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<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="questionnaire-unit" />
  <url value="http://hl7.org/fhir/StructureDefinition/questionnaire-unit" />
  <name value="Unit for numeric answer" />
  <status value="draft" />
  <experimental value="false" />
  <publisher value="HL7" />
  <contact>
    <telecom>
      <system value="other" />
      <value value="http://www.hl7.org" />
      <rank value="1" />
    </telecom>
  </contact>
  <description value="Provides a computable unit of measure associated with numeric questions to support subsequent computation on responses." />
  <fhirVersion value="1.6.0" />
  <mapping>
    <identity value="rim" />
    <uri value="http://hl7.org/v3" />
    <name value="RIM" />
  </mapping>
  <kind value="datatype" />
  <abstract value="false" />
  <contextType value="resource" />
  <context value="Questionnaire.item" />
  <context value="Questionnaire.item.item" />
  <baseType value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <snapshot>
    <element>
      <path value="Extension" />
      <short value="Unit for numeric answer" />
      <definition value="Provides a computable unit of measure associated with numeric questions to support subsequent computation on responses." />
      <comments value="The human-readable unit is conveyed as a display element.  This element is for computation purposes." />
      <min value="0" />
      <max value="1" />
      <base>
        <path value="Extension" />
        <min value="0" />
        <max value="*" />
      </base>
      <maxLength value="0" />
      <constraint>
        <key value="inv-16" />
        <severity value="error" />
        <human value="Lookup Questionnaire can only be specified for questions with a type of &quot;integer&quot; or &quot;decimal&quot;" />
        <expression value="$parent.type='integer' or $parent.type='decimal'" />
        <xpath value="parent::*/f:type/@value=('integer', 'decimal')" />
      </constraint>
      <mustSupport value="false" />
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="N/A (MIF-level)" />
      </mapping>
    </element>
    <element>
      <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)." />
      <min value="0" />
      <max value="1" />
      <base>
        <path value="Element.id" />
        <min value="0" />
        <max value="*" />
      </base>
      <type>
        <code value="id" />
      </type>
      <maxLength value="0" />
      <mustSupport value="false" />
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
    </element>
    <element>
      <path value="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>
      <maxLength value="0" />
      <mustSupport value="false" />
      <isModifier value="false" />
      <isSummary value="false" />
    </element>
    <element>
      <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 should be version specific.  This will ideally be the URI for the Resource Profile defining the extension, with the code for the extension after a #." />
      <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/questionnaire-unit" />
      <maxLength value="0" />
      <mustSupport value="false" />
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
    <element>
      <path value="Extension.valueCoding" />
      <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="Coding" />
      </type>
      <maxLength value="0" />
      <mustSupport value="false" />
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
  </snapshot>
  <differential>
    <element>
      <path value="Extension" />
      <short value="Unit for numeric answer" />
      <definition value="Provides a computable unit of measure associated with numeric questions to support subsequent computation on responses." />
      <comments value="The human-readable unit is conveyed as a display element.  This element is for computation purposes." />
      <min value="0" />
      <max value="1" />
      <base>
        <path value="Extension" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="Extension" />
      </type>
      <maxLength value="0" />
      <constraint>
        <key value="inv-16" />
        <severity value="error" />
        <human value="Lookup Questionnaire can only be specified for questions with a type of &quot;integer&quot; or &quot;decimal&quot;" />
        <expression value="$parent.type='integer' or $parent.type='decimal'" />
        <xpath value="parent::*/f:type/@value=('integer', 'decimal')" />
      </constraint>
      <mustSupport value="false" />
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="N/A (MIF-level)" />
      </mapping>
    </element>
    <element>
      <path value="Extension.extension" />
      <name value="extension" />
      <min value="0" />
      <max value="0" />
      <base>
        <path value="Extension.extension" />
        <min value="0" />
        <max value="0" />
      </base>
      <maxLength value="0" />
      <mustSupport value="false" />
      <isModifier value="false" />
      <isSummary value="false" />
    </element>
    <element>
      <path value="Extension.url" />
      <min value="0" />
      <base>
        <path value="Extension.url" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="uri" />
      </type>
      <fixedUri value="http://hl7.org/fhir/StructureDefinition/questionnaire-unit" />
      <maxLength value="0" />
      <mustSupport value="false" />
      <isModifier value="false" />
      <isSummary value="false" />
    </element>
    <element>
      <path value="Extension.value[x]" />
      <min value="1" />
      <base>
        <path value="Extension.value[x]" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="Coding" />
      </type>
      <maxLength value="0" />
      <mustSupport value="false" />
      <isModifier value="false" />
      <isSummary value="false" />
    </element>
  </differential>
</StructureDefinition>

name : Unit for numeric answer

{

}

<name value="Unit for numeric answer" />