<?xml version="1.0" encoding="UTF-8"?>

<PlanDefinition xmlns="http://hl7.org/fhir">
  <id value="IMMZD18SVaricella2Doses"/>
  <meta>
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  <text>
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<div>
    <table class="grid dict">
        
        <tr>
            <th scope="row"><b>Id: </b></th>
            <td style="padding-left: 4px;">IMMZD18SVaricella2Doses</td>
        </tr>
        

        
        <tr>
            <th scope="row"><b>Url: </b></th>
            <td style="padding-left: 4px;"><a href="PlanDefinition-IMMZD18SVaricella2Doses.html">IMMZ.D18.S.Varicella.2-dose schedule</a></td>
        </tr>
        

        
        <tr>
            <th scope="row"><b>Version: </b></th>
            <td style="padding-left: 4px;">1.0.0</td>
        </tr>
        

        

        
        <tr>
            <th scope="row"><b>Title: </b></th>
            <td style="padding-left: 4px;">IMMZ.D18.S.Varicella.2-dose schedule</td>
        </tr>
        

        

        
        <tr>
            <th scope="row"><b>Status: </b></th>
            <td style="padding-left: 4px;">draft</td>
        </tr>
        

        

        
        <tr>
            <th scope="row"><b>Type: </b></th>
            <td style="padding-left: 4px;">
                
                    
                        
                        <p style="margin-bottom: 5px;">
                            <b>system: </b> <span><a href="http://terminology.hl7.org/7.1.0/CodeSystem-plan-definition-type.html">http://terminology.hl7.org/CodeSystem/plan-definition-type</a></span>
                        </p>
                        
                        
                        <p style="margin-bottom: 5px;">
                            <b>code: </b> <span>eca-rule</span>
                        </p>
                        
                        
                    
                
                
            </td>
        </tr>
        

        

        
        <tr>
            <th scope="row"><b>Date: </b></th>
            <td style="padding-left: 4px;">2026-03-31 13:54:17+0000</td>
        </tr>
        

        
        <tr>
            <th scope="row"><b>Publisher: </b></th>
            <td style="padding-left: 4px;">WHO</td>
        </tr>
        

        
        <tr>
            <th scope="row"><b>Description: </b></th>
            <td style="padding-left: 4px;"><div><p>IMMZ.D18.S.Varicella.2-dose schedule
2-dose schedule</p>
</div></td>
        </tr>
        

        
        <tr>
            <th scope="row"><b>Knowledge Capability: </b></th>
            <td style="padding-left: 4px;">
                
                computable 
            </td>
        </tr>
        

        

        

        

        

        

        

        

        

        

        
        <tr>
            <th scope="row"><b>Related Artifacts: </b></th>
            <td style="padding-left: 4px;">
                
                
                <p><b>References</b></p>
                <ul>
                    
                    <li><div><p>WHO recommendations for routine immunization - summary tables (January 2025)</p>
</div><br/><a href="null"/></li>
                    
                </ul>
                
                
                
                
                
                
            </td>
        </tr>
        

        
        <tr>
            <th scope="row"><b>Libraries: </b></th>
            <td style="padding-left: 4px;">
                <table class="grid-dict">
                    
                    <tr>
                        <td><a href="Library-IMMZD18SVaricella2DosesLogic.html">IMMZD18SVaricella2DosesLogic</a></td>
                    </tr>
                    
                </table>
            </td>
        </tr>
        

        
        <tr>
            <th scope="row"><b>Actions: </b></th>
            <td style="padding-left: 4px;">
                <table class="grid-dict">
                    
                    <tr>
                        <td>
                            
                            <b> Varicella dose 1:</b> Provision of the varicella dose 1
Trigger event: Child's birth
Trigger pseudo: 
Trigger date: &quot;Date of birth&quot;
Create condition: Depending on the goal of the vaccination programme, 1–2 doses should be given with the first dose administered at 12–18 months of age.
                            
                            <br/>
                            
                            
                            <b>If:</b>
                            
                            <i>Applicability:</i>
                            
                            Varicella dose 1
                            
                            <i>(Varicella dose 1)</i>
                            <br/>
                            
                            
                            
                            
                            <b>Then:</b> <i>Definition:</i> <a href="ActivityDefinition-IMMZD2DTCR.html">IMMZ.D2.DT.CR</a><br/>
                            
                            <i>Dynamic Values:</i><br/>
                            
                            status: <i>('active')</i>
                            <br/>
                            
                            payload.contentString: <i>(Varicella dose 1 Create)</i>
                            <br/>
                            
                            category.coding: <i>(Code { system: 'http://terminology.hl7.org/CodeSystem/communication-category', code: 'alert' })</i>
                            <br/>
                            
                            priority: <i>(Code { system: 'http://hl7.org/fhir/request-priority', code: 'routine' })</i>
                            <br/>
                            
                            
                            
                            
                        </td>
                    </tr>
                    
                    <tr>
                        <td>
                            
                            <b> Varicella dose 2:</b> Provision of the varicella dose 2
Trigger event: First varicella dose from the primary series was administered
Trigger pseudo: Count of vaccines administered (where &quot;Vaccine type&quot; = &quot;Varicella-containing vaccines&quot; and &quot;Type of dose&quot; = &quot;Primary series&quot;) =1
Trigger date: &quot;Date and time of vaccination&quot; (where &quot;Vaccine type&quot; = &quot;Varicella-containing vaccines&quot;)
Create condition: The minimum interval between doses should be as recommended by the manufacturer, ranging from 4 weeks to 3 months.
                            
