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  <url value="https://fhir.centraxx.de/StructureDefinition/SystemTherapyReference" />
  <version value="2026.2.0" />
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  <status value="active" />
  <publisher value="IQVIA" />
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  <abstract value="false" />
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  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Reference" />
  <derivation value="constraint" />
  <differential>
    <element id="Reference.reference">
      <path value="Reference.reference" />
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    <element id="Reference.identifier">
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      <mustSupport value="true" />
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      <max value="1" />
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      <mustSupport value="true" />
    </element>
    <element id="Reference.identifier.value">
      <path value="Reference.identifier.value" />
      <min value="1" />
      <max value="1" />
      <mustSupport value="true" />
    </element>
  </differential>
</StructureDefinition>