This page is part of the FHIR Specification (v1.6.0: STU 3 Ballot 4). The current version which supercedes this version is 5.0.0. For a full list of available versions, see the Directory of published versions . Page versions: R4B R4 R3
Extension-codesystem-history.xml

Raw XML (canonical form)
What has happened over time
<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="codesystem-history"/>
  <url value="http://hl7.org/fhir/StructureDefinition/codesystem-history"/>
  <name value="What has happened over time"/>
  <status value="draft"/>
  <publisher value="HL7"/>
  <date value="2016-08-11T17:02:54+10:00"/>
  <description value="Information on changes made to the Value Set Definition over time, and also has a contained
   audit trail of all such changes."/>
  <fhirVersion value="1.6.0"/>
  <mapping>
    <identity value="rim"/>
    <uri value="http://hl7.org/v3"/>
    <name value="RIM Mapping"/>
  </mapping>
  <kind value="complex-type"/>
  <abstract value="false"/>
  <contextType value="resource"/>
  <context value="CodeSystem"/>
  <type value="Extension"/>
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension"/>
  <derivation value="constraint"/>
  <snapshot>
    <element id="Extension:whathashappenedovertime">
      <path value="Extension"/>
      <short value="What has happened over time"/>
      <definition value="Information on changes made to the Value Set Definition over time, and also has a contained
       audit trail of all such changes."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="Extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <condition value="ele-1"/>
      <constraint>
        <key value="ele-1"/>
        <severity value="error"/>
        <human value="All FHIR elements must have a @value or children"/>
        <expression value="children().count() &gt; id.count()"/>
        <xpath value="@value|f:*|h:div"/>
      </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(.), 'value')])"/>
      </constraint>
      <isModifier value="false"/>
    </element>
    <element id="Extension:whathashappenedovertime.id">
      <path value="Extension.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). 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="*"/>
      </base>
      <type>
        <code value="string"/>
      </type>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension">
      <path value="Extension.extension"/>
      <slicing id="80">
        <discriminator value="url"/>
        <ordered value="false"/>
        <rules value="open"/>
      </slicing>
      <short value="Extension"/>
      <definition value="An Extension"/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
    </element>
    <element id="Extension:whathashappenedovertime.extension:name">
      <path value="Extension.extension"/>
      <name value="name"/>
      <short value="The name of this set of history entries"/>
      <definition value="Label for a set of entries, such as a version."/>
      <comments value="Typically, a value set will have a set of history entries for each major publication milestone."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:name.id">
      <path value="Extension.extension.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). 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="*"/>
      </base>
      <type>
        <code value="string"/>
      </type>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:name.extension:extension">
      <path value="Extension.extension.extension"/>
      <name value="extension"/>
      <short value="Extension"/>
      <definition value="An Extension"/>
      <min value="0"/>
      <max value="0"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
    </element>
    <element id="Extension:whathashappenedovertime.extension:name.url">
      <path value="Extension.extension.url"/>
      <representation value="xmlAttr"/>
      <short value="identifies the meaning of the extension"/>
      <definition value="Source of the definition for the extension code - a logical name or a URL."/>
      <comments value="The definition may point directly to a computable or human-readable definition of the
       extensibility codes, or it may be a logical URI as declared in some other specification.
