<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="ext-FormalResearch" />
  <url value="https://vitalhub.com/fhir/StructureDefinition/ext-FormalResearch" />
  <name value="FormalResearchExtension" />
  <title value="Formal Research Extension" />
  <status value="active" />
  <publisher value="VitalHub" />
  <description value="Extension to capture formal research details including type, period, REB, and linked document GUID." />
  <fhirVersion value="4.0.1" />
  <kind value="complex-type" />
  <abstract value="false" />
  <context>
    <type value="element" />
    <expression value="Consent" />
  </context>
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <differential>
    <element id="Extension">
      <path value="Extension" />
      <short value="Formal Research" />
      <definition value="Complex extension capturing research type, period, REB, and linked document GUID." />
    </element>
    <element id="Extension.url">
      <path value="Extension.url" />
      <min value="1" />
      <max value="1" />
      <fixedUri value="https://vitalhub.com/fhir/StructureDefinition/ext-FormalResearch" />
    </element>
    <element id="Extension.valueBoolean">
      <path value="Extension.valueBoolean" />
      <short value="Research" />
      <definition value="True if opting in to research" />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="boolean" />
      </type>
    </element>
    <element id="Extension.extension">
      <path value="Extension.extension" />
      <slicing>
        <discriminator>
          <type value="value" />
          <path value="url" />
        </discriminator>
        <ordered value="false" />
        <rules value="open" />
      </slicing>
      <min value="0" />
      <max value="*" />
    </element>
    <element id="Extension.extension:type">
      <path value="Extension.extension" />
      <sliceName value="type" />
      <short value="Research type" />
      <definition value="Type of formal research." />
      <min value="0" />
      <max value="1" />
    </element>
    <element id="Extension.extension:type.url">
      <path value="Extension.extension.url" />
      <min value="1" />
      <max value="1" />
      <fixedUri value="https://vitalhub.com/fhir/StructureDefinition/ext-FormalResearch#type" />
    </element>
    <element id="Extension.extension:type.valueCodeableConcept">
      <path value="Extension.extension.valueCodeableConcept" />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="CodeableConcept" />
      </type>
      <binding>
        <strength value="required" />
        <valueSet value="https://vitalhub.com/fhir/ValueSet/vs-ResearchType" />
      </binding>
    </element>
    <element id="Extension.extension:start">
      <path value="Extension.extension" />
      <sliceName value="start" />
      <short value="Research start date/time" />
      <definition value="Start date/time of the research period." />
      <min value="0" />
      <max value="1" />
    </element>
    <element id="Extension.extension:start.url">
      <path value="Extension.extension.url" />
      <min value="1" />
      <max value="1" />
      <fixedUri value="https://vitalhub.com/fhir/StructureDefinition/ext-FormalResearch#start" />
    </element>
    <element id="Extension.extension:start.valueDateTime">
      <path value="Extension.extension.valueDateTime" />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="dateTime" />
      </type>
    </element>
    <element id="Extension.extension:end">
      <path value="Extension.extension" />
      <sliceName value="end" />
      <short value="Research end date/time" />
      <definition value="End date/time of the research period." />
      <min value="0" />
      <max value="1" />
    </element>
    <element id="Extension.extension:end.url">
      <path value="Extension.extension.url" />
      <min value="1" />
      <max value="1" />
      <fixedUri value="https://vitalhub.com/fhir/StructureDefinition/ext-FormalResearch#end" />
    </element>
    <element id="Extension.extension:end.valueDateTime">
      <path value="Extension.extension.valueDateTime" />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="dateTime" />
      </type>
    </element>
    <element id="Extension.extension:REB">
      <path value="Extension.extension" />
      <sliceName value="REB" />
      <short value="Research Ethics Board" />
      <definition value="Research Ethics Board associated with the formal research." />
      <min value="0" />
      <max value="1" />
    </element>
    <element id="Extension.extension:REB.url">
      <path value="Extension.extension.url" />
      <min value="1" />
      <max value="1" />
      <fixedUri value="https://vitalhub.com/fhir/StructureDefinition/ext-FormalResearch#REB" />
    </element>
    <element id="Extension.extension:REB.valueCodeableConcept">
      <path value="Extension.extension.valueCodeableConcept" />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="CodeableConcept" />
      </type>
      <binding>
        <strength value="required" />
        <valueSet value="https://vitalhub.com/fhir/ValueSet/vs-ResearchREB" />
      </binding>
    </element>
    <element id="Extension.extension:linkedDocumentGUID">
      <path value="Extension.extension" />
      <sliceName value="linkedDocumentGUID" />
      <short value="Linked document GUID" />
      <definition value="GUID linking this research record to its supporting document (from ext-Document)." />
      <min value="0" />
      <max value="1" />
    </element>
    <element id="Extension.extension:linkedDocumentGUID.url">
      <path value="Extension.extension.url" />
      <min value="1" />
      <max value="1" />
      <fixedUri value="https://vitalhub.com/fhir/StructureDefinition/ext-FormalResearch#linkedDocumentGUID" />
    </element>
    <element id="Extension.extension:linkedDocumentGUID.valueUri">
      <path value="Extension.extension.valueUri" />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="uri" />
      </type>
    </element>
  </differential>
</StructureDefinition>