StructureDefinition for Count

<?xml version="1.0" encoding="UTF-8"?>


        
          
            
            
               Documentation for this format
            
          
        
      
    
  
  
  
  
  
  
  
    
      
      
    
  
  
  Need to able to capture all sorts of measured values, even if the measured value are not
   precisely quantified. Values include exact measures such as 3.51g, customary units such
   as 3 tablets, and currencies such as $100.32USD.
  
  
    
    
    
  
  
    
    
    
  
  
  
  
  
  
  
    
      
      

<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="Count"/> 
  <text> 
    <status value="generated"/> 
    <div xmlns="http://www.w3.org/1999/xhtml">
      <table border="0" cellpadding="0" cellspacing="0" style="border: 0px #F0F0F0 solid; font-size: 11px; font-family: verdana; vertical-align:
       top;">
        <tr style="border: 1px #F0F0F0 solid; font-size: 11px; font-family: verdana; vertical-align:

         top">
          <th class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;

           border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom:
           3px">
            <a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="The logical name of the element">Name</a>           </th>           <th class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;

           border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom:
           3px">
            <a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Information about the use of the element">Flags</a>           </th>           <th class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;

           border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom:
           3px">
            <a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Minimum and Maximum # of times the element can appear in the instance">Card.</a>           </th>           <th class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;

           border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom:
           3px; width: 100px">
            <a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Reference to the type of the element">Type</a>           </th>           <th class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;

           border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom:
           3px">
            <a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Additional information about the element">Description &amp; Constraints</a>             <span style="float: right">              <a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Legend for this format">                <img alt="doco" src="data:(snipped in html view)" style="background-color: inherit"/>               </a>             </span>           </th>         </tr>         <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color:

         white">
          <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;

           border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image:
           url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAyAAAAACCAYAAACg/LjIAAAAJUlEQVR4Xu3IIQEAAAg
          DsHd9/w4EQIOamFnaBgAA4MMKAACAKwNp30CqZFfFmwAAAABJRU5ErkJggg==)">
            <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/>             <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: white; background-color: inherit" title="Data Type"/>              <a href="datatypes-definitions.html#Count" title="Count : 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.">Count</a> 
          </td>           <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;

           border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
            <a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; null; padding-left: 3px; padding-right:

             3px; color: black; null" title="This element is included in summaries">Σ</a> 
            <a href="versions.html#std-process" style="padding-left: 3px; padding-right: 3px; border: 1px grey solid; font-weight: bold;

             color: black; background-color: #e6ffe6; padding-left: 3px; padding-right: 3px;
             border: 1px grey solid; font-weight: bold; color: black; background-color: #e6ffe6" title="Standards Status = Normative">N</a> 
          </td>           <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;

           border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px"/> 
          <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;

           border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
            <a href="datatypes.html#Quantity">Quantity</a>           </td>           <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;

           border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">A measured or measurable amount
            <br/>              <span style="font-style: italic" title="cnt-3">+ Rule: There SHALL be a code with a value of &quot;1&quot; if there is a value.

               If system is present, it SHALL be UCUM.  If present, the value SHALL be a whole
               number.</span> 
            <br/>              <br/>  Elements defined in Ancestors:             <a href="types.html#Element" title="Unique id for the element within a resource (for internal references). This may

             be any string value that does not contain spaces.">id</a> , 
            <a href="types.html#Element" title="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 managable, 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.">extension</a> , 
            <a href="datatypes.html#Quantity" title="The value of the measured amount. The value includes an implicit precision in the

             presentation of the value.">value</a> , 
            <a href="datatypes.html#Quantity" title="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.">comparator</a> , 
            <a href="datatypes.html#Quantity" title="A human-readable form of the unit.">unit</a> ,             <a href="datatypes.html#Quantity" title="The identification of the system that provides the coded form of the unit.">system</a> ,             <a href="datatypes.html#Quantity" title="A computer processable form of the unit in some unit representation system.">code</a>           </td>         </tr>         <tr>           <td class="hierarchy" colspan="5">            <br/>              <a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Legend for this format">              <img alt="doco" src="data:(snipped in html view)" style="background-color: inherit"/>  Documentation for this format            </a>           </td>         </tr>       </table>     </div>   </text>   <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status">    <valueCode value="normative"/>   </extension>   <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-type-characteristics">    <valueCode value="has-range"/>   </extension>   <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">    <valueCode value="fhir"/>   </extension>   <url value="http://hl7.org/fhir/StructureDefinition/Count"/>   <version value="6.0.0-ballot3"/>   <name value="Count"/>   <status value="active"/>   <experimental value="false"/>   <date value="2025-12-17T09:50:17+00:00"/>   <publisher value="HL7 International / FHIR Infrastructure"/>   <contact>     <telecom>       <system value="url"/>       <value value="http://hl7.org/fhir"/>     </telecom>   </contact>   <contact>     <telecom>       <system value="url"/>       <value value="http://www.hl7.org/Special/committees/fiwg"/>     </telecom>   </contact>   <description value="Count Type: 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."/> 
  <jurisdiction>     <coding>       <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/>       <code value="001"/>       <display value="World"/>     </coding>   </jurisdiction>   <purpose value="Need to able to capture all sorts of measured values, even if the measured value

