{
  "resourceType": "StructureDefinition",
  "url": "http://example.org/fhir/StructureDefinition/RobObservation",
  "name": "RobObservation",
  "status": "draft",
  "date": "2017-09-15T01:33:29.868+00:00",
  "fhirVersion": "3.0.1",
  "kind": "resource",
  "abstract": false,
  "type": "Observation",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Observation",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Observation.extension",
        "path": "Observation.extension",
        "slicing": {
          "discriminator": [
            {
              "type": "value",
              "path": "url"
            }
          ],
          "rules": "open"
        }
      },
      {
        "id": "Observation.extension:MyExtension",
        "path": "Observation.extension",
        "sliceName": "MyExtension",
        "type": [
          {
            "code": "Extension",
            "profile": "http://example.org/fhir/StructureDefinition/PositionExtension"
          }
        ]
      },
      {
        "id": "Observation.extension:MyExtension.extension:x",
        "path": "Observation.extension.extension",
        "sliceName": "x",
        "min": 1,
        "max": "1"
      },
      {
        "id": "Observation.identifier",
        "path": "Observation.identifier",
        "slicing": {
          "discriminator": [
            {
              "type": "value",
              "path": "system"
            }
          ],
          "rules": "open"
        }
      },
      {
        "id": "Observation.identifier:ssn",
        "path": "Observation.identifier",
        "sliceName": "ssn",
        "min": 1,
        "max": "1"
      },
      {
        "id": "Observation.identifier:ssn.system",
        "path": "Observation.identifier.system",
        "fixedUri": "http://example.org/fhir/somesystem"
      },
      {
        "id": "Observation.identifier:epicid",
        "path": "Observation.identifier",
        "sliceName": "epicid"
      },
      {
        "id": "Observation.identifier:epicid.system",
        "path": "Observation.identifier.system",
        "fixedUri": "http://example.org/fhir/somesystem2"
      }
    ]
  }
}