<status value="draft" /> <date value="2025-09-11" /> <fhirVersion value="4.0.1" /> <kind value="complex-type" /> <abstract value="false" /> <type value="Coding" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Coding" /> <derivation value="constraint" /> <differential> <element id="Coding"> <path value="Coding" /> </element> <element id="Coding.system"> <path value="Coding.system" /> <min value="1" /> <fixedUri value="http://snomed.info/sct" /> </element> <element id="Coding.code"> <path value="Coding.code" /> <min value="1" /> <constraint> <key value="sct-pre-numeric" /> <severity value="error" /> <human value="SNOMED conceptId (6–18 siffer)." /> <expression value="matches('^\\d{6,18}$')" /> </constraint> </element> </differential> </StructureDefinition>