Count.profile.xml

StructureDefinition for Count

Raw XML

<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="Count"/>
  <text>
    <status value="generated"/>
    <div xmlns="http://www.w3.org/1999/xhtml"><!-- Snipped for brevity --></div>
  </text>
  <url value="http://hl7.org/fhir/StructureDefinition/Count"/>
  <name value="Count"/>
  <publisher value="HL7 FHIR Standard"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://hl7.org/fhir"/>
    </telecom>
  </contact>
  <description value="A count of a discrete element (no unit)"/>
  <status value="draft"/>
  <date value="2015-04-03T14:24:32+11:00"/>
  <type value="constraint"/>
  <abstract value="false"/>
  <base value="http://hl7.org/fhir/StructureDefinition/Quantity"/>
  <snapshot>
    <element>
      <path value="Quantity"/>
      <name value="Count"/>
      <short value="A count of a discrete element (no unit)"/>
      <definition value="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."/>
      <comments 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."/>
      <requirements 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."/>
      <min value="1"/>
      <max value="1"/>
      <type>
        <code value="Quantity"/>
      </type>
      <constraint>
        <key value="qty-3"/>
        <name value="SHALL have a system"/>
        <severity value="error"/>
        <human value="If a code for the units is present, the system SHALL also be present"/>
        <xpath value="not(exists(f:code)) or exists(f:system)"/>
      </constraint>
      <constraint>
        <key value="cnt-1"/>
        <severity value="error"/>
        <human value="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."/>
        <xpath value="(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, '.'))"/>
      </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>
    <element>
      <path value="Quantity.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"/>
      <type>
        <code value="id"/>
      </type>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element>
      <path value="Quantity.extension"/>
      <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."/>
      <comments 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="*"/>
      <type>
        <code value="Extension"/>
      </type>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element>
      <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."/>
      <comments 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"/>
      <type>
        <code value="decimal"/>
      </type>
      <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>
      <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."/>
      <comments 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."/>
      <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"/>
      <type>
        <code value="code"/>
      </type>
      <isModifier value="true"/>
      <binding>
        <name value="QuantityComparator"/>
        <strength value="required"/>
        <description value="How the Quantity should be understood and represented"/>
        <valueSetReference>
          <reference value="http://hl7.org/fhir/vs/quantity-comparator"/>
        </valueSetReference>
      </binding>
      <mapping>
        <identity value="v2"/>
        <map value="SN.1  / CQ.1"/>
      </mapping>
      <mapping>
        <identity value="rim"/>
        <map value="IVL properties"/>
      </mapping>
    </element>
    <element>
      <path value="Quantity.units"/>
      <short value="Unit representation"/>
      <definition value="A human-readable form of the units."/>
      <requirements value="There are many representations for units and in many contexts, particular representations
       are fixed and required. I.e. mcg for micrograms."/>
      <min value="0"/>
      <max value="1"/>
      <type>
        <code value="string"/>
      </type>
      <mapping>
        <identity value="v2"/>
        <map value="(see OBX.6 etc) / CQ.2"/>
      </mapping>
      <mapping>
        <identity value="rim"/>
        <map value="PQ.unit"/>
      </mapping>
    </element>
    <element>
      <path value="Quantity.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"/>
      <type>
        <code value="uri"/>
      </type>
      <condition value="qty-3"/>
      <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>
      <path value="Quantity.code"/>
      <short value="Coded form of the unit"/>
      <definition value="A computer processable form of the units in some unit representation system."/>
      <comments 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 units 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"/>
      <type>
        <code value="code"/>
      </type>
      <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>
      <path value="Quantity"/>
      <name value="Count"/>
      <short value="A count of a discrete element (no unit)"/>
      <definition value="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."/>
      <min value="1"/>
      <max value="1"/>
      <type>
        <code value="Quantity"/>
      </type>
      <constraint>
        <key value="cnt-1"/>
        <severity value="error"/>
        <human value="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."/>
        <xpath value="(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, '.'))"/>
      </constraint>
      <isModifier value="false"/>
    </element>
  </differential>
</StructureDefinition>