<?xml version="1.0" encoding="UTF-8"?>

<OperationOutcome xmlns="http://hl7.org/fhir">
  <id value="HddtCgmSummaryOutcomeUnknownParam"/>
  <issue>
    <severity value="error"/>
    <code value="invalid"/>
    <details>
      <coding>
        <system value="http://terminology.hl7.org/CodeSystem/operation-outcome"/>
        <code value="MSG_PARAM_UNKNOWN"/>
      </coding>
      <text value="Unknown input parameter 'foo'."/>
    </details>
  </issue>
</OperationOutcome>