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