<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="2ea5d124-0227-4f0e-87a9-79a57b342996" />
  <meta>
    <lastUpdated value="2020-02-21T07:54:01.533+00:00" />
  </meta>
  <url value="http://example.org/fhir/StructureDefinition/CTAExtension" />
  <name value="CTAExtension" />
  <status value="draft" />
  <date value="2020-02-21T07:54:40.4276044+00:00" />
  <fhirVersion value="4.0.0" />
  <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" />
      <min value="1" />
      <max value="1" />
    </element>
    <element id="Extension.extension">
      <path value="Extension.extension" />
      <slicing>
        <discriminator>
          <type value="value" />
          <path value="url" />
        </discriminator>
        <rules value="open" />
      </slicing>
    </element>
    <element id="Extension.extension:Blood_vessel_density">
      <path value="Extension.extension" />
      <sliceName value="Blood_vessel_density" />
      <min value="1" />
      <max value="1" />
    </element>
    <element id="Extension.extension:Blood_vessel_density.url">
      <path value="Extension.extension.url" />
      <fixedUri value="Blood_vessel_density" />
    </element>
    <element id="Extension.extension:Blood_vessel_density.value[x]">
      <path value="Extension.extension.value[x]" />
      <min value="1" />
      <type>
        <code value="Quantity" />
        <profile value="http://hl7.org/fhir/StructureDefinition/SimpleQuantity" />
      </type>
    </element>
    <element id="Extension.extension:Blood_vessel_density.value[x].value">
      <path value="Extension.extension.value[x].value" />
      <minValueDecimal value="0" />
      <maxValueDecimal value="100" />
    </element>
    <element id="Extension.extension:Blood_vessel_density.value[x].unit">
      <path value="Extension.extension.value[x].unit" />
      <fixedString value="%" />
    </element>
    <element id="Extension.extension:Blood_vessel_density.value[x].system">
      <path value="Extension.extension.value[x].system" />
      <fixedUri value="http://unitsofmeasure.org" />
    </element>
    <element id="Extension.extension:Blood_vessel_density.value[x].code">
      <path value="Extension.extension.value[x].code" />
      <fixedCode value="%" />
    </element>
    <element id="Extension.extension:Eval_date">
      <path value="Extension.extension" />
      <sliceName value="Eval_date" />
      <min value="1" />
      <max value="1" />
    </element>
    <element id="Extension.extension:Eval_date.url">
      <path value="Extension.extension.url" />
      <fixedUri value="Eval_date" />
    </element>
    <element id="Extension.extension:Eval_date.value[x]">
      <path value="Extension.extension.value[x]" />
      <min value="1" />
      <type>
        <code value="dateTime" />
      </type>
    </element>
    <element id="Extension.url">
      <path value="Extension.url" />
      <fixedUri value="http://example.org/fhir/StructureDefinition/CTAExtension" />
    </element>
    <element id="Extension.value[x]">
      <path value="Extension.value[x]" />
      <max value="0" />
    </element>
  </differential>
</StructureDefinition>