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<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="Quantity-uv-ips" />
  <text>
    <status value="generated" />
    <div xmlns="http://www.w3.org/1999/xhtml">This profile of the Quantity datatype imposes the usage of the UCUM code system for units</div>
  </text>
  <url value="http://hl7.org/fhir/uv/ips/StructureDefinition/Quantity-uv-ips" />
  <version value="0.2.0" />
  <name value="Quantity_uv_ips" />
  <title value="Quantity" />
  <status value="draft" />
  <date value="2018-03-20T16:17:13+00:00" />
  <publisher value="HL7 International" />
  <description value="Datatype Quantity constrianed to use the UCUM units" />
  <jurisdiction>
    <coding>
      <system value="http://unstats.un.org/unsd/methods/m49/m49.htm" />
      <code value="001" />
      <display value="World" />
    </coding>
  </jurisdiction>
  <purpose value="This profile of the Quantity datatype imposes the usage of the UCUM code system for units" />
  <fhirVersion value="4.0.0" />
  <mapping>
    <identity value="v2" />
    <uri value="http://hl7.org/v2" />
    <name value="HL7 v2 Mapping" />
  </mapping>
  <mapping>
    <identity value="rim" />
    <uri value="http://hl7.org/v3" />
    <name value="RIM Mapping" />
  </mapping>
  <kind value="complex-type" />
  <abstract value="false" />
  <type value="Quantity" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Quantity" />
  <derivation value="constraint" />
  <snapshot>
    <element id="Quantity">
      <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status">
        <valueCode value="normative" />
      </extension>
      <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-normative-version">
        <valueCode value="4.0.0" />
      </extension>
      <path value="Quantity" />
      <short value="A measured amount using UCUM" />
      <definition value="A measured amount (or an amount that can potentially be measured). Note that measured amounts include amounts that are not precisely quantified, including amounts involving arbitrary units and floating currencies.&#xD;&#xA;This profile imposes that the code system for unit be UCUM" />
      <comment value="The context of use may frequently define what kind of quantity this is and therefore what kind of units can be used. The context of use may also restrict the values for the comparator." />
      <min value="0" />
      <max value="*" />
      <base>
        <path value="Quantity" />
        <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="Element" />
      </constraint>
      <constraint>
        <key value="qty-3" />
        <severity value="error" />
        <human value="If a code for the unit is present, the system SHALL also be present" />
        <expression value="code.empty() or system.exists()" />
        <xpath value="not(exists(f:code)) or exists(f:system)" />
        <source value="Quantity" />
      </constraint>
      <mustSupport value="true" />
      <isModifier value="false" />
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
      <mapping>
        <identity value="v2" />
        <map value="SN (see also Range) or CQ" />
      </mapping>
      <mapping>
        <identity value="rim" />
        <map value="PQ, IVL&lt;PQ&gt;, MO, CO, depending on the values" />
      </mapping>
    </element>
    <element id="Quantity.id">
      <path value="Quantity.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>
        <code value="string" />
      </type>
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
    </element>
    <element id="Quantity.extension">
      <path value="Quantity.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>
      <isModifier value="false" />
      <isSummary value="false" />
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
    </element>
    <element id="Quantity.value">
      <path value="Quantity.value" />
      <short value="Numerical value (with implicit precision)" />
      <definition value="The value of the measured amount. The value includes an implicit precision in the presentation of the value." />
      <comment value="The implicit precision in the value should always be honored. Monetary values have their own rules for handling precision (refer to standard accounting text books)." />
      <requirements value="Precision is handled implicitly in almost all cases of measurement." />
      <min value="0" />
      <max value="1" />
      <base>
        <path value="Quantity.value" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="decimal" />
      </type>
      <isModifier value="false" />
      <isSummary value="true" />
      <mapping>
        <identity value="v2" />
        <map value="SN.2  / CQ - N/A" />
      </mapping>
      <mapping>
        <identity value="rim" />
        <map value="PQ.value, CO.value, MO.value, IVL.high or IVL.low depending on the value" />
      </mapping>
    </element>
    <element id="Quantity.comparator">
      <path value="Quantity.comparator" />
      <short value="&lt; | &lt;= | &gt;= | &gt; - how to understand the value" />
      <definition value="How the value should be understood and represented - whether the actual value is greater or less than the stated value due to measurement issues; e.g. if the comparator is &quot;&lt;&quot; , then the real value is &lt; stated value." />