       The definition SHALL be a URI for the Structure Definition defining the extension."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.url"/>
        <min value="1"/>
        <max value="1"/>
      </base>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="name"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:name.valueString">
      <path value="Extension.extension.valueString"/>
      <short value="Value of extension"/>
      <definition value="Value of extension - may be a resource or one of a constrained set of the data types (see
       Extensibility in the spec for list)."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.value[x]"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code value="string"/>
      </type>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision">
      <path value="Extension.extension"/>
      <name value="revision"/>
      <short value="Audit of all changes for a history entry"/>
      <definition value="A list of specific changes, who made them and when."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.id">
      <path value="Extension.extension.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). 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="*"/>
      </base>
      <type>
        <code value="string"/>
      </type>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension">
      <path value="Extension.extension.extension"/>
      <slicing id="81">
        <discriminator value="url"/>
        <ordered value="false"/>
        <rules value="open"/>
      </slicing>
      <short value="Extension"/>
      <definition value="An Extension"/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:date">
      <path value="Extension.extension.extension"/>
      <name value="date"/>
      <short value="Date the change was made"/>
      <definition value="Date the change took place."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:date.id">
      <path value="Extension.extension.extension.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). 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="*"/>
      </base>
      <type>
        <code value="string"/>
      </type>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:date.extension:extension">
      <path value="Extension.extension.extension.extension"/>
      <name value="extension"/>
      <short value="Extension"/>
      <definition value="An Extension"/>
      <min value="0"/>
      <max value="0"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:date.url">
      <path value="Extension.extension.extension.url"/>
      <representation value="xmlAttr"/>
      <short value="identifies the meaning of the extension"/>
      <definition value="Source of the definition for the extension code - a logical name or a URL."/>
      <comments value="The definition may point directly to a computable or human-readable definition of the
       extensibility codes, or it may be a logical URI as declared in some other specification.
       The definition SHALL be a URI for the Structure Definition defining the extension."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.url"/>
        <min value="1"/>
        <max value="1"/>
      </base>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="date"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:date.valueDateTime">
      <path value="Extension.extension.extension.valueDateTime"/>
      <short value="Value of extension"/>
      <definition value="Value of extension - may be a resource or one of a constrained set of the data types (see
       Extensibility in the spec for list)."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.value[x]"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code value="dateTime"/>
      </type>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:id">
      <path value="Extension.extension.extension"/>
      <name value="id"/>
      <short value="Version marker after the change was made"/>
      <definition value="Unique id for the specific change."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:id.id">
      <path value="Extension.extension.extension.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). 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="*"/>
      </base>
      <type>
        <code value="string"/>
      </type>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:id.extension:extension">
      <path value="Extension.extension.extension.extension"/>
      <name value="extension"/>
      <short value="Extension"/>
      <definition value="An Extension"/>
      <min value="0"/>
      <max value="0"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:id.url">
      <path value="Extension.extension.extension.url"/>
      <representation value="xmlAttr"/>
      <short value="identifies the meaning of the extension"/>
      <definition value="Source of the definition for the extension code - a logical name or a URL."/>
      <comments value="The definition may point directly to a computable or human-readable definition of the
       extensibility codes, or it may be a logical URI as declared in some other specification.
       The definition SHALL be a URI for the Structure Definition defining the extension."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.url"/>
        <min value="1"/>
        <max value="1"/>
      </base>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="id"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:id.valueString">
      <path value="Extension.extension.extension.valueString"/>
      <short value="Value of extension"/>
      <definition value="Value of extension - may be a resource or one of a constrained set of the data types (see
       Extensibility in the spec for list)."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.value[x]"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code value="string"/>
      </type>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:author">
      <path value="Extension.extension.extension"/>
      <name value="author"/>
      <short value="Who made the change"/>
      <definition value="Person or device responsible for the change."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:author.id">
      <path value="Extension.extension.extension.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). 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="*"/>
      </base>
      <type>
        <code value="string"/>
      </type>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:author.extension:extension">
      <path value="Extension.extension.extension.extension"/>
      <name value="extension"/>
      <short value="Extension"/>
      <definition value="An Extension"/>
      <min value="0"/>
      <max value="0"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:author.url">
      <path value="Extension.extension.extension.url"/>
      <representation value="xmlAttr"/>
      <short value="identifies the meaning of the extension"/>
      <definition value="Source of the definition for the extension code - a logical name or a URL."/>
      <comments value="The definition may point directly to a computable or human-readable definition of the
       extensibility codes, or it may be a logical URI as declared in some other specification.
