<OperationOutcome xmlns="http://hl7.org/fhir">
  <meta>
    <tag>
      <display value="OperationOutcome with a system error" />
    </tag>
    <tag>
      <display value="OperationOutcome with a system error without error code" />
    </tag>
    <tag>
      <display value="operationoutcome-example-4" />
    </tag>
  </meta>
  <issue>
    <severity value="error" />
    <code value="processing" />
    <diagnostics value="Failed to parse request body as JSON resource. Error was: Unknown element 'valueCode' found during parse" />
  </issue>
</OperationOutcome>