                            <br/>
                            
                            
                            <b>If:</b>
                            
                            <i>Applicability:</i>
                            
                            Varicella dose 2
                            
                            <i>(Varicella dose 2)</i>
                            <br/>
                            
                            
                            
                            
                            <b>Then:</b> <i>Definition:</i> <a href="ActivityDefinition-IMMZD2DTCR.html">IMMZ.D2.DT.CR</a><br/>
                            
                            <i>Dynamic Values:</i><br/>
                            
                            status: <i>('active')</i>
                            <br/>
                            
                            payload.contentString: <i>(Varicella dose 2 Create)</i>
                            <br/>
                            
                            category.coding: <i>(Code { system: 'http://terminology.hl7.org/CodeSystem/communication-category', code: 'alert' })</i>
                            <br/>
                            
                            priority: <i>(Code { system: 'http://hl7.org/fhir/request-priority', code: 'routine' })</i>
                            <br/>
                            
                            
                            
                            
                        </td>
                    </tr>
                    
                </table>
            </td>
        </tr>
        
    </table>
</div>
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          <valueString value="Doses Administered to Patient"/>
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          <valueString value="/*&#xA;@input: One varicella primary series dose was administered&#xA;@pseudocode: Count of vaccines administered (where &quot;Vaccine type&quot; = &quot;Varicella-containing vaccines&quot; and &quot;Type of dose&quot; = &quot;Primary series&quot;) = 1&#xA;@code: One varicella primary series dose was administered-129&#xA;@decision: IMMZ.D2.DT.Varicella.1 dose: Countries where varicella is an important public health burden could consider introducing varicella vaccination in the routine childhood immunization programme. However, resources should be sufficient to ensure reaching and sustaining vaccine coverage ≥ 80%. Decision-making on childhood varicella vaccination should also include consideration of the possible impact on herpes zoster.&#xA;The number of doses recommended is dependent on the goal of the vaccination programme. One dose is sufficient to reduce mortality and severe morbidity from varicella but not to prevent limited virus circulation and outbreaks. Two doses have higher effectiveness and should therefore be recommended in countries where the programmatic goal is, in addition to decreasing mortality and severe morbidity, to further reduce the number of cases and outbreaks.&#xA;@decision: IMMZ.D2.DT.Varicella.2 doses: Countries where varicella is an important public health burden could consider introducing varicella vaccination in the routine childhood immunization programme. However, resources should be sufficient to ensure reaching and sustaining vaccine coverage ≥ 80%. Decision-making on childhood varicella vaccination should also include consideration of the possible impact on herpes zoster.&#xA;The number of doses recommended is dependent on the goal of the vaccination programme. One dose is sufficient to reduce mortality and severe morbidity from varicella but not to prevent limited virus circulation and outbreaks. Two doses have higher effectiveness and should therefore be recommended in countries where the programmatic goal is, in addition to decreasing mortality and severe morbidity, to further reduce the number of cases and outbreaks.&#xA;*/&#xA;define &quot;One varicella primary series dose was administered&quot;:&#xA;  &quot;Number of Varicella Primary Series Doses Administered&quot; = 1"/>
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          <valueString value="First varicella dose from the primary series was administered"/>
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          <valueString value="/*&#xA;@complete: First varicella dose from the primary series was administered&#xA;@pseudocode: Count of vaccines administered (where &quot;Vaccine type&quot; = &quot;Varicella-containing vaccines&quot; and &quot;Type of dose&quot; = &quot;Primary series&quot;) =1&#xA;*/&#xA;define &quot;First varicella dose from the primary series was administered&quot;:&#xA;  Encounter.&quot;One varicella primary series dose was administered&quot;"/>
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          <valueInteger value="6"/>
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          <valueString value="IMMZD2DTVaricellaEncounterElements"/>
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          <valueString value="Two varicella primary series doses were administered"/>
        </extension>
        <extension url="statement">