       The definition SHALL be a URI for the Structure Definition defining the extension."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.url"/>
        <min value="1"/>
        <max value="1"/>
      </base>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="author"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:author.valueString">
      <path value="Extension.extension.extension.valueString"/>
      <short value="Value of extension"/>
      <definition value="Value of extension - may be a resource or one of a constrained set of the data types (see
       Extensibility in the spec for list)."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.value[x]"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code value="string"/>
      </type>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:notes">
      <path value="Extension.extension.extension"/>
      <name value="notes"/>
      <short value="Information about the change"/>
      <definition value="Description of exactly what was changed and how."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:notes.id">
      <path value="Extension.extension.extension.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). 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="*"/>
      </base>
      <type>
        <code value="string"/>
      </type>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:notes.extension:extension">
      <path value="Extension.extension.extension.extension"/>
      <name value="extension"/>
      <short value="Extension"/>
      <definition value="An Extension"/>
      <min value="0"/>
      <max value="0"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:notes.url">
      <path value="Extension.extension.extension.url"/>
      <representation value="xmlAttr"/>
      <short value="identifies the meaning of the extension"/>
      <definition value="Source of the definition for the extension code - a logical name or a URL."/>
      <comments value="The definition may point directly to a computable or human-readable definition of the
       extensibility codes, or it may be a logical URI as declared in some other specification.
       The definition SHALL be a URI for the Structure Definition defining the extension."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.url"/>
        <min value="1"/>
        <max value="1"/>
      </base>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="notes"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:notes.valueString">
      <path value="Extension.extension.extension.valueString"/>
      <short value="Value of extension"/>
      <definition value="Value of extension - may be a resource or one of a constrained set of the data types (see
       Extensibility in the spec for list)."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.value[x]"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code value="string"/>
      </type>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.url">
      <path value="Extension.extension.url"/>
      <representation value="xmlAttr"/>
      <short value="identifies the meaning of the extension"/>
      <definition value="Source of the definition for the extension code - a logical name or a URL."/>
      <comments value="The definition may point directly to a computable or human-readable definition of the
       extensibility codes, or it may be a logical URI as declared in some other specification.
       The definition SHALL be a URI for the Structure Definition defining the extension."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.url"/>
        <min value="1"/>
        <max value="1"/>
      </base>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="revision"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.value[x]">
      <path value="Extension.extension.value[x]"/>
      <short value="Value of extension"/>
      <definition value="Value of extension - may be a resource or one of a constrained set of the data types (see
       Extensibility in the spec for list)."/>
      <min value="0"/>
      <max value="0"/>
      <base>
        <path value="Extension.value[x]"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code value="base64Binary"/>
      </type>
      <type>
        <code value="boolean"/>
      </type>
      <type>
        <code value="code"/>
      </type>
      <type>
        <code value="date"/>
      </type>
      <type>
        <code value="dateTime"/>
      </type>
      <type>
        <code value="decimal"/>
      </type>
      <type>
        <code value="id"/>
      </type>
      <type>
        <code value="instant"/>
      </type>
      <type>
        <code value="integer"/>
      </type>
      <type>
        <code value="markdown"/>
      </type>
      <type>
        <code value="oid"/>
      </type>
      <type>
        <code value="positiveInt"/>
      </type>
      <type>
        <code value="string"/>
      </type>
      <type>
        <code value="time"/>
      </type>
      <type>
        <code value="unsignedInt"/>
      </type>
      <type>
        <code value="uri"/>
      </type>
      <type>
        <code value="Address"/>
      </type>
      <type>
        <code value="Age"/>
      </type>
      <type>
        <code value="Annotation"/>
      </type>
      <type>
        <code value="Attachment"/>
      </type>
      <type>
        <code value="CodeableConcept"/>
      </type>
      <type>
        <code value="Coding"/>
      </type>
      <type>
        <code value="ContactPoint"/>
      </type>
      <type>
        <code value="Count"/>
      </type>
      <type>
        <code value="Distance"/>
      </type>
      <type>
        <code value="Duration"/>
      </type>
      <type>
        <code value="HumanName"/>
      </type>
      <type>
        <code value="Identifier"/>
      </type>
      <type>
        <code value="Money"/>
      </type>
      <type>
        <code value="Period"/>
      </type>
      <type>
        <code value="Quantity"/>
      </type>
      <type>
        <code value="Range"/>
      </type>
      <type>
        <code value="Ratio"/>
      </type>
      <type>
        <code value="Reference"/>
      </type>
      <type>
        <code value="SampledData"/>
      </type>
      <type>
        <code value="Signature"/>
      </type>
      <type>
        <code value="Timing"/>
      </type>
      <type>
        <code value="Meta"/>
      </type>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.url">
      <path value="Extension.url"/>
      <representation value="xmlAttr"/>
      <short value="identifies the meaning of the extension"/>
      <definition value="Source of the definition for the extension code - a logical name or a URL."/>
      <comments value="The definition may point directly to a computable or human-readable definition of the
       extensibility codes, or it may be a logical URI as declared in some other specification.
