<status value="draft" /> <date value="2014-01-31" /> <publisher value="Health Level Seven, Inc. - [WG Name] WG" /> <contact> <telecom> <system value="url" /> <value value="http://hl7.org/special/committees/FHIR" /> </telecom> </contact> <description value="For circular references (references back to the same type of resource): whether they are allowed to transitively point back to the same instance (false), or whether the relationship must be a strict one-way hierarchy (true)." /> <fhirVersion value="4.6.0" /> <mapping> <identity value="rim" /> <uri value="http://hl7.org/v3" /> <name value="RIM Mapping" /> </mapping> <kind value="complex-type" /> <abstract value="false" /> <context> <type value="element" /> <expression value="ElementDefinition.type" /> </context> <type value="Extension" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" /> <derivation value="constraint" /> <differential> <element id="Extension"> <path value="Extension" /> <short value="Whether a circular reference is allowed to (transitively) point back to the same instance" /> <definition value="For circular references (references back to the same type of resource): whether they are allowed to transitively point back to the same instance (false), or whether the relationship must be a strict one-way hierarchy (true)." /> <min value="0" /> <max value="1" /> </element> <element id="Extension.extension"> <path value="Extension.extension" /> <max value="0" /> </element> <element id="Extension.url"> <path value="Extension.url" /> <fixedUri value="http://hl7.org/fhir/StructureDefinition/structuredefinition-hierarchy" /> </element> <element id="Extension.value[x]"> <path value="Extension.value[x]" /> <min value="1" /> <type> <code value="boolean" /> </type> </element> </differential> </StructureDefinition>