          <valueString value="/*&#xA;@input: Two varicella primary series doses were administered&#xA;@pseudocode: Count of vaccines administered (where &quot;Vaccine type&quot; = &quot;Varicella-containing vaccines&quot; and &quot;Type of dose&quot; = &quot;Primary series&quot;) = 2&#xA;@code: Two varicella primary series doses were administered-129&#xA;@decision: IMMZ.D2.DT.Varicella.2 doses: Countries where varicella is an important public health burden could consider introducing varicella vaccination in the routine childhood immunization programme. However, resources should be sufficient to ensure reaching and sustaining vaccine coverage ≥ 80%. Decision-making on childhood varicella vaccination should also include consideration of the possible impact on herpes zoster.&#xA;The number of doses recommended is dependent on the goal of the vaccination programme. One dose is sufficient to reduce mortality and severe morbidity from varicella but not to prevent limited virus circulation and outbreaks. Two doses have higher effectiveness and should therefore be recommended in countries where the programmatic goal is, in addition to decreasing mortality and severe morbidity, to further reduce the number of cases and outbreaks.&#xA;*/&#xA;define &quot;Two varicella primary series doses were administered&quot;:&#xA;  &quot;Number of Varicella Primary Series Doses Administered&quot; = 2"/>
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          <valueInteger value="7"/>
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        <extension url="libraryName">
          <valueString value="IMMZD18SVaricella2DosesLogic"/>
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        <extension url="name">
          <valueString value="Second varicella dose from the primary series was administered. The primary series has been completed"/>
        </extension>
        <extension url="statement">
          <valueString value="/*&#xA;@complete: Second varicella dose from the primary series was administered. The primary series has been completed&#xA;@pseudocode: &quot;Completed the primary vaccination series&quot; = TRUE (where &quot;Vaccine type&quot; = &quot;Varicella-containing vaccines&quot;)&quot;&#xA;*/&#xA;define &quot;Second varicella dose from the primary series was administered. The primary series has been completed&quot;:&#xA;  Encounter.&quot;Two varicella primary series doses were administered&quot;"/>
        </extension>
        <extension url="displaySequence">
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        <extension url="name">
          <valueString value="Varicella dose 2"/>
        </extension>
        <extension url="statement">
          <valueString value="/*&#xA;@output: Varicella dose 2&#xA;@description: Provision of the varicella dose 2&#xA;@trigger: First varicella dose from the primary series was administered&#xA;@pseudo: Count of vaccines administered (where &quot;Vaccine type&quot; = &quot;Varicella-containing vaccines&quot; and &quot;Type of dose&quot; = &quot;Primary series&quot;) =1&#xA;@triggerDate: &quot;Date and time of vaccination&quot; (where &quot;Vaccine type&quot; = &quot;Varicella-containing vaccines&quot;)&#xA;*/&#xA;define &quot;Varicella dose 2&quot;:&#xA;  &quot;First varicella dose from the primary series was administered&quot;&#xA;  and not &quot;Second varicella dose from the primary series was administered. The primary series has been completed&quot;"/>
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        <extension url="libraryName">
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          <valueString value="Date of Latest Varicella Dose"/>
        </extension>
        <extension url="statement">
          <valueString value="/*&#xA;@internal: Date of Latest Varicella Dose&#xA;*/&#xA;define &quot;Date of Latest Varicella Dose&quot;:&#xA;  date from start of &quot;Varicella Doses Administered to Patient&quot;.mostRecent().occurrence.toInterval()"/>
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        <extension url="libraryName">
          <valueString value="IMMZD18SVaricella2DosesLogic"/>
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          <valueString value="Varicella dose 2 Due Date"/>
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          <valueString value="/*&#xA;@dynamicValue: Varicella dose 2 Due Date&#xA;@pseudocode: &quot;Date and time of vaccination&quot; (where &quot;Vaccine type&quot; = &quot;Varicella-containing vaccines&quot;) + 4 weeks&#xA;*/&#xA;define &quot;Varicella dose 2 Due Date&quot;:&#xA;  if &quot;Varicella dose 2&quot; then Encounter.&quot;Date of Latest Varicella Dose&quot; + 4 weeks&#xA;  else null"/>
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          <valueString value="No varicella primary series dose was administered"/>
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          <valueString value="/*&#xA;@input: No varicella primary series dose was administered&#xA;@pseudocode: Count of vaccines administered (where &quot;Vaccine type&quot; = &quot;Varicella-containing vaccines&quot; and &quot;Type of dose&quot; = &quot;Primary series&quot;) = 0&#xA;@code: No varicella primary series dose was administered-129&#xA;@decision: IMMZ.D2.DT.Varicella.1 dose: Countries where varicella is an important public health burden could consider introducing varicella vaccination in the routine childhood immunization programme. However, resources should be sufficient to ensure reaching and sustaining vaccine coverage ≥ 80%. Decision-making on childhood varicella vaccination should also include consideration of the possible impact on herpes zoster.&#xA;The number of doses recommended is dependent on the goal of the vaccination programme. One dose is sufficient to reduce mortality and severe morbidity from varicella but not to prevent limited virus circulation and outbreaks. Two doses have higher effectiveness and should therefore be recommended in countries where the programmatic goal is, in addition to decreasing mortality and severe morbidity, to further reduce the number of cases and outbreaks.&#xA;*/&#xA;define &quot;No varicella primary series dose was administered&quot;:&#xA;  &quot;Number of Varicella Primary Series Doses Administered&quot; = 0"/>
