{
  "resourceType": "StructureDefinition",
  "url": "https://example.org/fhir/StructureDefinition/Observation_with_pattern_and_element_constraints",
  "name": "Observation_with_pattern_and_element_constraints",
  "status": "draft",
  "fhirVersion": "4.0.1",
  "kind": "resource",
  "abstract": false,
  "type": "Observation",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Observation",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Observation.category",
        "path": "Observation.category",
        "patternCodeableConcept": {
          "coding": [
            {
              "system": "http://hl7.org/fhir/sid/icd-10",
              "code": "45566"
            }
          ]
        }
      },
      {
        "id": "Observation.category.coding.system",
        "path": "Observation.category.coding.system",
        "min": 1
      },
      {
        "id": "Observation.category.coding.code",
        "path": "Observation.category.coding.code",
        "min": 1
      },
      {
        "id": "Observation.category.coding.display",
        "path": "Observation.category.coding.display",
        "min": 1
      }
    ]
  }
}