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Source1

{
  "resourceType": "StructureDefinition",
  "id": "Extension-DataStandardsWales-SourceSystem",
  "url": "https://fhir.nhs.wales/StructureDefinition/Extension-DataStandardsWales-SourceSystem",
  "version": "0.0.1",
  "name": "ExtensionDataStandardsWalesSourceSystem",
  "title": "Extension Data Standards Wales Source System",
  "status": "draft",
  "experimental": true,
  "date": "2025-09-20",
  "publisher": "NHS Wales",
  "contact": [
    {
      "name": "FHIR Standards",
      "telecom": [
        {
          "system": "email",
          "value": "fhir.standards@wales.nhs.uk",
          "use": "work",
          "rank": 1
        }
      ]
    }
  ],
  "description": "This extension shows the repository in which a document is stored.",
  "purpose": "This extension shows the repository in which a document is stored.",
  "copyright": "2025 NHS Wales",
  "fhirVersion": "4.0.1",
  "kind": "complex-type",
  "abstract": false,
  "context": [
    {
      "type": "element",
      "expression": "DocumentReference"
    }
  ],
  "type": "Extension",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Extension",
        "path": "Extension",
        "short": "The source system for the document details.",
        "definition": "The system from which the document details were sourced to create the document reference.",
        "max": "1"
      },
      {
        "id": "Extension.url",
        "path": "Extension.url",
        "fixedUri": "https://fhir.nhs.wales/StructureDefinition/Extension-DataStandardsWales-SourceSystem"
      },
      {
        "id": "Extension.value[x]",
        "path": "Extension.value[x]",
        "short": "Source system.",
        "definition": "The source system for the document details.",
        "type": [
          {
            "code": "Reference",
            "targetProfile": [
              "https://fhir.nhs.wales/StructureDefinition/DataStandardsWales-Device"
            ]
          }
        ]
      }
    ]
  }
}