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          <valueInteger value="13"/>
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        <extension url="libraryName">
          <valueString value="IMMZD2DTVaricellaEncounterElements"/>
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        <extension url="name">
          <valueString value="No varicella primary series doses were administered"/>
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        <extension url="statement">
          <valueString value="/*&#xA;@input: No varicella primary series doses were administered&#xA;@pseudocode: Count of vaccines administered (where &quot;Vaccine type&quot; = &quot;Varicella-containing vaccines&quot; and &quot;Type of dose&quot; = &quot;Primary series&quot;) = 0&#xA;@code: No varicella primary series doses were administered-129&#xA;@decision: IMMZ.D2.DT.Varicella.2 doses: Countries where varicella is an important public health burden could consider introducing varicella vaccination in the routine childhood immunization programme. However, resources should be sufficient to ensure reaching and sustaining vaccine coverage ≥ 80%. Decision-making on childhood varicella vaccination should also include consideration of the possible impact on herpes zoster.&#xA;The number of doses recommended is dependent on the goal of the vaccination programme. One dose is sufficient to reduce mortality and severe morbidity from varicella but not to prevent limited virus circulation and outbreaks. Two doses have higher effectiveness and should therefore be recommended in countries where the programmatic goal is, in addition to decreasing mortality and severe morbidity, to further reduce the number of cases and outbreaks.&#xA;*/&#xA;define &quot;No varicella primary series doses were administered&quot;:&#xA;  &quot;No varicella primary series dose was administered&quot;"/>
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          <valueString value="IMMZD18SVaricella2DosesLogic"/>
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          <valueString value="/*&#xA;@output: Varicella dose 1&#xA;@description: Provision of the varicella dose 1&#xA;@trigger: Child's birth&#xA;@pseudo: &#xA;@triggerDate: &quot;Date of birth&quot;&#xA;*/&#xA;define &quot;Varicella dose 1&quot;:&#xA;  Encounter.&quot;No varicella primary series doses were administered&quot;&#xA;  and not &quot;First varicella dose from the primary series was administered&quot;"/>
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          <valueString value="IMMZD18SVaricella2DosesLogic"/>
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          <valueString value="Varicella dose 1 Overdue"/>
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          <valueString value="/*&#xA;@dynamicValue: Varicella dose 1 Overdue&#xA;@pseudocode: &quot;Date of birth&quot; + 18 months&#xA;*/&#xA;define &quot;Varicella dose 1 Overdue&quot;:&#xA;  if &quot;Varicella dose 1&quot; then Patient.birthDate + 18 months&#xA;  else null"/>
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        </extension>
        <extension url="statement">
          <valueString value="/*&#xA;@output: Varicella dose 1 Create&#xA;@create: Depending on the goal of the vaccination programme, 1–2 doses should be given with the first dose administered at 12–18 months of age.&#xA;*/&#xA;define &quot;Varicella dose 1 Create&quot;:&#xA;  if &quot;Varicella dose 1&quot;&#xA;  then 'Depending on the goal of the vaccination programme, 1–2 doses should be given with the first dose administered at 12–18 months of age.' + '&#xA;Due Date: ' + ToString(&quot;Varicella dose 1 Due Date&quot;) + '&#xA;Overdue: ' + ToString(&quot;Varicella dose 1 Overdue&quot;)&#xA;  else ''"/>
        </extension>
        <extension url="displaySequence">
          <valueInteger value="18"/>
        </extension>
      </extension>
      <extension url="http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition">
        <extension url="libraryName">
          <valueString value="IMMZCommon"/>
        </extension>
        <extension url="name">
          <valueString value="seriesPrimary"/>
        </extension>
        <extension url="statement">
          <valueString value="/**&#xA; * @description: Gets the doses from the primary series&#xA; */&#xA;define fluent function seriesPrimary(immunizations List&lt;Immunization&gt;):&#xA;  immunizations I where&#xA;    exists( I.protocolApplied pa where pa.series = 'Primary series' )"/>
        </extension>
        <extension url="displaySequence">
          <valueInteger value="19"/>
        </extension>
      </extension>
      <extension url="http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition">
        <extension url="libraryName">
          <valueString value="FHIRHelpers"/>
        </extension>
        <extension url="name">
          <valueString value="ToString"/>
        </extension>
        <extension url="statement">
          <valueString value="define function ToString(value string): value.value"/>
        </extension>
        <extension url="displaySequence">
          <valueInteger value="20"/>
        </extension>
      </extension>
      <extension url="http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition">
        <extension url="libraryName">
