<?xml version="1.0" encoding="UTF-8"?>

<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="date"/>
  <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/date"/>
  <version value="4.5.0"/>
  <name value="date"/>
  <status value="active"/>
  <date value="2020-08-20T17:41:31+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 date Type: A date or partial date (e.g. just year or year + month). There is no time zone. The format is a union of the schema types gYear, gYearMonth and date.  Dates SHALL be valid dates."/>
  <fhirVersion value="4.5.0"/>
  <kind value="primitive-type"/>
  <abstract value="false"/>
  <type value="date"/>
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/PrimitiveType"/>
  <derivation value="specialization"/>
  <snapshot>
    <element id="date">
      <path value="date"/>
      <short value="Primitive Type date"/>
      <definition value="A date or partial date (e.g. just year or year + month). There is no time zone. The format is a union of the schema types gYear, gYearMonth and date.  Dates SHALL be valid dates."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="date"/>
        <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="date.id">
      <path value="date.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">
          <valueUri value="string"/>
        </extension>
        <code value="http://hl7.org/fhirpath/System.String"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="date.extension">
      <path value="date.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="date.value">
      <path value="date.value"/>
      <representation value="xmlAttr"/>
      <short value="Primitive value for date"/>
      <definition value="The actual value"/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="date.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">
          <valueUri value="date"/>
        </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]))?)?"/>
        </extension>
        <code value="http://hl7.org/fhirpath/System.Date"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
  </snapshot>
  <differential>
    <element id="date">
      <path value="date"/>
      <short value="Primitive Type date"/>
      <definition value="A date or partial date (e.g. just year or year + month). There is no time zone. The format is a union of the schema types gYear, gYearMonth and date.  Dates SHALL be valid dates."/>
      <min value="0"/>
      <max value="*"/>
    </element>
    <element id="date.value">
      <path value="date.value"/>
      <representation value="xmlAttr"/>
      <short value="Primitive value for date"/>
      <definition value="Primitive value for date"/>
      <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">
          <valueUri value="date"/>
        </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]))?)?"/>
        </extension>
        <code value="http://hl7.org/fhirpath/System.Date"/>
      </type>
    </element>
  </differential>
</StructureDefinition>