<?xml version="1.0" encoding="UTF-8"?><StructureDefinition xmlns="http://hl7.org/fhir"><id value="instant"/><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><url value="http://hl7.org/fhir/StructureDefinition/instant"/><version value="4.0.1"/><name value="instant"/><status value="active"/><date value="2019-11-01T09:29:23+11:00"/><publisher value="HL7 FHIR Standard"/><contact><telecom><system value="url"/><value value="http://hl7.org/fhir"/></telecom></contact><description value="Base StructureDefinition for instant Type: An instant in time - known at least to the second"/><fhirVersion value="4.0.1"/><kind value="primitive-type"/><abstract value="false"/><type value="instant"/><baseDefinition value="http://hl7.org/fhir/StructureDefinition/Element"/><derivation value="specialization"/><snapshot><element id="instant"><path value="instant"/><short value="Primitive Type instant"/><definition value="An instant in time - known at least to the second"/><comment value="Note: This is intended for where precisely observed times are required, typically system logs etc., and not human-reported times - for them, see date and dateTime (which can be as precise as instant, but is not required to be) below. Time zone is always required"/><min value="0"/><max value="*"/><base><path value="instant"/><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="http://hl7.org/fhir/StructureDefinition/Element"/></constraint><isModifier value="false"/><isSummary value="false"/></element><element id="instant.id"><path value="instant.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="instant.extension"><path value="instant.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><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="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()"/><xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), &#39;value&#39;)])"/><source value="http://hl7.org/fhir/StructureDefinition/Extension"/></constraint><isModifier value="false"/><isSummary value="false"/></element><element id="instant.value"><path value="instant.value"/><representation value="xmlAttr"/><short value="Primitive value for instant"/><definition value="The actual value"/><min value="0"/><max value="1"/><base><path value="instant.value"/><min value="0"/><max value="1"/></base><type><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"><valueUrl value="instant"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/regex"><valueString value="([0-9]([0-9]([0-9][1-9]|[1-9]0)|[1-9]00)|[1-9]000)-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])T([01][0-9]|2[0-3]):[0-5][0-9]:([0-5][0-9]|60)(\.[0-9]+)?(Z|(\+|-)((0[0-9]|1[0-3]):[0-5][0-9]|14:00))"/></extension><code value="http://hl7.org/fhirpath/System.DateTime"/></type><isModifier value="false"/><isSummary value="false"/></element></snapshot><differential><element id="instant"><path value="instant"/><short value="Primitive Type instant"/><definition value="An instant in time - known at least to the second"/><comment value="Note: This is intended for where precisely observed times are required, typically system logs etc., and not human-reported times - for them, see date and dateTime (which can be as precise as instant, but is not required to be) below. Time zone is always required"/><min value="0"/><max value="*"/></element><element id="instant.value"><path value="instant.value"/><representation value="xmlAttr"/><short value="Primitive value for instant"/><definition value="Primitive value for instant"/><min value="0"/><max value="1"/><type><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"><valueUrl value="instant"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/regex"><valueString value="([0-9]([0-9]([0-9][1-9]|[1-9]0)|[1-9]00)|[1-9]000)-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])T([01][0-9]|2[0-3]):[0-5][0-9]:([0-5][0-9]|60)(\.[0-9]+)?(Z|(\+|-)((0[0-9]|1[0-3]):[0-5][0-9]|14:00))"/></extension><code value="http://hl7.org/fhirpath/System.DateTime"/></type></element></differential></StructureDefinition>