<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="iso21090-uncertainty" />
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="fhir" />
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="1" />
  </extension>
  <url value="http://hl7.org/fhir/StructureDefinition/iso21090-uncertainty" />
  <name value="uncertainty" />
  <status value="draft" />
  <date value="2012-06-24" />
  <publisher value="Health Level Seven International (Modeling and Methodology)" />
  <contact>
    <telecom>
      <system value="url" />
      <value value="http://www.hl7.org/Special/committees/mnm" />
    </telecom>
  </contact>
  <description value="The primary measure of variance/uncertainty of the value (the square root of the sum of the squares of the differences between all data points and the mean)." />
  <fhirVersion value="3.0.1" />
  <mapping>
    <identity value="rim" />
    <uri value="http://hl7.org/v3" />
    <name value="RIM Mapping" />
  </mapping>
  <kind value="complex-type" />
  <abstract value="false" />
  <contextType value="datatype" />
  <context value="Quantity" />
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <differential>
    <element id="Extension">
      <path value="Extension" />
      <short value="Standard Deviation (same units as the quantity)" />
      <definition value="The primary measure of variance/uncertainty of the value (the square root of the sum of the squares of the differences between all data points and the mean)." />
      <comment value="standardDeviation has the same units as the quantity. It is used to normalize the data for computing the distribution function. Applications that cannot deal with probability distributions can still get an idea about the confidence level by looking at standardDeviation." />
      <min value="0" />
      <max value="1" />
      <mapping>
        <identity value="rim" />
        <map value="PPD.standardDeviation" />
      </mapping>
    </element>
    <element id="Extension.extension">
      <path value="Extension.extension" />
      <max value="0" />
    </element>
    <element id="Extension.url">
      <path value="Extension.url" />
      <type>
        <code value="uri" />
      </type>
      <fixedUri value="http://hl7.org/fhir/StructureDefinition/iso21090-uncertainty" />
    </element>
    <element id="Extension.valueDecimal">
      <path value="Extension.valueDecimal" />
      <type>
        <code value="decimal" />
      </type>
    </element>
  </differential>
</StructureDefinition>