          <valueString value="FHIRHelpers"/>
        </extension>
        <extension url="name">
          <valueString value="ToString"/>
        </extension>
        <extension url="statement">
          <valueString value="define function ToString(value ImmunizationStatus): value.value"/>
        </extension>
        <extension url="displaySequence">
          <valueInteger value="21"/>
        </extension>
      </extension>
      <extension url="http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition">
        <extension url="libraryName">
          <valueString value="FHIRHelpers"/>
        </extension>
        <extension url="name">
          <valueString value="ToBoolean"/>
        </extension>
        <extension url="statement">
          <valueString value="define function ToBoolean(value boolean): value.value"/>
        </extension>
        <extension url="displaySequence">
          <valueInteger value="22"/>
        </extension>
      </extension>
      <extension url="http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition">
        <extension url="libraryName">
          <valueString value="WHOCommon"/>
        </extension>
        <extension url="name">
          <valueString value="toInterval"/>
        </extension>
        <extension url="statement">
          <valueString value="/*&#xA;From FHIRCommon 4.1.0:&#xA;*/&#xA;&#xA;/*&#xA;@description: Normalizes a value that is a choice of timing-valued types to an equivalent interval&#xA;@comment: Normalizes a choice type of FHIR.dateTime, FHIR.Period, FHIR.Timing, FHIR.instance, FHIR.string, FHIR.Age, or FHIR.Range types&#xA;to an equivalent interval. This selection of choice types is a superset of the majority of choice types that are used as possible&#xA;representations for timing-valued elements in FHIR, allowing this function to be used across any resource.&#xA;&#xA;The input can be provided as a dateTime, Period, Timing, instant, string, Age, or Range.&#xA;The intent of this function is to provide a clear and concise mechanism to treat single&#xA;elements that have multiple possible representations as intervals so that logic doesn't have to account&#xA;for the variability. More complex calculations (such as medication request period or dispense period&#xA;calculation) need specific guidance and consideration. That guidance may make use of this function, but&#xA;the focus of this function is on single element calculations where the semantics are unambiguous.&#xA;If the input is a dateTime, the result a DateTime Interval beginning and ending on that dateTime.&#xA;If the input is a Period, the result is a DateTime Interval.&#xA;If the input is a Timing, an error is raised indicating a single interval cannot be computed from a Timing.&#xA;If the input is an instant, the result is a DateTime Interval beginning and ending on that instant.&#xA;If the input is a string, an error is raised indicating a single interval cannot be computed from a string.&#xA;If the input is an Age, the result is a DateTime Interval beginning when the patient was the given Age,&#xA;and ending immediately prior to when the patient was the given Age plus one year.&#xA;If the input is a Range, the result is a DateTime Interval beginning when the patient was the Age given&#xA;by the low end of the Range, and ending immediately prior to when the patient was the Age given by the&#xA;high end of the Range plus one year.&#xA;&#xA;NOTE: Due to the&#xA;complexity of determining a single interval from a Timing or String type, this function will throw a run-time exception if it is used&#xA;with a Timing or String.&#xA;*/&#xA;define fluent function toInterval(choice Choice&lt;FHIR.dateTime, FHIR.Period, FHIR.Timing, FHIR.instant, FHIR.string, FHIR.Age, FHIR.Range&gt;):&#xA;  case&#xA;    when choice is FHIR.dateTime then&#xA;      Interval[FHIRHelpers.ToDateTime(choice as FHIR.dateTime), FHIRHelpers.ToDateTime(choice as FHIR.dateTime)]&#xA;    when choice is FHIR.Period then&#xA;      FHIRHelpers.ToInterval(choice as FHIR.Period)&#xA;    when choice is FHIR.instant then&#xA;      Interval[FHIRHelpers.ToDateTime(choice as FHIR.instant), FHIRHelpers.ToDateTime(choice as FHIR.instant)]&#xA;    when choice is FHIR.Age then&#xA;      Interval[FHIRHelpers.ToDate(Patient.birthDate) + FHIRHelpers.ToQuantity(choice as FHIR.Age),&#xA;        FHIRHelpers.ToDate(Patient.birthDate) + FHIRHelpers.ToQuantity(choice as FHIR.Age) + 1 year)&#xA;    when choice is FHIR.Range then&#xA;      Interval[FHIRHelpers.ToDate(Patient.birthDate) + FHIRHelpers.ToQuantity((choice as FHIR.Range).low),&#xA;        FHIRHelpers.ToDate(Patient.birthDate) + FHIRHelpers.ToQuantity((choice as FHIR.Range).high) + 1 year)&#xA;    when choice is FHIR.Timing then&#xA;      Message(null as Interval&lt;DateTime&gt;, true, 'NOT_IMPLEMENTED', 'Error', 'Calculation of an interval from a Timing value is not supported')&#xA;    when choice is FHIR.string then&#xA;      Message(null as Interval&lt;DateTime&gt;, true, 'NOT_IMPLEMENTED', 'Error', 'Calculation of an interval from a String value is not supported')&#xA;    else&#xA;      null as Interval&lt;DateTime&gt;&#xA;  end"/>
        </extension>
        <extension url="displaySequence">
          <valueInteger value="23"/>
        </extension>
      </extension>
      <extension url="http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition">
        <extension url="libraryName">
          <valueString value="FHIRHelpers"/>
        </extension>
        <extension url="name">
          <valueString value="ToDateTime"/>
        </extension>
        <extension url="statement">
