<?xml version="1.0" encoding="UTF-8"?><StructureDefinition xmlns="http://hl7.org/fhir"><id value="string"/><text><status value="generated"/><div xmlns="http://www.w3.org/1999/xhtml">to do</div></text><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status"><valueCode value="normative"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-normative-version"><valueCode value="4.0.0"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-type-characteristics"><valueCode value="can-bind"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-type-characteristics"><valueCode value="has-length"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-type-characteristics"><valueCode value="do-translations"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"><valueCode value="fhir"/></extension><url value="http://hl7.org/fhir/StructureDefinition/string"/><version value="6.0.0-ballot4"/><name value="string"/><status value="active"/><experimental value="false"/><date value="2026-04-01T11:29:14+00:00"/><publisher value="HL7 International / FHIR Infrastructure"/><contact><telecom><system value="url"/><value value="http://hl7.org/fhir"/></telecom></contact><contact><telecom><system value="url"/><value value="http://www.hl7.org/Special/committees/fiwg"/></telecom></contact><description value="string Type: A sequence of Unicode characters"/><jurisdiction><coding><system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/><code value="001"/><display value="World"/></coding></jurisdiction><fhirVersion value="6.0.0-ballot4"/><kind value="primitive-type"/><abstract value="false"/><type value="string"/><baseDefinition value="http://hl7.org/fhir/StructureDefinition/PrimitiveType"/><derivation value="specialization"/><snapshot><element id="string"><path value="string"/><short value="Primitive Type string"/><definition value="A sequence of Unicode characters"/><comment value="Note that FHIR strings SHALL NOT exceed 1,048,576 (1024*1024) characters in size"/><min value="0"/><max value="*"/><base><path value="string"/><min value="0"/><max value="*"/></base><constraint><key value="ele-1"/><severity value="error"/><human value="All FHIR elements must have a @value or children or both"/><expression value="hasValue() or (children().count() &gt; id.count())"/><source value="http://hl7.org/fhir/StructureDefinition/Element"/></constraint><isModifier value="false"/><isSummary value="false"/></element><element id="string.id"><path value="string.id"/><representation value="xmlAttr"/><short value="xml:id (or equivalent in JSON)"/><definition value="unique id for the element within a resource (for internal references)"/><min value="0"/><max value="1"/><base><path value="Element.id"/><min value="0"/><max value="1"/></base><type><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"><valueUrl value="string"/></extension><code value="http://hl7.org/fhirpath/System.String"/></type><isModifier value="false"/><isSummary value="false"/></element><element id="string.extension"><path value="string.extension"/><short value="Additional content defined by implementations"/><definition value="May be used to represent additional information that is not part of the basic definition of the resource. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/><comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/><alias value="extensions"/><alias value="user content"/><min value="0"/><max value="*"/><base><path value="Element.extension"/><min value="0"/><max value="*"/></base><type><code value="Extension"/></type><constraint><key value="ele-1"/><severity value="error"/><human value="All FHIR elements must have a @value or children"/><expression value="hasValue() or (children().count() &gt; id.count())"/><source value="http://hl7.org/fhir/StructureDefinition/Element"/></constraint><constraint><key value="ext-1"/><severity value="error"/><human value="Must have either extensions or value[x], not both"/><expression value="extension.exists() != value.exists()"/><source value="http://hl7.org/fhir/StructureDefinition/Extension"/></constraint><isModifier value="false"/><isSummary value="false"/></element><element id="string.value"><path value="string.value"/><representation value="xmlAttr"/><short value="Primitive value for string"/><definition value="The actual value"/><min value="0"/><max value="1"/><base><path value="string.value"/><min value="0"/><max value="1"/></base><type><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"><valueUrl value="string"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/regex"><valueString value="^[\s\S]+$"/></extension><code value="http://hl7.org/fhirpath/System.String"/></type><maxLength value="1048576"/><isModifier value="false"/><isSummary value="false"/></element></snapshot><differential><element id="string"><path value="string"/><short value="Primitive Type string"/><definition value="A sequence of Unicode characters"/><comment value="Note that FHIR strings SHALL NOT exceed 1,048,576 (1024*1024) characters in size"/><min value="0"/><max value="*"/></element><element id="string.value"><path value="string.value"/><representation value="xmlAttr"/><short value="Primitive value for string"/><definition value="Primitive value for string"/><min value="0"/><max value="1"/><type><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"><valueUrl value="string"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/regex"><valueString value="^[\s\S]+$"/></extension><code value="http://hl7.org/fhirpath/System.String"/></type><maxLength value="1048576"/></element></differential></StructureDefinition>