      <requirements value="Need a framework for handling measures where the value is &lt;5ug/L or &gt;400mg/L due to the limitations of measuring methodology." />
      <min value="0" />
      <max value="1" />
      <base>
        <path value="Quantity.comparator" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="code" />
      </type>
      <meaningWhenMissing value="If there is no comparator, then there is no modification of the value" />
      <isModifier value="true" />
      <isModifierReason value="This is labeled as &quot;Is Modifier&quot; because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value" />
      <isSummary value="true" />
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="QuantityComparator" />
        </extension>
        <strength value="required" />
        <description value="How the Quantity should be understood and represented." />
        <valueSet value="http://hl7.org/fhir/ValueSet/quantity-comparator|4.0.0" />
      </binding>
      <mapping>
        <identity value="v2" />
        <map value="SN.1  / CQ.1" />
      </mapping>
      <mapping>
        <identity value="rim" />
        <map value="IVL properties" />
      </mapping>
    </element>
    <element id="Quantity.unit">
      <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">
        <valueBoolean value="true" />
      </extension>
      <path value="Quantity.unit" />
      <short value="Unit representation" />
      <definition value="A human-readable form of the unit." />
      <requirements value="There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms." />
      <min value="0" />
      <max value="1" />
      <base>
        <path value="Quantity.unit" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="string" />
      </type>
      <isModifier value="false" />
      <isSummary value="true" />
      <mapping>
        <identity value="v2" />
        <map value="(see OBX.6 etc.) / CQ.2" />
      </mapping>
      <mapping>
        <identity value="rim" />
        <map value="PQ.unit" />
      </mapping>
    </element>
    <element id="Quantity.system">
      <path value="Quantity.system" />
      <short value="UCUM system for units" />
      <definition value="The identification of the system that provides the coded form of the unit." />
      <requirements value="Need to know the system that defines the coded form of the unit." />
      <min value="1" />
      <max value="1" />
      <base>
        <path value="Quantity.system" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="uri" />
      </type>
      <fixedUri value="http://unitsofmeasure.org" />
      <condition value="qty-3" />
      <mustSupport value="true" />
      <isModifier value="false" />
      <isSummary value="true" />
      <mapping>
        <identity value="v2" />
        <map value="(see OBX.6 etc.) / CQ.2" />
      </mapping>
      <mapping>
        <identity value="rim" />
        <map value="CO.codeSystem, PQ.translation.codeSystem" />
      </mapping>
    </element>
    <element id="Quantity.code">
      <path value="Quantity.code" />
      <short value="Coded form of the unit" />
      <definition value="A computer processable form of the unit in some unit representation system." />
      <comment value="The preferred system is UCUM, but SNOMED CT can also be used (for customary units) or ISO 4217 for currency.  The context of use may additionally require a code from a particular system." />
      <requirements value="Need a computable form of the unit that is fixed across all forms. UCUM provides this for quantities, but SNOMED CT provides many units of interest." />
      <min value="1" />
      <max value="1" />
      <base>
        <path value="Quantity.code" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="code" />
      </type>
      <mustSupport value="true" />
      <isModifier value="false" />
      <isSummary value="true" />
      <mapping>
        <identity value="v2" />
        <map value="(see OBX.6 etc.) / CQ.2" />
      </mapping>
      <mapping>
        <identity value="rim" />
        <map value="PQ.code, MO.currency, PQ.translation.code" />
      </mapping>
    </element>
  </snapshot>
  <differential>
    <element id="Quantity">
      <path value="Quantity" />
      <short value="A measured amount using UCUM" />
      <definition value="A measured amount (or an amount that can potentially be measured). Note that measured amounts include amounts that are not precisely quantified, including amounts involving arbitrary units and floating currencies.&#xD;&#xA;This profile imposes that the code system for unit be UCUM" />
      <mustSupport value="true" />
    </element>
    <element id="Quantity.system">
      <path value="Quantity.system" />
      <short value="UCUM system for units" />
      <min value="1" />
      <fixedUri value="http://unitsofmeasure.org" />
      <mustSupport value="true" />
    </element>
    <element id="Quantity.code">
      <path value="Quantity.code" />
      <min value="1" />
      <mustSupport value="true" />
    </element>
  </differential>
</StructureDefinition>

name : Quantity_uv_ips

{

}