<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="valueset-expand-group" />
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="vocab" />
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="1" />
  </extension>
  <url value="http://hl7.org/fhir/StructureDefinition/valueset-expand-group" />
  <version value="4.0.1" />
  <name value="expand-group" />
  <status value="draft" />
  <date value="2019-11-01T09:29:23+11:00" />
  <publisher value="HL7" />
  <description value="This extension declares a group of concepts that is generated into the ValueSet.expansion.contains hierarchy when the expansion is generated for a UI. THere is no inherent assigned meaning to the hierarchy; it is used to help the user navigate the concepts. Each group has a display and/or a code, and a list of members, which are either concepts in the value set, or other groups (by code)." />
  <fhirVersion value="4.0.1" />
  <mapping>
    <identity value="rim" />
    <uri value="http://hl7.org/v3" />
    <name value="RIM Mapping" />
  </mapping>
  <kind value="complex-type" />
  <abstract value="false" />
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <snapshot>
    <element id="Extension">
      <path value="Extension" />
      <short value="Defines a hierarchy structure (when in UI mode)" />
      <definition value="This extension declares a group of concepts that is generated into the ValueSet.expansion.contains hierarchy when the expansion is generated for a UI. THere is no inherent assigned meaning to the hierarchy; it is used to help the user navigate the concepts. Each group has a display and/or a code, and a list of members, which are either concepts in the value set, or other groups (by code)." />
      <comment value="Note that there are inter-relationships between concept status/properties and the way the groups are built; these are described and documented in the (value set hierarchical example)[d.html]. Note that this extension should be ignored when the expansion is not generated for UI." />
      <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="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(.), 'value')])" />
        <source value="http://hl7.org/fhir/StructureDefinition/Extension" />
      </constraint>
      <isModifier value="false" />
    </element>
    <element id="Extension.id">
      <path value="Extension.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>
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
    </element>
    <element id="Extension.extension">
      <path value="Extension.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 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(.), &quot;value&quot;)])" />
        <source value="http://hl7.org/fhir/StructureDefinition/Extension" />
      </constraint>
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
    </element>
    <element id="Extension.extension:code">
      <path value="Extension.extension" />
      <sliceName value="code" />
      <short value="Underlying code from the system" />
      <definition value="A reference to a code from the include.system that defines the meaning associated with the group. Note that including the code in this extension does not include the code in the value set; if the code is intended to be in the value set, it must be listed directly as well." />
      <comment value="If there is no code, the group purely exists for display, and has no underlying meaning." />
      <min value="0" />
      <max value="1" />
      <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(.), &quot;value&quot;)])" />
        <source value="http://hl7.org/fhir/StructureDefinition/Extension" />
      </constraint>
      <isModifier value="false" />
      <isSummary value="false" />
    </element>
    <element id="Extension.extension:code.id">
      <path value="Extension.extension.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>
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
    </element>
    <element id="Extension.extension:code.extension">
      <path value="Extension.extension.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="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>
      <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(.), &quot;value&quot;)])" />
        <source value="http://hl7.org/fhir/StructureDefinition/Extension" />
      </constraint>
      <isModifier value="false" />
      <isSummary value="false" />
    </element>
    <element id="Extension.extension:code.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." />
      <comment 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="code" />
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
    <element id="Extension.extension:code.value[x]">
      <path value="Extension.extension.value[x]" />
      <short value="Value of extension" />
      <definition value="Value of extension - must be one of a constrained set of the data types (see [Extensibility](http://hl7.org/fhir/extensibility.html) for a list)." />
      <min value="1" />
      <max value="1" />
      <base>
        <path value="Extension.value[x]" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="code" />
      </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>
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
    <element id="Extension.extension:display">
      <path value="Extension.extension" />
      <sliceName value="display" />
      <short value="Display for the group" />
      <definition value="The description for the group (goes in ValueSet.expansion.contains.dispaly). All groups need a display; this can only be omitted if there is a code that can be used to determine the display." />
      <min value="0" />
      <max value="1" />
      <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(.), &quot;value&quot;)])" />
        <source value="http://hl7.org/fhir/StructureDefinition/Extension" />
      </constraint>
      <isModifier value="false" />
      <isSummary value="false" />
    </element>
    <element id="Extension.extension:display.id">
      <path value="Extension.extension.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>
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
    </element>
    <element id="Extension.extension:display.extension">
      <path value="Extension.extension.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="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>
      <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(.), &quot;value&quot;)])" />
        <source value="http://hl7.org/fhir/StructureDefinition/Extension" />
      </constraint>
      <isModifier value="false" />
      <isSummary value="false" />
    </element>
    <element id="Extension.extension:display.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." />
      <comment 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="display" />
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
    <element id="Extension.extension:display.value[x]">
      <path value="Extension.extension.value[x]" />
      <short value="Value of extension" />
      <definition value="Value of extension - must be one of a constrained set of the data types (see [Extensibility](http://hl7.org/fhir/extensibility.html) for a 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>
      <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" />
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
    <element id="Extension.extension:member">
      <path value="Extension.extension" />
      <sliceName value="member" />
      <short value="Codes or other groups in this group" />
      <definition value="One of more codes that identify codes in the expansion or other groups." />
      <comment value="A group without a code can be included by giving it an id and using #[id] in place of the code." />
      <min value="1" />
      <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(.), &quot;value&quot;)])" />
        <source value="http://hl7.org/fhir/StructureDefinition/Extension" />
      </constraint>
      <isModifier value="false" />
