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<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="openEHR-exposureDuration" />
  <url value="http://hl7.org/fhir/StructureDefinition/openEHR-exposureDuration" />
  <name value="Amount of time individual was exposed to Substance" />
  <status value="draft" />
  <experimental value="false" />
  <publisher value="Health Level Seven, Inc / openEHR project" />
  <contact>
    <telecom>
      <system value="other" />
      <value value="http://hl7.org" />
      <rank value="1" />
    </telecom>
  </contact>
  <description value="The amount of time the individual was exposed to the Substance." />
  <fhirVersion value="1.6.0" />
  <kind value="datatype" />
  <abstract value="false" />
  <contextType value="resource" />
  <context value="AllergyIntolerance.reaction" />
  <baseType value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <snapshot>
    <element>
      <path value="Extension" />
      <short value="Amount of time individual was exposed to Substance" />
      <definition value="The amount of time the individual was exposed to the Substance." />
      <min value="0" />
      <max value="1" />
      <base>
        <path value="Extension" />
        <min value="0" />
        <max value="*" />
      </base>
      <maxLength value="0" />
      <mustSupport value="false" />
      <isModifier value="false" />
      <isSummary value="false" />
    </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/openEHR-exposureDuration" />
      <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.valueQuantity" />
      <name value="Duration" />
      <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)." />
      <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." />
      <min value="1" />
      <max value="1" />
      <base>
        <path value="Extension.value[x]" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="Quantity" />
        <profile value="http://hl7.org/fhir/StructureDefinition/Duration" />
      </type>
      <maxLength value="0" />
      <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)" />
      </constraint>
      <constraint>
        <key value="drt-1" />
        <severity value="error" />
        <human value="There SHALL be a code if there is a value and it SHALL be an expression of time.  If system is present, it SHALL be UCUM." />
        <expression value="(code.exists() or value.empty()) and (system.empty() or system = %ucum)" />
        <xpath value="(f:code or not(f:value)) and (not(exists(f:system)) or f:system/@value='http://unitsofmeasure.org')" />
      </constraint>
      <mustSupport value="false" />
      <isModifier value="false" />
      <isSummary 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>
  </snapshot>
  <differential>
    <element>
      <path value="Extension" />
      <short value="Amount of time individual was exposed to Substance" />
      <definition value="The amount of time the individual was exposed to the Substance." />
      <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" />
      <mustSupport value="false" />
      <isModifier value="false" />
      <isSummary value="false" />
    </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/openEHR-exposureDuration" />
      <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="Quantity" />
        <profile value="http://hl7.org/fhir/StructureDefinition/Duration" />
      </type>
      <maxLength value="0" />
      <mustSupport value="false" />
      <isModifier value="false" />
      <isSummary value="false" />
    </element>
  </differential>
</StructureDefinition>

name : Amount of time individual was exposed to Substance

{

}

<name value="Amount of time individual was exposed to Substance" />