description: Base StructureDefinition for Linkage Resource package_name: hl7.fhir.r2b.examples derivation: specialization name: Linkage type: null elements: author: isModifier: false short: Who is responsible for linkages type: Reference mustSupport: false maxLength: 0 base: {max: '1', min: 0, path: Linkage.author} isSummary: true index: 0 item: min: 1 isModifier: false short: Item to be linked index: 1 type: BackboneElement mustSupport: false array: true elements: type: isModifier: false short: source | alternate | historical index: 2 type: code mustSupport: false maxLength: 0 base: {max: '1', min: 0, path: Linkage.item.type} isSummary: true resource: isModifier: false short: Resource being linked index: 3 type: Reference mustSupport: false maxLength: 0 base: {max: '1', min: 0, path: Linkage.item.resource} isSummary: true maxLength: 0 base: {max: '*', min: 0, path: Linkage.item} required: [resource, type] isSummary: true package_version: 1.4.0 class: resource kind: resource url: http://hl7.org/fhir/StructureDefinition/Linkage base: http://hl7.org/fhir/StructureDefinition/DomainResource version: null required: [item]