      <isSummary value="false" />
    </element>
    <element id="Extension.extension:member.id">
      <path value="Extension.extension.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>
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
    </element>
    <element id="Extension.extension:member.extension">
      <path value="Extension.extension.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="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>
      <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(.), &quot;value&quot;)])" />
        <source value="http://hl7.org/fhir/StructureDefinition/Extension" />
      </constraint>
      <isModifier value="false" />
      <isSummary value="false" />
    </element>
    <element id="Extension.extension:member.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." />
      <comment 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="member" />
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
    <element id="Extension.extension:member.value[x]">
      <path value="Extension.extension.value[x]" />
      <short value="Value of extension" />
      <definition value="Value of extension - must be one of a constrained set of the data types (see [Extensibility](http://hl7.org/fhir/extensibility.html) for a list)." />
      <min value="1" />
      <max value="1" />
      <base>
        <path value="Extension.value[x]" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="code" />
      </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>
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
    <element id="Extension.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." />
      <comment 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>
        <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type">
          <valueUrl value="uri" />
        </extension>
        <code value="http://hl7.org/fhirpath/System.String" />
      </type>
      <fixedUri value="http://hl7.org/fhir/StructureDefinition/valueset-expand-group" />
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
    <element id="Extension.value[x]">
      <path value="Extension.value[x]" />
      <short value="Value of extension" />
      <definition value="Value of extension - must be one of a constrained set of the data types (see [Extensibility](http://hl7.org/fhir/extensibility.html) for a 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="canonical" />
      </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="url" />
      </type>
      <type>
        <code value="uuid" />
      </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="ContactDetail" />
      </type>
      <type>
        <code value="Contributor" />
      </type>
      <type>
        <code value="DataRequirement" />
      </type>
      <type>
        <code value="Expression" />
      </type>
      <type>
        <code value="ParameterDefinition" />
      </type>
      <type>
        <code value="RelatedArtifact" />
      </type>
      <type>
        <code value="TriggerDefinition" />
      </type>
      <type>
        <code value="UsageContext" />
      </type>
      <type>
        <code value="Dosage" />
      </type>
      <type>
        <code value="Meta" />
      </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>
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
  </snapshot>
  <differential>
    <element id="Extension">
      <path value="Extension" />
      <short value="Defines a hierarchy structure (when in UI mode)" />
      <definition value="This extension declares a group of concepts that is generated into the ValueSet.expansion.contains hierarchy when the expansion is generated for a UI. THere is no inherent assigned meaning to the hierarchy; it is used to help the user navigate the concepts. Each group has a display and/or a code, and a list of members, which are either concepts in the value set, or other groups (by code)." />
      <comment value="Note that there are inter-relationships between concept status/properties and the way the groups are built; these are described and documented in the (value set hierarchical example)[d.html]. Note that this extension should be ignored when the expansion is not generated for UI." />
      <min value="0" />
      <max value="*" />
      <isModifier value="false" />
    </element>
    <element id="Extension.extension:code">
      <path value="Extension.extension" />
      <sliceName value="code" />
      <short value="Underlying code from the system" />
      <definition value="A reference to a code from the include.system that defines the meaning associated with the group. Note that including the code in this extension does not include the code in the value set; if the code is intended to be in the value set, it must be listed directly as well." />
      <comment value="If there is no code, the group purely exists for display, and has no underlying meaning." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="Extension" />
      </type>
    </element>
    <element id="Extension.extension:code.extension">
      <path value="Extension.extension.extension" />
      <max value="0" />
    </element>
    <element id="Extension.extension:code.url">
      <path value="Extension.extension.url" />
      <type>
        <code value="uri" />
      </type>
      <fixedUri value="code" />
    </element>
    <element id="Extension.extension:code.value[x]">
      <path value="Extension.extension.value[x]" />
      <min value="1" />
      <type>
        <code value="code" />
      </type>
    </element>
    <element id="Extension.extension:display">
      <path value="Extension.extension" />
      <sliceName value="display" />
      <short value="Display for the group" />
      <definition value="The description for the group (goes in ValueSet.expansion.contains.dispaly). All groups need a display; this can only be omitted if there is a code that can be used to determine the display." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="Extension" />
      </type>
    </element>
    <element id="Extension.extension:display.extension">
      <path value="Extension.extension.extension" />
      <max value="0" />
    </element>
    <element id="Extension.extension:display.url">
      <path value="Extension.extension.url" />
      <type>
        <code value="uri" />
      </type>
      <fixedUri value="display" />
    </element>
    <element id="Extension.extension:display.value[x]">
      <path value="Extension.extension.value[x]" />
      <min value="1" />
      <type>
        <code value="string" />
      </type>
    </element>
    <element id="Extension.extension:member">
      <path value="Extension.extension" />
      <sliceName value="member" />
      <short value="Codes or other groups in this group" />
      <definition value="One of more codes that identify codes in the expansion or other groups." />
      <comment value="A group without a code can be included by giving it an id and using #[id] in place of the code." />
      <min value="1" />
      <max value="*" />
      <type>
        <code value="Extension" />
      </type>
    </element>
    <element id="Extension.extension:member.extension">
      <path value="Extension.extension.extension" />
      <max value="0" />
    </element>
    <element id="Extension.extension:member.url">
      <path value="Extension.extension.url" />
      <type>
        <code value="uri" />
      </type>
      <fixedUri value="member" />
    </element>
    <element id="Extension.extension:member.value[x]">
      <path value="Extension.extension.value[x]" />
      <min value="1" />
      <type>
        <code value="code" />
      </type>
    </element>
    <element id="Extension.url">
      <path value="Extension.url" />
      <fixedUri value="http://hl7.org/fhir/StructureDefinition/valueset-expand-group" />
    </element>
    <element id="Extension.value[x]">
      <path value="Extension.value[x]" />
      <min value="0" />
      <max value="0" />
    </element>
  </differential>
</StructureDefinition>