<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="http://www.agfa.com/ei/fhir/StructureDefinition/ei_requestedprocedure_extension" />
  <name value="Requested_Procedure_Extension" />
  <status value="draft" />
  <fhirVersion value="4.0.0" />
  <mapping>
    <identity value="agfa-ei-model" />
    <name value="Enterprise Imaging DB model" />
  </mapping>
  <kind value="complex-type" />
  <abstract value="false" />
  <context>
    <type value="element" />
    <expression value="ServiceRequest" />
  </context>
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <snapshot />
  <differential>
    <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:Type">
      <path value="Extension.extension" />
      <sliceName value="Type" />
      <min value="1" />
      <max value="1" />
      <binding>
        <strength value="required" />
        <valueSet value="http://www.agfa.com/ei/fhir/ValueSet/ei-vs-servicerequest-type" />
      </binding>
    </element>
    <element id="Extension.extension:Type.url">
      <path value="Extension.extension.url" />
      <fixedUri value="Type" />
    </element>
    <element id="Extension.extension:Type.value[x]">
      <path value="Extension.extension.value[x]" />
      <code>
        <system value="http://www.agfa.com/ei/fhir/ValueSet/ei-vs-servicerequest-type" />
        <code value="REQUESTED_PROCEDURE" />
        <display value="REQUESTED_PROCEDURE" />
      </code>
      <short value="SERVICE_REQUEST | REQUESTED_PROCEDURE | SCHEDULED_PROCEDURE_STEP" />
      <min value="1" />
      <type>
        <code value="code" />
        <profile value="http://www.agfa.com/ei/fhir/ValueSet/ei-vs-servicerequest-type" />
      </type>
      <binding>
        <strength value="required" />
        <valueSet value="http://www.agfa.com/ei/fhir/ValueSet/ei-vs-servicerequest-type" />
      </binding>
    </element>
    <element id="Extension.extension:Laterality">
      <path value="Extension.extension" />
      <sliceName value="Laterality" />
      <max value="1" />
      <mapping>
        <identity value="agfa-ei-model" />
        <map value="TODO: should most probably be a code system - value set -&gt; as indicated by Peter K  -&gt; maybe a genereal EI code system and then separate value sets with limited sets of codes to support? I know I've not don't this properly... it's just a 'placeholder' to address after reviewing the profiles ..." />
      </mapping>
    </element>
    <element id="Extension.extension:Laterality.url">
      <path value="Extension.extension.url" />
      <fixedUri value="Laterality" />
    </element>
    <element id="Extension.extension:Laterality.value[x]">
      <path value="Extension.extension.value[x]" />
      <code>
        <code value="L" />
        <display value="Left" />
      </code>
      <code>
        <code value="R" />
        <display value="Right" />
      </code>
      <code>
        <code value="B" />
        <display value="Both" />
      </code>
      <code>
        <code value="U" />
        <display value="Unilateral" />
      </code>
      <code>
        <code value="empty" />
        <display value="Not defined" />
      </code>
      <type>
        <code value="code" />
      </type>
    </element>
    <element id="Extension.url">
      <path value="Extension.url" />
      <fixedUri value="http://www.agfa.com/ei/fhir/StructureDefinition/ei_requestedprocedure_extension" />
    </element>
    <element id="Extension.value[x]">
      <path value="Extension.value[x]" />
      <max value="0" />
    </element>
  </differential>
</StructureDefinition>