An example of an alert message (id = "example")

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

<Communication xmlns="http://hl7.org/fhir">
  <id value="example"/> 
  <text> 
    <status value="generated"/> 
    <div xmlns="http://www.w3.org/1999/xhtml">Patient has very high serum potassium</div> 
  </text> 
  <identifier> 
    <type> 
      <text value="Paging System"/> 
    </type> 
    <system value="urn:oid:1.3.4.5.6.7"/> 
    <value value="2345678901"/> 
  </identifier> 
  <instantiatesUri value="http://example.org/hyperkalemia"/> 
  <partOf> 
  <display value="Serum Potassium Observation"/> 
  </partOf> 
  <status value="completed"/> 
  <category> 
    <coding> 
      <system value="http://acme.org/messagetypes"/> 
      <code value="Alert"/> 
    </coding> 
    <text value="Alert"/> 
  </category> 
  <medium> 
    <coding> 
      <system value="http://terminology.hl7.org/CodeSystem/v3-ParticipationMode"/> 
      <code value="WRITTEN"/> 
      <display value="written"/> 
    </coding> 
    <text value="written"/> 
  </medium> 
  <subject> 
    <reference value="Patient/example"/> 
  </subject> 
  
  <encounter> 
    <reference value="Encounter/example"/> 
  </encounter> 
  <sent value="2014-12-12T18:01:10-08:00"/> 
  <received value="2014-12-12T18:01:11-08:00"/> 
  <recipient> 
    <reference value="Practitioner/example"/> 
  </recipient> 
  <sender> 
    <reference value="Device/f001"/> 
  </sender> 
  
  <payload> 
    <contentCodeableConcept> 
    <text value="Patient 1 has a very high serum potassium value (7.2 mmol/L on 2014-Dec-12 at 5:55
       pm)"/> 
  </contentCodeableConcept> 
  </payload> 
  <payload> 
      <!--  Reference to the lab result   -->
    <contentReference> 
      <display value="Serum Potassium Observation"/> 
    </contentReference> 
  </payload> 
</Communication>