<status value="draft" /> <date value="2019-03-08" /> <publisher value="HL7 Canada" /> <description value="A version string indicating the currency/validity of an identifier" /> <kind value="complex-type" /> <abstract value="false" /> <context> <type value="element" /> <expression value="Patient.identifier" /> </context> <type value="Extension" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" /> <derivation value="constraint" /> <differential> <element id="Extension"> <path value="Extension" /> <definition value="A code indicating a specific version of an identifier credential" /> <comment value="For example, a health card version number, credit card version number, etc. Used to help verify the authenticity of a credential" /> <max value="1" /> <mustSupport value="false" /> </element> <element id="Extension.url"> <path value="Extension.url" /> <fixedUri value="http://hl7.org/fhir/ca/baseline/StructureDefinition/ext-identifierversion" /> </element> <element id="Extension.value[x]"> <path value="Extension.value[x]" /> <slicing> <discriminator> <type value="type" /> <path value="$this" /> </discriminator> <rules value="closed" /> </slicing> <type> <code value="string" /> </type> </element> <element id="Extension.value[x]:valueString"> <path value="Extension.value[x]" /> <sliceName value="valueString" /> <min value="1" /> <type> <code value="string" /> </type> <mustSupport value="true" /> </element> </differential> </StructureDefinition>