StructureDefinition for instant

<?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> 
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-type-characteristics">
    <valueCode value="has-range"/> 
  </extension> 
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-type-characteristics">
    <valueCode value="is-continuous"/> 
  </extension> 
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-type-characteristics">
    <valueCode value="has-length"/> 
  </extension> 
  <url value="http://hl7.org/fhir/StructureDefinition/instant"/> 
  <version value="5.0.0"/> 
  <name value="instant"/> 
  <status value="active"/> 
  <experimental value="false"/> 
  <date value="2023-03-26T15:21:02+11:00"/> 
  <publisher value="HL7 FHIR Standard"/> 
  <contact> 
    <telecom> 
      <system value="url"/> 
      <value value="http://hl7.org/fhir"/> 
    </telecom> 
  </contact> 
  <description value="instant Type: An instant in time - known at least to the second"/> 
  <jurisdiction> 
    <coding> 
      <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/> 
      <code value="001"/> 
      <display value="World"/> 
    </coding> 
  </jurisdiction> 
  <fhirVersion value="5.0.0"/> 
  <kind value="primitive-type"/> 
  <abstract value="false"/> 
  <type value="instant"/> 
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/PrimitiveType"/> 
  <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. UTC offset
       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())"/> 
        <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 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="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> 
      <!--  Note: special primitive values have a FHIRPath system type. e.g. this is compiler
       magic (c)  -->
      <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]{1,9})?(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. UTC offset
       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"/> 
      <!--  Note: special primitive values have a FHIRPath system type. e.g. this is compiler
       magic (a)  -->
      <!--  Note: special primitive values have a FHIRPath system type. e.g. this is compiler
       magic (b)  -->
      <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]{1,9})?(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>