<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://fhir.synapxe.sg/StructureDefinition/profile-fileattachment" />
  <name value="FileAttachment" />
  <status value="active" />
  <fhirVersion value="5.0.0" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="DocumentReference" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/DocumentReference" />
  <derivation value="constraint" />
  <differential>
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      <path value="DocumentReference.identifier" />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="Identifier" />
        <profile value="https://fhir.synapxe.sg/StructureDefinition/profile-identifier" />
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      <path value="DocumentReference.identifier.system" />
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        <code value="CodeableConcept" />
        <profile value="https://fhir.synapxe.sg/StructureDefinition/profile-codeableconcept" />
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      <binding>
        <strength value="required" />
        <valueSet value="https://fhir.synapxe.sg/ValueSet/attachment-category" />
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  </differential>
</StructureDefinition>