<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 data event approach."/><purpose value="Monitor when 3 consecutive negative stick tests have occurred using a data change event."/><trigger><type value="data-changed"/><data><type value="Observation"/><codeFilter><path value="code"/><valueSet value="http://example.org/ValueSet/stick-test-codes"/></codeFilter></data><condition><language value="text/cql-expression"/><expression value="StickTest.consecutivelyAfter(%context).take(3).negative().count() = 3"/></condition></trigger></EventDefinition>