<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="profile-dateTime-year" />
  <url value="https://bpcs.exchange/fhir/StructureDefinition/profile-dateTime-year" />
  <name value="DateTimeYear" />
  <title value="DateTime constrained to just a year" />
  <status value="active" />
  <experimental value="false" />
  <description value="A dateTime constrained to just a year" />
  <fhirVersion value="5.0.0" />
  <mapping>
    <identity value="BPCS" />
    <name value="Internal BPCS API" />
  </mapping>
  <kind value="primitive-type" />
  <abstract value="false" />
  <type value="dateTime" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/dateTime" />
  <derivation value="constraint" />
  <snapshot>
    <element id="dateTime">
      <path value="dateTime" />
      <short value="Primitive Type dateTime" />
      <definition value="A date, date-time or partial date (e.g. just year or year + month).  If hours and minutes are specified, a UTC offset SHALL be populated. The format is a union of the schema types gYear, gYearMonth, date and dateTime. Seconds must be provided due to schema type constraints but may be zero-filled and may be ignored.                 Dates SHALL be valid dates." />
      <comment value="UTC offset is allowed for dates and partial dates" />
      <min value="0" />
      <max value="*" />
      <base>
        <path value="dateTime" />
        <min value="0" />
        <max value="*" />
      </base>
      <maxLength value="4" />
      <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>
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
    </element>
    <element id="dateTime.id">
      <path value="dateTime.id" />
      <representation value="xmlAttr" />
      <short value="Unique id for inter-element referencing" />
      <definition value="Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces." />
      <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>
      <condition value="ele-1" />
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
    </element>
    <element id="dateTime.extension">
      <path value="dateTime.extension" />
      <slicing>
        <discriminator>
          <type value="value" />
          <path value="url" />
        </discriminator>
        <description value="Extensions are always sliced by (at least) url" />
        <rules value="open" />
      </slicing>
      <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 element. 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>
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
    <element id="dateTime.value">
      <path value="dateTime.value" />
      <representation value="xmlAttr" />
      <short value="Primitive value for dateTime" />
      <definition value="Primitive value for dateTime" />
      <min value="0" />
      <max value="1" />
      <base>
        <path value="dateTime.value" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type">
          <valueUrl value="dateTime" />
        </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>
  </snapshot>
  <differential>
    <element id="dateTime">
      <path value="dateTime" />
      <maxLength value="4" />
    </element>
  </differential>
</StructureDefinition>