{
  "resourceType": "StructureDefinition",
  "url": "https://Ex2.org/fhir/StructureDefinition/Ex2Observation",
  "name": "Ex2Observation",
  "status": "draft",
  "description": "Observation profile for Exercise 2",
  "fhirVersion": "4.0.1",
  "kind": "resource",
  "abstract": false,
  "type": "Observation",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Observation",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Observation",
        "path": "Observation",
        "definition": "Observation profile for Exercise 2",
        "constraint": [
          {
            "key": "gareth-obs-1",
            "severity": "error",
            "human": "Must complete value or note",
            "expression": "valueofType(quantity).exists() or note.exists()"
          }
        ]
      },
      {
        "id": "Observation.extension",
        "path": "Observation.extension",
        "slicing": {
          "discriminator": [
            {
              "type": "value",
              "path": "url"
            }
          ],
          "rules": "open"
        },
        "min": 1
      },
      {
        "id": "Observation.extension:LateralityExtension",
        "path": "Observation.extension",
        "sliceName": "LateralityExtension",
        "min": 1,
        "max": "1",
        "type": [
          {
            "code": "Extension",
            "profile": [
              "https://Ex3.org/fhir/StructureDefinition/Ex3LateralityExtension"
            ]
          }
        ],
        "isModifier": false
      },
      {
        "id": "Observation.extension:LateralityExtension.value[x]",
        "path": "Observation.extension.value[x]",
        "code": [
          {
            "system": "http://snomed.info/sct",
            "code": "272741003",
            "display": "Laterality (attribute)"
          }
        ]
      },
      {
        "id": "Observation.identifier",
        "path": "Observation.identifier",
        "slicing": {
          "discriminator": [
            {
              "type": "value",
              "path": "system"
            }
          ],
          "rules": "open"
        },
        "min": 1,
        "max": "1",
        "mustSupport": true
      },
      {
        "id": "Observation.identifier:NHSNumber",
        "path": "Observation.identifier",
        "sliceName": "NHSNumber",
        "max": "1",
        "mustSupport": true
      },
      {
        "id": "Observation.identifier:NHSNumber.system",
        "path": "Observation.identifier.system",
        "min": 1,
        "fixedUri": "https://fhir.nhs.uk/Id/nhs-number"
      },
      {
        "id": "Observation.identifier:NHSNumber.value",
        "path": "Observation.identifier.value",
        "min": 1
      },
      {
        "id": "Observation.identifier:sliceIdentifier",
        "path": "Observation.identifier",
        "sliceName": "sliceIdentifier",
        "min": 1,
        "max": "1",
        "mustSupport": true
      },
      {
        "id": "Observation.identifier:sliceIdentifier.system",
        "path": "Observation.identifier.system",
        "min": 1
      },
      {
        "id": "Observation.identifier:sliceIdentifier.value",
        "path": "Observation.identifier.value",
        "min": 1
      },
      {
        "id": "Observation.status",
        "path": "Observation.status",
        "mustSupport": true
      },
      {
        "id": "Observation.code.coding.system",
        "path": "Observation.code.coding.system",
        "fixedUri": "Snomed URL"
      },
      {
        "id": "Observation.code.coding.code",
        "path": "Observation.code.coding.code",
        "fixedCode": "118230007"
      },
      {
        "id": "Observation.code.coding.display",
        "path": "Observation.code.coding.display",
        "fixedString": "Hearing finding (finding)"
      },
      {
        "id": "Observation.subject",
        "path": "Observation.subject",
        "min": 1,
        "type": [
          {
            "code": "Reference",
            "targetProfile": [
              "https://Ex2.org/fhir/StructureDefinition/Ex2Patient"
            ]
          }
        ],
        "mustSupport": true
      },
      {
        "id": "Observation.effective[x]",
        "path": "Observation.effective[x]",
        "min": 1,
        "mustSupport": true
      },
      {
        "id": "Observation.value[x]",
        "path": "Observation.value[x]",
        "min": 1,
        "type": [
          {
            "code": "CodeableConcept"
          }
        ],
        "condition": [
          "gareth-obs-1"
        ],
        "mustSupport": true
      },
      {
        "id": "Observation.note",
        "path": "Observation.note",
        "mustSupport": true
      },
      {
        "id": "Observation.note.text",
        "path": "Observation.note.text",
        "condition": [
          "gareth-obs-1"
        ]
      },
      {
        "id": "Observation.method",
        "path": "Observation.method",
        "min": 1,
        "mustSupport": true
      },
      {
        "id": "Observation.device",
        "path": "Observation.device",
        "min": 1,
        "mustSupport": true
      },
      {
        "id": "Observation.derivedFrom",
        "path": "Observation.derivedFrom",
        "max": "1",
        "mustSupport": true
      },
      {
        "id": "Observation.component.referenceRange",
        "path": "Observation.component.referenceRange",
        "contentReference": "http://hl7.org/fhir/StructureDefinition/Observation#Observation.referenceRange"
      }
    ]
  }
}