          <valueString value="define function ToDateTime(value dateTime): value.value"/>
        </extension>
        <extension url="displaySequence">
          <valueInteger value="24"/>
        </extension>
      </extension>
      <extension url="http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition">
        <extension url="libraryName">
          <valueString value="FHIRHelpers"/>
        </extension>
        <extension url="name">
          <valueString value="ToInterval"/>
        </extension>
        <extension url="statement">
          <valueString value="define function ToInterval(period FHIR.Period):&#xA;    if period is null then&#xA;        null&#xA;    else&#xA;        if period.&quot;start&quot; is null then&#xA;            Interval(period.&quot;start&quot;.value, period.&quot;end&quot;.value]&#xA;        else&#xA;            Interval[period.&quot;start&quot;.value, period.&quot;end&quot;.value]"/>
        </extension>
        <extension url="displaySequence">
          <valueInteger value="25"/>
        </extension>
      </extension>
      <extension url="http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition">
        <extension url="libraryName">
          <valueString value="FHIRHelpers"/>
        </extension>
        <extension url="name">
          <valueString value="ToDateTime"/>
        </extension>
        <extension url="statement">
          <valueString value="define function ToDateTime(value instant): value.value"/>
        </extension>
        <extension url="displaySequence">
          <valueInteger value="26"/>
        </extension>
      </extension>
      <extension url="http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition">
        <extension url="libraryName">
          <valueString value="FHIRHelpers"/>
        </extension>
        <extension url="name">
          <valueString value="ToDate"/>
        </extension>
        <extension url="statement">
          <valueString value="define function ToDate(value date): value.value"/>
        </extension>
        <extension url="displaySequence">
          <valueInteger value="27"/>
        </extension>
      </extension>
      <extension url="http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition">
        <extension url="libraryName">
          <valueString value="FHIRHelpers"/>
        </extension>
        <extension url="name">
          <valueString value="ToQuantity"/>
        </extension>
        <extension url="statement">
          <valueString value="define function ToQuantity(quantity FHIR.Quantity):&#xA;    case&#xA;        when quantity is null then null&#xA;        when quantity.value is null then null&#xA;        when quantity.comparator is not null then&#xA;            Message(null, true, 'FHIRHelpers.ToQuantity.ComparatorQuantityNotSupported', 'Error', 'FHIR Quantity value has a comparator and cannot be converted to a System.Quantity value.')&#xA;        when quantity.system is null or quantity.system.value = 'http://unitsofmeasure.org'&#xA;              or quantity.system.value = 'http://hl7.org/fhirpath/CodeSystem/calendar-units' then&#xA;            System.Quantity { value: quantity.value.value, unit: ToCalendarUnit(Coalesce(quantity.code.value, quantity.unit.value, '1')) }&#xA;        else&#xA;            Message(null, true, 'FHIRHelpers.ToQuantity.InvalidFHIRQuantity', 'Error', 'Invalid FHIR Quantity code: ' &amp; quantity.unit.value &amp; ' (' &amp; quantity.system.value &amp; '|' &amp; quantity.code.value &amp; ')')&#xA;    end"/>
        </extension>
        <extension url="displaySequence">
          <valueInteger value="28"/>
        </extension>
      </extension>
      <extension url="http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition">
        <extension url="libraryName">
          <valueString value="FHIRHelpers"/>
        </extension>
        <extension url="name">
          <valueString value="ToCalendarUnit"/>
        </extension>
        <extension url="statement">
          <valueString value="define function ToCalendarUnit(unit System.String):&#xA;    case unit&#xA;        when 'ms' then 'millisecond'&#xA;        when 's' then 'second'&#xA;        when 'min' then 'minute'&#xA;        when 'h' then 'hour'&#xA;        when 'd' then 'day'&#xA;        when 'wk' then 'week'&#xA;        when 'mo' then 'month'&#xA;        when 'a' then 'year'&#xA;        else unit&#xA;    end"/>
        </extension>
        <extension url="displaySequence">
          <valueInteger value="29"/>
        </extension>
      </extension>
      <extension url="http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition">
        <extension url="libraryName">
          <valueString value="FHIRHelpers"/>
        </extension>
        <extension url="name">
          <valueString value="ToConcept"/>
        </extension>
        <extension url="statement">
          <valueString value="define function ToConcept(concept FHIR.CodeableConcept):&#xA;    if concept is null then&#xA;        null&#xA;    else&#xA;        System.Concept {&#xA;            codes: concept.coding C return ToCode(C),&#xA;            display: concept.text.value&#xA;        }"/>
        </extension>
        <extension url="displaySequence">
          <valueInteger value="30"/>
        </extension>
      </extension>
      <extension url="http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition">
        <extension url="libraryName">
          <valueString value="FHIRHelpers"/>
        </extension>
        <extension url="name">
          <valueString value="ToCode"/>
        </extension>
