curl -v -H "accept: application/fhir+xml" -X GET "http://fhirserver/Practitioner/?_id=Practitioner-Read-Example" 

{"empty": false}

{
  "locationCol": 284,
  "severity": "WARNING",
  "locationString": "Bundle.entry[0].resource/*Practitioner/Practitioner-Read-Example*/.meta.profile[0]",
  "messageId": "Validation_VAL_Profile_Unknown",
  "locationLine": 2,
  "message": "Profile reference 'https://gematik.de/fhir/isik/StructureDefinition/ISiKPersonImGesundheitsberuf' has not been checked because it is unknown"
}

{
  "severity": "WARNING",
  "messageId": "REFV_WARN_PASSED_PROFILE_DIFFERS_FROM_META_PROFILE",
  "message": "Resource meta.profile differs from the passed profile for validation: meta.profile=[]; passed=https://hl7.org/fhir/StructureDefinition/Bundle"
}

{
  "locationCol": 834,
  "severity": "INFORMATION",
  "locationString": "Practitioner.identifier[2]",
  "locationLine": 1,
  "message": "This element does not match any known slice defined in the profile https://gematik.de/fhir/isik/StructureDefinition/ISiKPersonImGesundheitsberuf|5.1.2"
}

{
  "locationCol": 1082,
  "severity": "WARNING",
  "locationString": "Practitioner.address[0]",
  "messageId": "Rule add-7: 'Wenn die Extension 'Precinct' (Stadtteil) verwendet wird, dann muss diese Information auch als separates line-item abgebildet sein.' Failed",
  "locationLine": 1,
  "message": "Rule add-7: 'Wenn die Extension 'Precinct' (Stadtteil) verwendet wird, dann muss diese Information auch als separates line-item abgebildet sein.' Failed"
}

{
  "locationCol": 607,
  "severity": "INFORMATION",
  "locationString": "Practitioner.identifier[1]",
  "locationLine": 1,
  "message": "This element does not match any known slice defined in the profile https://gematik.de/fhir/ti/StructureDefinition/ti-practitioner|1.1.1"
}