<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="observation-precondition" />
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="oo" />
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="1" />
  </extension>
  <url value="http://hl7.org/fhir/StructureDefinition/observation-precondition" />
  <version value="4.6.0" />
  <name value="precondition" />
  <title value="Precondition" />
  <status value="draft" />
  <date value="2015-03-02" />
  <publisher value="Health Level Seven, Inc. - OO WG" />
  <contact>
    <telecom>
      <system value="url" />
      <value value="http://hl7.org/special/committees/orders" />
    </telecom>
  </contact>
  <description value="Other preceding or concurrent observations that must be known to correctly interpret the the observation.  For example an fiO2 measure taken alongside of a SpO2 measurement.  See the [Observation notes](observation.html#notes) section for additional guidance." />
  <fhirVersion value="4.6.0" />
  <mapping>
    <identity value="rim" />
    <uri value="http://hl7.org/v3" />
    <name value="RIM Mapping" />
  </mapping>
  <kind value="complex-type" />
  <abstract value="false" />
  <context>
    <type value="element" />
    <expression value="Observation" />
  </context>
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <differential>
    <element id="Extension">
      <path value="Extension" />
      <short value="Other Observations needed to aid in  the interpretation of the source observation." />
      <definition value="Other preceding or concurrent observations that must be known to correctly interpret the the observation.  For example an fiO2 measure taken alongside of a SpO2 measurement.  See the [Observation notes](observation.html#notes) section for additional guidance." />
      <min value="0" />
      <max value="*" />
    </element>
    <element id="Extension.extension">
      <path value="Extension.extension" />
      <max value="0" />
    </element>
    <element id="Extension.url">
      <path value="Extension.url" />
      <fixedUri value="http://hl7.org/fhir/StructureDefinition/observation-precondition" />
    </element>
    <element id="Extension.value[x]">
      <path value="Extension.value[x]" />
      <min value="1" />
      <type>
        <code value="Reference" />
        <targetProfile value="http://hl7.org/fhir/StructureDefinition/Observation" />
      </type>
    </element>
  </differential>
</StructureDefinition>