        <extension url="statement">
          <valueString value="define function ToCode(coding FHIR.Coding):&#xA;    if coding is null then&#xA;        null&#xA;    else&#xA;        System.Code {&#xA;          code: coding.code.value,&#xA;          system: coding.system.value,&#xA;          version: coding.version.value,&#xA;          display: coding.display.value&#xA;        }"/>
        </extension>
        <extension url="displaySequence">
          <valueInteger value="31"/>
        </extension>
      </extension>
      <extension url="http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition">
        <extension url="libraryName">
          <valueString value="WHOCommon"/>
        </extension>
        <extension url="name">
          <valueString value="mostRecent"/>
        </extension>
        <extension url="statement">
          <valueString value="define fluent function mostRecent(immunizations List&lt;Immunization&gt;):&#xA;  Last(&#xA;    immunizations I&#xA;      sort by start of occurrence.toInterval()&#xA;  )"/>
        </extension>
        <extension url="displaySequence">
          <valueInteger value="32"/>
        </extension>
      </extension>
      <name value="EffectiveDataRequirements"/>
      <status value="active"/>
      <type>
        <coding>
          <system value="http://terminology.hl7.org/CodeSystem/library-type"/>
          <code value="module-definition"/>
        </coding>
      </type>
      <relatedArtifact>
        <type value="depends-on"/>
        <display value="FHIR model information"/>
        <resource value="http://fhir.org/guides/cqf/common/Library/FHIR-ModelInfo|4.0.1"/>
      </relatedArtifact>
      <relatedArtifact>
        <type value="depends-on"/>
        <display value="Library Encounter"/>
        <resource value="http://smart.who.int/immunizations/Library/IMMZD2DTVaricellaEncounterElements"/>
      </relatedArtifact>
      <relatedArtifact>
        <type value="depends-on"/>
        <display value="Library Common"/>
        <resource value="http://smart.who.int/immunizations/Library/IMMZCommon"/>
      </relatedArtifact>
      <relatedArtifact>
        <type value="depends-on"/>
        <display value="Library FHIRHelpers"/>
        <resource value="http://fhir.org/guides/cqf/common/Library/FHIRHelpers|4.0.1"/>
      </relatedArtifact>
      <relatedArtifact>
        <type value="depends-on"/>
        <display value="Library Encounter"/>
        <resource value="http://smart.who.int/immunizations/Library/IMMZEncounterElements"/>
      </relatedArtifact>
      <relatedArtifact>
        <type value="depends-on"/>
        <display value="Library Elements"/>
        <resource value="http://smart.who.int/immunizations/Library/IMMZElements"/>
      </relatedArtifact>
      <relatedArtifact>
        <type value="depends-on"/>
        <display value="Library WC"/>
        <resource value="http://smart.who.int/immunizations/Library/WHOCommon"/>
      </relatedArtifact>
      <relatedArtifact>
        <type value="depends-on"/>
        <display value="Library Concepts"/>
        <resource value="http://smart.who.int/immunizations/Library/IMMZConcepts"/>
      </relatedArtifact>
      <relatedArtifact>
        <type value="depends-on"/>
        <display value="Value set Varicella-containing vaccines"/>
        <resource value="http://smart.who.int/immunizations/ValueSet/IMMZ.Z.DE22"/>
      </relatedArtifact>
      <parameter>
        <name value="Today"/>
        <use value="in"/>
        <min value="0"/>
        <max value="1"/>
        <type value="date"/>
      </parameter>
      <parameter>
        <name value="Varicella dose 2 Create"/>
        <use value="out"/>
        <min value="0"/>
        <max value="1"/>
        <type value="string"/>
      </parameter>
      <parameter>
        <name value="Varicella dose 1 Create"/>
        <use value="out"/>
        <min value="0"/>
        <max value="1"/>
        <type value="string"/>
      </parameter>
      <parameter>
        <name value="Varicella dose 1"/>
        <use value="out"/>
        <min value="0"/>
        <max value="1"/>
        <type value="boolean"/>
      </parameter>
      <parameter>
        <name value="Varicella dose 2"/>
        <use value="out"/>
        <min value="0"/>
        <max value="1"/>
        <type value="boolean"/>
      </parameter>
      <dataRequirement>
        <type value="Immunization"/>
        <profile value="http://hl7.org/fhir/StructureDefinition/Immunization"/>
        <mustSupport value="status"/>
        <mustSupport value="isSubpotent"/>
        <mustSupport value="protocolApplied"/>
        <mustSupport value="occurrence"/>
        <codeFilter>
          <path value="status"/>
          <code>
            <code value="completed"/>
          </code>
        </codeFilter>
      </dataRequirement>
      <dataRequirement>
        <type value="Immunization"/>
        <profile value="http://hl7.org/fhir/StructureDefinition/Immunization"/>
        <mustSupport value="occurrence"/>
        <mustSupport value="protocolApplied"/>
      </dataRequirement>
      <dataRequirement>
        <type value="Immunization"/>
        <profile value="http://hl7.org/fhir/StructureDefinition/Immunization"/>
        <mustSupport value="status"/>
        <mustSupport value="isSubpotent"/>
        <mustSupport value="occurrence"/>
        <mustSupport value="vaccineCode"/>
        <mustSupport value="protocolApplied"/>
        <codeFilter>
          <path value="status"/>
          <code>
            <code value="completed"/>
          </code>
        </codeFilter>
        <codeFilter>