       The definition SHALL be a URI for the Structure Definition defining the extension."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.url"/>
        <min value="1"/>
        <max value="1"/>
      </base>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="http://hl7.org/fhir/StructureDefinition/codesystem-history"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension:whathashappenedovertime.value[x]">
      <path value="Extension.value[x]"/>
      <short value="Value of extension"/>
      <definition value="Value of extension - may be a resource or one of a constrained set of the data types (see
       Extensibility in the spec for list)."/>
      <min value="0"/>
      <max value="0"/>
      <base>
        <path value="Extension.value[x]"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code value="base64Binary"/>
      </type>
      <type>
        <code value="boolean"/>
      </type>
      <type>
        <code value="code"/>
      </type>
      <type>
        <code value="date"/>
      </type>
      <type>
        <code value="dateTime"/>
      </type>
      <type>
        <code value="decimal"/>
      </type>
      <type>
        <code value="id"/>
      </type>
      <type>
        <code value="instant"/>
      </type>
      <type>
        <code value="integer"/>
      </type>
      <type>
        <code value="markdown"/>
      </type>
      <type>
        <code value="oid"/>
      </type>
      <type>
        <code value="positiveInt"/>
      </type>
      <type>
        <code value="string"/>
      </type>
      <type>
        <code value="time"/>
      </type>
      <type>
        <code value="unsignedInt"/>
      </type>
      <type>
        <code value="uri"/>
      </type>
      <type>
        <code value="Address"/>
      </type>
      <type>
        <code value="Age"/>
      </type>
      <type>
        <code value="Annotation"/>
      </type>
      <type>
        <code value="Attachment"/>
      </type>
      <type>
        <code value="CodeableConcept"/>
      </type>
      <type>
        <code value="Coding"/>
      </type>
      <type>
        <code value="ContactPoint"/>
      </type>
      <type>
        <code value="Count"/>
      </type>
      <type>
        <code value="Distance"/>
      </type>
      <type>
        <code value="Duration"/>
      </type>
      <type>
        <code value="HumanName"/>
      </type>
      <type>
        <code value="Identifier"/>
      </type>
      <type>
        <code value="Money"/>
      </type>
      <type>
        <code value="Period"/>
      </type>
      <type>
        <code value="Quantity"/>
      </type>
      <type>
        <code value="Range"/>
      </type>
      <type>
        <code value="Ratio"/>
      </type>
      <type>
        <code value="Reference"/>
      </type>
      <type>
        <code value="SampledData"/>
      </type>
      <type>
        <code value="Signature"/>
      </type>
      <type>
        <code value="Timing"/>
      </type>
      <type>
        <code value="Meta"/>
      </type>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
  </snapshot>
  <differential>
    <element id="Extension:whathashappenedovertime">
      <path value="Extension"/>
      <short value="What has happened over time"/>
      <definition value="Information on changes made to the Value Set Definition over time, and also has a contained
       audit trail of all such changes."/>
      <min value="0"/>
      <max value="*"/>
      <isModifier value="false"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:name">
      <path value="Extension.extension"/>
      <name value="name"/>
      <short value="The name of this set of history entries"/>
      <definition value="Label for a set of entries, such as a version."/>
      <comments value="Typically, a value set will have a set of history entries for each major publication milestone."/>
      <min value="0"/>
      <max value="1"/>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:name.extension:extension">
      <path value="Extension.extension.extension"/>
      <name value="extension"/>
      <max value="0"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:name.url">
      <path value="Extension.extension.url"/>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="name"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:name.value[x]">
      <path value="Extension.extension.value[x]"/>
      <min value="1"/>
      <type>
        <code value="string"/>
      </type>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision">
      <path value="Extension.extension"/>
      <name value="revision"/>
      <short value="Audit of all changes for a history entry"/>
