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{
  "resourceType": "StructureDefinition",
  "id": "canonical",
  "meta": {
    "lastUpdated": "2019-10-31T22:29:23.356+00:00"
  },
  "extension": [
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
      "valueCode": "normative"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-normative-version",
      "valueCode": "4.0.0"
    }
  ],
  "url": "http://hl7.org/fhir/StructureDefinition/canonical",
  "version": "4.0.1",
  "name": "canonical",
  "status": "active",
  "date": "2019-10-31T22:29:23+00:00",
  "publisher": "HL7 FHIR Standard",
  "contact": [
    {
      "telecom": [
        {
          "system": "url",
          "value": "http://hl7.org/fhir"
        }
      ]
    }
  ],
  "description": "Base StructureDefinition for canonical type: A URI that is a reference to a canonical URL on a FHIR resource",
  "fhirVersion": "4.0.1",
  "kind": "primitive-type",
  "abstract": false,
  "type": "canonical",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/uri",
  "derivation": "specialization",
  "snapshot": {
    "element": [
      {
        "id": "canonical",
        "path": "canonical",
        "short": "Primitive Type canonical",
        "definition": "A URI that is a reference to a canonical URL on a FHIR resource",
        "comment": "see [Canonical References](references.html#canonical)",
        "min": 0,
        "max": "*",
        "base": {
          "path": "canonical",
          "min": 0,
          "max": "*"
        },
        "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"
          }
        ],
        "isModifier": false,
        "isSummary": false
      },
      {
        "id": "canonical.id",
        "path": "canonical.id",
        "representation": [
          "xmlAttr"
        ],
        "short": "xml:id (or equivalent in JSON)",
        "definition": "unique id for the element within a resource (for internal references)",
        "min": 0,
        "max": "1",
        "base": {
          "path": "Element.id",
          "min": 0,
          "max": "1"
        },
        "type": [
          {
            "extension": [
              {
                "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
                "valueUrl": "string"
              }
            ],
            "code": "http://hl7.org/fhirpath/System.String"
          }
        ],
        "isModifier": false,
        "isSummary": false
      },
      {
        "id": "canonical.extension",
        "path": "canonical.extension",
        "short": "Additional content defined by implementations",
        "definition": "May be used to represent additional information that is not part of the basic definition of the resource. 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"
          },
          {
            "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,
        "isSummary": false
      },
      {
        "id": "canonical.value",
        "path": "canonical.value",
        "representation": [
          "xmlAttr"
        ],
        "short": "Primitive value for canonical",
        "definition": "Primitive value for canonical",
        "min": 0,
        "max": "1",
        "base": {
          "path": "uri.value",
          "min": 0,
          "max": "1"
        },
        "type": [
          {
            "extension": [
              {
                "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
                "valueUrl": "string"
              },
              {
                "url": "http://hl7.org/fhir/StructureDefinition/regex",
                "valueString": "\\S*"
              }
            ],
            "code": "http://hl7.org/fhirpath/System.String"
          }
        ],
        "isModifier": false,
        "isSummary": false
      }
    ]
  },
  "differential": {
    "element": [
      {
        "id": "canonical",
        "path": "canonical",
        "short": "Primitive Type canonical",
        "definition": "A URI that is a reference to a canonical URL on a FHIR resource",
        "comment": "see [Canonical References](references.html#canonical)",
        "min": 0,
        "max": "*"
      },
      {
        "id": "canonical.value",
        "path": "canonical.value",
        "representation": [
          "xmlAttr"
        ],
        "short": "Primitive value for canonical",
        "definition": "Primitive value for canonical",
        "min": 0,
        "max": "1",
        "type": [
          {
            "extension": [
              {
                "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
                "valueUrl": "canonical"
              },
              {
                "url": "http://hl7.org/fhir/StructureDefinition/regex",
                "valueString": "\\S*"
              }
            ],
            "code": "http://hl7.org/fhirpath/System.String"
          }
        ]
      }
    ]
  }
}

name : canonical

{

}