<?xml version="1.0" encoding="UTF-8"?><StructureDefinition xmlns="http://hl7.org/fhir"><id value="id"/><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"><valueString value="Normative"/></extension><url value="http://hl7.org/fhir/StructureDefinition/id"/><name value="id"/><status value="draft"/><date value="2018-08-19T21:48:56+10:00"/><publisher value="HL7 FHIR Standard"/><contact><telecom><system value="url"/><value value="http://hl7.org/fhir"/></telecom></contact><description value="Base StructureDefinition for id type: Any combination of letters, numerals, &quot;-&quot; and &quot;.&quot;, with a length limit of 64 characters.  (This might be an integer, an unprefixed OID, UUID or any other identifier pattern that meets these constraints.)  Ids are case-insensitive."/><fhirVersion value="3.5.0"/><kind value="primitive-type"/><abstract value="false"/><type value="id"/><baseDefinition value="http://hl7.org/fhir/StructureDefinition/string"/><derivation value="specialization"/><snapshot><element id="id"><path value="id"/><short value="Primitive Type id"/><definition value="Any combination of letters, numerals, &quot;-&quot; and &quot;.&quot;, with a length limit of 64 characters.  (This might be an integer, an unprefixed OID, UUID or any other identifier pattern that meets these constraints.)  Ids are case-insensitive."/><comment value="RFC 4122"/><min value="0"/><max value="*"/><base><path value="id"/><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"/><expression value="hasValue() or (children().count() &gt; id.count())"/><xpath value="@value|f:*|h:div"/><source value="Element"/></constraint><isModifier value="false"/><isSummary value="false"/></element><element id="id.id"><path value="id.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><code value="string"/></type><isModifier value="false"/><isSummary value="false"/></element><element id="id.extension"><path value="id.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 manageable, 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><isModifier value="false"/><isSummary value="false"/></element><element id="id.value"><path value="id.value"/><representation value="xmlAttr"/><short value="Primitive value for id"/><definition value="Primitive value for id"/><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/regex"><valueString value="[A-Za-z0-9\-\.]{1,64}"/></extension><code><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-json-type"><valueString value="string"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-xml-type"><valueString value="xsd:string"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-rdf-type"><valueString value="xsd:string"/></extension></code></type><isModifier value="false"/><isSummary value="false"/></element></snapshot><differential><element id="id"><path value="id"/><short value="Primitive Type id"/><definition value="Any combination of letters, numerals, &quot;-&quot; and &quot;.&quot;, with a length limit of 64 characters.  (This might be an integer, an unprefixed OID, UUID or any other identifier pattern that meets these constraints.)  Ids are case-insensitive."/><comment value="RFC 4122"/><min value="0"/><max value="*"/></element><element id="id.value"><path value="id.value"/><representation value="xmlAttr"/><short value="Primitive value for id"/><definition value="Primitive value for id"/><min value="0"/><max value="1"/><type><extension url="http://hl7.org/fhir/StructureDefinition/regex"><valueString value="[A-Za-z0-9\-\.]{1,64}"/></extension><code><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-json-type"><valueString value="string"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-xml-type"><valueString value="xsd:string"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-rdf-type"><valueString value="xsd:string"/></extension></code></type></element></differential></StructureDefinition>