      <definition value="A list of specific changes, who made them and when."/>
      <min value="0"/>
      <max value="*"/>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:date">
      <path value="Extension.extension.extension"/>
      <name value="date"/>
      <short value="Date the change was made"/>
      <definition value="Date the change took place."/>
      <min value="1"/>
      <max value="1"/>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:date.extension:extension">
      <path value="Extension.extension.extension.extension"/>
      <name value="extension"/>
      <max value="0"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:date.url">
      <path value="Extension.extension.extension.url"/>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="date"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:date.value[x]">
      <path value="Extension.extension.extension.value[x]"/>
      <min value="1"/>
      <type>
        <code value="dateTime"/>
      </type>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:id">
      <path value="Extension.extension.extension"/>
      <name value="id"/>
      <short value="Version marker after the change was made"/>
      <definition value="Unique id for the specific change."/>
      <min value="1"/>
      <max value="1"/>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:id.extension:extension">
      <path value="Extension.extension.extension.extension"/>
      <name value="extension"/>
      <max value="0"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:id.url">
      <path value="Extension.extension.extension.url"/>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="id"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:id.value[x]">
      <path value="Extension.extension.extension.value[x]"/>
      <min value="1"/>
      <type>
        <code value="string"/>
      </type>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:author">
      <path value="Extension.extension.extension"/>
      <name value="author"/>
      <short value="Who made the change"/>
      <definition value="Person or device responsible for the change."/>
      <min value="1"/>
      <max value="1"/>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:author.extension:extension">
      <path value="Extension.extension.extension.extension"/>
      <name value="extension"/>
      <max value="0"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:author.url">
      <path value="Extension.extension.extension.url"/>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="author"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:author.value[x]">
      <path value="Extension.extension.extension.value[x]"/>
      <min value="1"/>
      <type>
        <code value="string"/>
      </type>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:notes">
      <path value="Extension.extension.extension"/>
      <name value="notes"/>
      <short value="Information about the change"/>
      <definition value="Description of exactly what was changed and how."/>
      <min value="0"/>
      <max value="1"/>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:notes.extension:extension">
      <path value="Extension.extension.extension.extension"/>
      <name value="extension"/>
      <max value="0"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:notes.url">
      <path value="Extension.extension.extension.url"/>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="notes"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.extension:notes.value[x]">
      <path value="Extension.extension.extension.value[x]"/>
      <min value="1"/>
      <type>
        <code value="string"/>
      </type>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.url">
      <path value="Extension.extension.url"/>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="revision"/>
    </element>
    <element id="Extension:whathashappenedovertime.extension:revision.value[x]">
      <path value="Extension.extension.value[x]"/>
      <min value="0"/>
      <max value="0"/>
    </element>
    <element id="Extension:whathashappenedovertime.url">
      <path value="Extension.url"/>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="http://hl7.org/fhir/StructureDefinition/codesystem-history"/>
    </element>
    <element id="Extension:whathashappenedovertime.value[x]">
      <path value="Extension.value[x]"/>
      <min value="0"/>
      <max value="0"/>
    </element>
  </differential>
</StructureDefinition>
Usage note: every effort has been made to ensure that the examples are correct and useful, but they are not a normative part of the specification.