<status value="active" /> <date value="2026-03-23" /> <publisher value="Israel Core Team" /> <contact> <telecom> <system value="email" /> <value value="tal.primak@moh.gov.il" /> </telecom> </contact> <description value="Israel Core Proposed constraints and extensions on the Identifier data type." /> <fhirVersion value="4.0.1" /> <kind value="complex-type" /> <abstract value="false" /> <type value="Identifier" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Identifier" /> <derivation value="constraint" /> <differential> <element id="Identifier"> <path value="Identifier" /> <short value="ILCore Identifier Profile" /> <constraint> <key value="il-core-identifier-system" /> <severity value="error" /> <human value="An identifier SHALL have a value in the system element, otherwise, the two following conditions must be met: a DataAbsentReason extension on system SHALL be provided AND the type SHALL be populated." /> <expression value="system.hasValue() or (system.extension.where(url='http://hl7.org/fhir/StructureDefinition/data-absent-reason').exists() and type.exists())" /> <source value="http://fhir.health.gov.il/StructureDefinition/il-core-identifier" /> </constraint> </element> <element id="Identifier.type"> <path value="Identifier.type" /> <binding> <strength value="extensible" /> <valueSet value="http://fhir.health.gov.il/ValueSet/il-core-identifier-type" /> </binding> </element> </differential> </StructureDefinition>