description: Use this extension to indicate tha the element has an XML namespace different to http://hl7.org/fhir. The special value `noNamespace` indicates that there is no assigned XML namespace. package_name: hl7.fhir.uv.tools derivation: constraint name: Namespace type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/tools/StructureDefinition/xml-namespace'} index: 1 value: choices: [valueUri] index: 3 valueUri: {type: uri, choiceOf: value, index: 4} package_version: 0.1.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/tools/StructureDefinition/xml-namespace base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.1.0 required: [valueUri, value]