          <path value="vaccineCode"/>
          <valueSet value="http://smart.who.int/immunizations/ValueSet/IMMZ.Z.DE22"/>
        </codeFilter>
      </dataRequirement>
      <dataRequirement>
        <type value="Patient"/>
        <profile value="http://hl7.org/fhir/StructureDefinition/Patient"/>
        <mustSupport value="birthDate"/>
      </dataRequirement>
    </Library>
  </contained>
  <extension url="http://hl7.org/fhir/uv/cpg/StructureDefinition/cpg-knowledgeCapability">
    <valueCode value="computable"/>
  </extension>
  <extension url="http://hl7.org/fhir/uv/crmi/StructureDefinition/crmi-effectiveDataRequirements">
    <valueCanonical value="#effective-data-requirements"/>
  </extension>
  <url value="http://smart.who.int/immunizations/PlanDefinition/IMMZD18SVaricella2Doses"/>
  <version value="1.0.0"/>
  <name value="IMMZD18SVaricella2Doses"/>
  <title value="IMMZ.D18.S.Varicella.2-dose schedule"/>
  <type>
    <coding>
      <system value="http://terminology.hl7.org/CodeSystem/plan-definition-type"/>
      <code value="eca-rule"/>
    </coding>
  </type>
  <status value="draft"/>
  <experimental value="false"/>
  <date value="2026-03-31T13:54:17+00:00"/>
  <publisher value="WHO"/>
  <contact>
    <name value="WHO"/>
    <telecom>
      <system value="url"/>
      <value value="http://who.int"/>
    </telecom>
  </contact>
  <description value="IMMZ.D18.S.Varicella.2-dose schedule&#xA;2-dose schedule"/>
  <relatedArtifact>
    <type value="citation"/>
    <citation value="WHO recommendations for routine immunization - summary tables (January 2025)"/>
  </relatedArtifact>
  <library value="http://smart.who.int/immunizations/Library/IMMZD18SVaricella2DosesLogic"/>
  <action>
    <title value="Varicella dose 1"/>
    <description value="Provision of the varicella dose 1&#xA;Trigger event: Child's birth&#xA;Trigger pseudo: &#xA;Trigger date: &quot;Date of birth&quot;&#xA;Create condition: Depending on the goal of the vaccination programme, 1–2 doses should be given with the first dose administered at 12–18 months of age."/>
    <condition>
      <kind value="applicability"/>
      <expression>
        <description value="Varicella dose 1"/>
        <language value="text/cql-identifier"/>
        <expression value="Varicella dose 1"/>
      </expression>
    </condition>
    <definitionCanonical value="http://smart.who.int/immunizations/ActivityDefinition/IMMZD2DTCR"/>
    <dynamicValue>
      <path value="status"/>
      <expression>
        <language value="text/cql-expression"/>
        <expression value="'active'"/>
      </expression>
    </dynamicValue>
    <dynamicValue>
      <path value="payload.contentString"/>
      <expression>
        <language value="text/cql-identifier"/>
        <expression value="Varicella dose 1 Create"/>
      </expression>
    </dynamicValue>
    <dynamicValue>
      <path value="category.coding"/>
      <expression>
        <description value="Category of communication"/>
        <language value="text/cql-expression"/>
        <expression value="Code { system: 'http://terminology.hl7.org/CodeSystem/communication-category', code: 'alert' }"/>
      </expression>
    </dynamicValue>
    <dynamicValue>
      <path value="priority"/>
      <expression>
        <description value="Alert priority"/>
        <language value="text/cql-expression"/>
        <expression value="Code { system: 'http://hl7.org/fhir/request-priority', code: 'routine' }"/>
      </expression>
    </dynamicValue>
  </action>
  <action>
    <title value="Varicella dose 2"/>
    <description value="Provision of the varicella dose 2&#xA;Trigger event: First varicella dose from the primary series was administered&#xA;Trigger pseudo: Count of vaccines administered (where &quot;Vaccine type&quot; = &quot;Varicella-containing vaccines&quot; and &quot;Type of dose&quot; = &quot;Primary series&quot;) =1&#xA;Trigger date: &quot;Date and time of vaccination&quot; (where &quot;Vaccine type&quot; = &quot;Varicella-containing vaccines&quot;)&#xA;Create condition: The minimum interval between doses should be as recommended by the manufacturer, ranging from 4 weeks to 3 months."/>
    <condition>
      <kind value="applicability"/>
      <expression>
        <description value="Varicella dose 2"/>
        <language value="text/cql-identifier"/>
        <expression value="Varicella dose 2"/>
      </expression>
    </condition>
    <definitionCanonical value="http://smart.who.int/immunizations/ActivityDefinition/IMMZD2DTCR"/>
    <dynamicValue>
      <path value="status"/>
      <expression>
        <language value="text/cql-expression"/>
        <expression value="'active'"/>
      </expression>
    </dynamicValue>
    <dynamicValue>
      <path value="payload.contentString"/>
      <expression>
        <language value="text/cql-identifier"/>
        <expression value="Varicella dose 2 Create"/>
      </expression>
    </dynamicValue>
    <dynamicValue>
      <path value="category.coding"/>
      <expression>
        <description value="Category of communication"/>
        <language value="text/cql-expression"/>
        <expression value="Code { system: 'http://terminology.hl7.org/CodeSystem/communication-category', code: 'alert' }"/>
      </expression>
    </dynamicValue>
    <dynamicValue>
      <path value="priority"/>
      <expression>
        <description value="Alert priority"/>
        <language value="text/cql-expression"/>
        <expression value="Code { system: 'http://hl7.org/fhir/request-priority', code: 'routine' }"/>
      </expression>
    </dynamicValue>
  </action>
</PlanDefinition>