description: This extension provides a link to the order [(Reference(ServiceRequest)] or requisition [ServiceRequest.requisition (i.e., 'Request.groupIdentifier')] that this report document is based on and fulfills. package_name: hl7.fhir.eu.extensions derivation: constraint name: CompositionBasedOnOrderOrRequisition type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.eu/fhir/StructureDefinition/composition-basedOn-order-or-requisition'} index: 1 value: choices: [valueIdentifier, valueReference] index: 3 valueIdentifier: {type: Identifier, choiceOf: value, index: 4} valueReference: type: Reference choiceOf: value refers: ['http://hl7.org/fhir/StructureDefinition/ServiceRequest'] index: 5 package_version: 0.1.1-ballot extensions: {} class: extension kind: complex-type url: http://hl7.eu/fhir/StructureDefinition/composition-basedOn-order-or-requisition base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.1.1-ballot