<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="tz-code" />
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="fhir" />
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="1" />
  </extension>
  <url value="http://hl7.org/fhir/StructureDefinition/tz-code" />
  <version value="4.0.0" />
  <name value="Timezone Code" />
  <title value="An IANA timezone code for  the timezone offset per BCP 175" />
  <status value="draft" />
  <date value="2013-12-05" />
  <publisher value="Health Level Seven International (FHIR Infrastructure)" />
  <contact>
    <telecom>
      <system value="url" />
      <value value="http://www.hl7.org/Special/committees/fiwg" />
    </telecom>
  </contact>
  <description value="An IANA timezone code for  the timezone offset per [BCP 175](https://www.iana.org/go/rfc6557). The offset is specified as part of a dateTime/instant (or using the tzOffset extension on a date if necessary). The timezone code may also be provided to allow for human display of the location associated with the offset." />
  <fhirVersion value="4.0.0" />
  <mapping>
    <identity value="rim" />
    <uri value="http://hl7.org/v3" />
    <name value="RIM Mapping" />
  </mapping>
  <kind value="complex-type" />
  <abstract value="false" />
  <context>
    <type value="element" />
    <expression value="date" />
  </context>
  <context>
    <type value="element" />
    <expression value="dateTime" />
  </context>
  <context>
    <type value="element" />
    <expression value="instant" />
  </context>
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <differential>
    <element id="Extension">
      <path value="Extension" />
      <short value="IANA Timezone Code per BCP 175" />
      <definition value="An IANA timezone code for  the timezone offset per [BCP 175](https://www.iana.org/go/rfc6557). The offset is specified as part of a dateTime/instant (or using the tzOffset extension on a date if necessary). The timezone code may also be provided to allow for human display of the location associated with the offset." />
      <comment value="See [https://www.iana.org/time-zones](https://www.iana.org/time-zones)." />
      <min value="0" />
      <max value="1" />
    </element>
    <element id="Extension.extension">
      <path value="Extension.extension" />
      <max value="0" />
    </element>
    <element id="Extension.url">
      <path value="Extension.url" />
      <type>
        <code value="uri" />
      </type>
      <fixedUri value="http://hl7.org/fhir/StructureDefinition/tz-code" />
    </element>
    <element id="Extension.valueCode">
      <path value="Extension.valueCode" />
      <type>
        <code value="code" />
      </type>
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="IANATimezone" />
        </extension>
        <strength value="required" />
        <description value="IANA Timezones (BCP 175)." />
        <valueSet value="http://hl7.org/fhir/ValueSet/timezones|4.0.0" />
      </binding>
    </element>
  </differential>
</StructureDefinition>