   are not precisely quantified. Values include exact measures such as 3.51g, customary
   units such as 3 tablets, and currencies such as $100.32USD."/> 
  <fhirVersion value="6.0.0-ballot3"/>   <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="Count"/>   <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Quantity"/>   <derivation value="specialization"/>   <snapshot>     <element id="Count">      <path value="Count"/>       <short value="A measured or measurable amount"/> 
      <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.
      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.
      
      
      
        
        
        
        
        
        
      
      
        
        
        There SHALL be a code with a value of &quot;1&quot; if there is a value and it SHALL be
         an expression of length.  If system is present, it SHALL be UCUM.  If present, the value
         SHALL a whole number.
        (code or value.empty()) and (system.empty() or system = %ucum) and (code.empty() or code
         = '1') and (value.empty() or value.toString().contains('.').not())
        (f:code or not(f:value)) and (not(exists(f:system)) or (f:system/@value='http://unitsofmeasure.org'
         and f:code/@value='1')) and not(contains(f:value/@value, '.'))
      
      
        
        
      
      
        
        
      
    
    
      
      
      
      unique id for the element within a resource (for internal references). This may be any
       string value that does not contain spaces.
      
      
      
        
        
        
      
      
        
      
      
        
        
      
    
    
      
      
        
          
          
        
        
        
      
      

       arbitrary units and floating currencies."/> 
      <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="Count"/>         <min value="0"/>         <max value="*"/>       </base>       <constraint>         <key value="cnt-3"/>         <severity value="error"/>         <human value="There SHALL be a code with a value of &quot;1&quot; if there is a value. If system

         is present, it SHALL be UCUM.  If present, the value SHALL be a whole number."/> 
        <expression value="(code.exists() or value.empty()) and (system.empty() or system = %ucum) and (code.empty()

         or code = '1') and (value.empty() or value.hasValue().not() or value.toString().contains('.')
        .not()) and (value.empty() or value.hasValue().not() or value &gt;= 0)"/> 
        <source value="http://hl7.org/fhir/StructureDefinition/Count"/>       </constraint>       <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())"/>         <source value="http://hl7.org/fhir/StructureDefinition/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()"/>         <source value="http://hl7.org/fhir/StructureDefinition/Quantity"/>       </constraint>       <constraint>         <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bestpractice">          <valueBoolean value="true"/>         </extension>         <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bestpractice-explanation">          <valueMarkdown value="UCUM Codes that contain human readable annotations like {Z-Score} can be misleading.

           Best Practice is not to use annotations in the UCUM code, and rather to make sure
           that Quantity.unit is correctly human readable"/> 
        </extension>         <key value="qty-4"/>         <severity value="warning"/>         <human value="Processing UCUM codes with annotations ({..}) can be misleading."/>         <expression value="code.exists() implies code.matches('\\{.*?\\}').not()"/>         <source value="http://hl7.org/fhir/StructureDefinition/Quantity"/>       </constraint>       <isModifier value="false"/>       <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="Count.id">      <path value="Count.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>       <!--  Note: special primitive values have a FHIRPath system type. e.g. this is compiler

       magic (j)  -->
      <type>         <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type">          <valueUrl value="string"/>         </extension>         <code value="http://hl7.org/fhirpath/System.String"/>       </type>       <condition value="ele-1"/>       <isModifier value="false"/>       <isSummary value="false"/>       <mapping>         <identity value="rim"/>         <map value="n/a"/>       </mapping>     </element>     <element id="Count.extension">      <path value="Count.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. In order 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 is allowed to define an extension, there is a set of requirements that SHALL
       be met as part of the definition of the extension.
      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.
      
      
      
      
      
        
        
        
      
      
        
      
      
        
        
      
    
    
      
      
      The value of the measured amount. The value includes an implicit precision in the presentation
       of the 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).
      
