<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>