.url",
          "min": 1,
          "max": "1"
        },
        "fixedUri": "value"
      },
      {
        "id": "Extension.extension:value.value[x]",
        "path": "Extension.extension.value[x]",
        "short": "A value for the property",
        "definition": "A value for the property.",
        "min": 0,
        "max": "1",
        "base": {
          "path": "Extension.value[x]",
          "min": 0,
          "max": "1"
        },
        "type": [
          {
            "code": "CodeableConcept"
          },
          {
            "code": "Quantity"
          },
          {
            "code": "date"
          },
          {
            "code": "boolean"
          },
          {
            "code": "Attachment"
          }
        ]
      },
      {
        "id": "Extension.url",
        "path": "Extension.url",
        "min": 1,
        "max": "1",
        "base": {
          "path": "Extension.url",
          "min": 1,
          "max": "1"
        },
        "fixedUri": "http://hl7.org/fhir/4.3/StructureDefinition/extension-SubstanceDefinition.property"
      },
      {
        "id": "Extension.value[x]",
        "path": "Extension.value[x]",
        "min": 0,
        "max": "0",
        "base": {
          "path": "Extension.value[x]",
          "min": 0,
          "max": "1"
        }
      }
    ]
  }
}