      
      
      
        
        
        
      
      
        
      
      
      
        
        
      
      
        
        
      
    
    
      
      
      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.
      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.
      Need a framework for handling measures where the value is &lt;5ug/L or &gt;400mg/L due
       to the limitations of measuring methodology.
      
      
      
        
        
        
      
      
        
      
      
      
      
      
        
          
        
        
        
        
          
        
      
      
        
        
      
      
        
        
      
    
    
      
        
      
      
      
      
      There are many representations for units of measure and in many contexts, particular representations
       are fixed and required. I.e. mcg for micrograms.
      
      
      
        
        
        
      
      
        
      
      
      
        
        
      
      
        
        
      
    
    
      
      
      
      
      
      
      
        
        
        
      
      
        
      
      
      
      
        
        
      
      
        
        
      
    
    
      
      
      
      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.
      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.
      
      
      
        
        
        
      
      
        
      
      
      
        
        
      
      
        
        
      
    
  
  
    
      
      

       of the element. To make the use of extensions safe and managable, 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())"/>         <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="Count.value">      <path value="Count.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>       <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())"/>         <source value="http://hl7.org/fhir/StructureDefinition/Element"/>       </constraint>       <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="Count.comparator">      <path value="Count.comparator"/>       <short value="&lt; | &lt;= | &gt;= | &gt; | ad - 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"/>       <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())"/>         <source value="http://hl7.org/fhir/StructureDefinition/Element"/>       </constraint>       <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/tools/StructureDefinition/binding-definition">          <valueMarkdown value="How the Quantity should be understood and represented."/>         </extension>         <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|6.0.0-ballot3"/>       </binding>       <mapping>         <identity value="v2"/>         <map value="SN.1  / CQ.1"/>       </mapping>       <mapping>         <identity value="rim"/>         <map value="IVL properties"/>       </mapping>     </element>     <element id="Count.unit">      <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">        <valueBoolean value="true"/>       </extension>       <path value="Count.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>       <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())"/>         <source value="http://hl7.org/fhir/StructureDefinition/Element"/>       </constraint>       <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="Count.system">      <path value="Count.system"/>       <short value="System that defines coded unit form"/>       <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="0"/>       <max value="1"/>       <base>         <path value="Quantity.system"/>         <min value="0"/>         <max value="1"/>       </base>       <type>         <code value="uri"/>       </type>       <condition value="qty-3"/>       <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())"/>         <source value="http://hl7.org/fhir/StructureDefinition/Element"/>       </constraint>       <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="Count.code">      <extension url="http://hl7.org/fhir/tools/StructureDefinition/no-binding">        <valueBoolean value="true"/>       </extension>       <path value="Count.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="0"/>       <max value="1"/>       <base>         <path value="Quantity.code"/>         <min value="0"/>         <max value="1"/>       </base>       <type>         <code value="code"/>       </type>       <condition value="qty-3"/>       <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())"/>         <source value="http://hl7.org/fhir/StructureDefinition/Element"/>       </constraint>       <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="Count">      <path value="Count"/>       <short value="A measured or measurable amount"/> 
      <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.
      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.
      
      
      
        
        
        There SHALL be a code with a value of &quot;1&quot; if there is a value and it SHALL be
         an expression of length.  If system is present, it SHALL be UCUM.  If present, the value
         SHALL a whole number.
        (code or value.empty()) and (system.empty() or system = %ucum) and (code.empty() or code
         = '1') and (value.empty() or value.toString().contains('.').not())
        (f:code or not(f:value)) and (not(exists(f:system)) or (f:system/@value='http://unitsofmeasure.org'
         and f:code/@value='1')) and not(contains(f:value/@value, '.'))
      
      
        
        
      
      
        
        
      
    
  

       arbitrary units and floating currencies."/> 
      <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="*"/>       <constraint>         <key value="cnt-3"/>         <severity value="error"/>         <human value="There SHALL be a code with a value of &quot;1&quot; if there is a value. If system

         is present, it SHALL be UCUM.  If present, the value SHALL be a whole number."/> 
        <expression value="(code.exists() or value.empty()) and (system.empty() or system = %ucum) and (code.empty()

         or code = '1') and (value.empty() or value.hasValue().not() or value.toString().contains('.')
        .not()) and (value.empty() or value.hasValue().not() or value &gt;= 0)"/> 
        <source value="http://hl7.org/fhir/StructureDefinition/Count"/>       </constraint>       <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>   </differential> 


</

StructureDefinition

>