Example of an EventDefinition using the periodic approach. (id = "example-periodic")

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

<EventDefinition xmlns="http://hl7.org/fhir">
  <id value="example-periodic"/> 
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status">
    <valueCode value="informative"/> 
  </extension> 
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="6"/> 
  </extension> 
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="cds"/> 
  </extension> 
  <extension url="http://hl7.org/fhir/StructureDefinition/cqf-library">
    <valueCanonical value="http://hl7.org/fhir/EventDefinition/ExampleEventDefinitionLogic"/> 
  </extension> 
  <url value="http://hl7.org/fhir/EventDefinition/example-periodic"/> 
  <name value="PeriodicEventDefinitionExample"/> 
  <title value="Periodic EventDefinition Example"/> 
  <status value="draft"/> 
  <experimental value="true"/> 
  <publisher value="HL7 International / Clinical Decision Support"/> 
  <contact> 
    <telecom> 
      <system value="url"/> 
      <value value="http://www.hl7.org/Special/committees/dss"/> 
    </telecom> 
  </contact> 
  <description value="Example of an EventDefinition using the periodic event approach."/> 
  <purpose value="Monitor when 3 consecutive negative stick tests have occurred using a periodic
   event."/> 
  <trigger> 
    <type value="periodic"/> 
    <timingTiming> 
      <repeat> 
        <frequency value="1"/> 
        <period value="3"/> 
        <periodUnit value="h"/> 
      </repeat> 
    </timingTiming> 
    <condition> 
      <language value="text/cql-expression"/> 
      <expression value="StickTest.within(3 hours).consecutively.take(3).negative().count() = 3"/> 
    </condition> 
  </trigger> 
</EventDefinition>