<OperationOutcome xmlns="http://hl7.org/fhir">
  <id value="example-3" />
  <issue>
    <severity value="error" />
    <code value="processing" />
    <diagnostics value="Only supported prefix for _lastUpdated is gt(greater than)." />
  </issue>
  <test value="This is an example of an error message when a search parameter is used in an unsupported way. The elements id and text are added to clarify the example and not part of an actual reply" />
</OperationOutcome>