<status value="active" /> <description value="CorHealth Base Observation" /> <fhirVersion value="4.0.1" /> <kind value="resource" /> <abstract value="false" /> <type value="Observation" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Observation" /> <derivation value="constraint" /> <differential> <element id="Observation"> <path value="Observation" /> <constraint> <key value="corhealth-obs-1" /> <severity value="error" /> <human value="Observation.value or Observation.dataAbsentReason SHALL be present" /> <expression value="value.exists() or dataAbsentReason.exists()" /> <source value="https://corhealth-ontario.ca/fhir/StructureDefinition/corhealth-observation" /> </constraint> </element> <element id="Observation.identifier.system"> <path value="Observation.identifier.system" /> <min value="1" /> <patternUri value="https://corhealth-ontario.ca/fhir/NamingSystem/observation-order-id" /> </element> <element id="Observation.identifier.value"> <path value="Observation.identifier.value" /> <min value="1" /> </element> <element id="Observation.status"> <path value="Observation.status" /> <patternCode value="final" /> </element> <element id="Observation.code"> <path value="Observation.code" /> <binding> <strength value="required" /> <valueSet value="https://corhealth-ontario.ca/fhir/ValueSet/CorHealthDataElementObservationVS" /> </binding> </element> <element id="Observation.subject"> <path value="Observation.subject" /> <min value="1" /> <type> <code value="Reference" /> <targetProfile value="https://corhealth-ontario.ca/fhir/StructureDefinition/corhealth-patient" /> </type> <mustSupport value="true" /> </element> <element id="Observation.value[x]"> <path value="Observation.value[x]" /> <mustSupport value="true" /> </element> <element id="Observation.dataAbsentReason"> <path value="Observation.dataAbsentReason" /> <mustSupport value="true" /> <binding> <strength value="required" /> <valueSet value="https://corhealth-ontario.ca/fhir/ValueSet/CorHealthDataAbsentReasonVS" /> </binding> </element> </differential> </StructureDefinition>