<?xml version="1.0" encoding="UTF-8"?>
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/*
  Copyright (c) 2011+, HL7, Inc.
  All rights reserved.
  
  Redistribution and use in source and binary forms, with or without modification, 
  are permitted provided that the following conditions are met:
  
   * Redistributions of source code must retain the above copyright notice, this 
     list of conditions and the following disclaimer.
   * Redistributions in binary form must reproduce the above copyright notice, 
     this list of conditions and the following disclaimer in the documentation 
     and/or other materials provided with the distribution.
   * Neither the name of HL7 nor the names of its contributors may be used to 
     endorse or promote products derived from this software without specific 
     prior written permission.
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
  POSSIBILITY OF SUCH DAMAGE.
  

  Generated on Mon, Mar 9, 2026 22:30+0000 for FHIR v6.0.0-ballot4 

  Note: the schemas &amp; schematrons do not contain all of the rules about what makes resources
  valid. Implementers will still need to be familiar with the content of the specification and with
  any profiles that apply to the resources in order to make a conformant implementation.

-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://hl7.org/fhir" xmlns:xhtml="http://www.w3.org/1999/xhtml" targetNamespace="http://hl7.org/fhir" elementFormDefault="qualified" version="1.0">
  <xs:include schemaLocation="fhir-base.xsd"/>
  <xs:element name="Evidence" type="Evidence">
    <xs:annotation>
      <xs:documentation xml:lang="en">The Evidence Resource provides a machine-interpretable expression of an evidence concept including the evidence variables (e.g., population, exposures/interventions, comparators, outcomes, measured variables, confounding variables), the statistics, and the certainty of this evidence.</xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name="Evidence">
    <xs:annotation>
      <xs:documentation xml:lang="en">The Evidence Resource provides a machine-interpretable expression of an evidence concept including the evidence variables (e.g., population, exposures/interventions, comparators, outcomes, measured variables, confounding variables), the statistics, and the certainty of this evidence.</xs:documentation>
      <xs:documentation xml:lang="en">If the element is present, it must have either a @value, an @id, or extensions</xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base="MetadataResource">
        <xs:sequence>
          <xs:element name="url" minOccurs="0" maxOccurs="1" type="uri">
            <xs:annotation>
              <xs:documentation xml:lang="en">An absolute URI that is used to identify this evidence when it is referenced in a specification, model, design or an instance; also called its canonical identifier. This SHOULD be globally unique and SHOULD be a literal address at which an authoritative instance of this summary is (or will be) published. This URL can be the target of a canonical reference. It SHALL remain the same when the summary is stored on different servers.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="identifier" minOccurs="0" maxOccurs="unbounded" type="Identifier">
            <xs:annotation>
              <xs:documentation xml:lang="en">A formal identifier that is used to identify this summary when it is represented in other formats, or referenced in a specification, model, design or an instance.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="version" minOccurs="0" maxOccurs="1" type="string">
            <xs:annotation>
              <xs:documentation xml:lang="en">The identifier that is used to identify this version of the summary when it is referenced in a specification, model, design or instance. This is an arbitrary value managed by the summary author and is not expected to be globally unique. For example, it might be a timestamp (e.g. yyyymmdd) if a managed version is not available. There is also no expectation that versions can be placed in a lexicographical sequence.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:choice minOccurs="0" maxOccurs="1" >
            <xs:annotation>
              <xs:documentation xml:lang="en">Indicates the mechanism used to compare versions to determine which is more current.</xs:documentation>
            </xs:annotation>
            <xs:element name="versionAlgorithmString" type="string"/>
            <xs:element name="versionAlgorithmCoding" type="Coding"/>
          </xs:choice>
          <xs:element name="name" minOccurs="0" maxOccurs="1" type="string">
            <xs:annotation>
              <xs:documentation xml:lang="en">A natural language name identifying the evidence. This name should be usable as an identifier for the module by machine processing applications such as code generation.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="title" minOccurs="0" maxOccurs="1" type="string">
            <xs:annotation>
              <xs:documentation xml:lang="en">A short, descriptive, user-friendly title for the summary.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="citeAs" minOccurs="0" maxOccurs="1" type="markdown">
            <xs:annotation>
              <xs:documentation xml:lang="en">Display of the suggested method of how to cite this Evidence.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="status" minOccurs="1" maxOccurs="1" type="PublicationStatus">
            <xs:annotation>
              <xs:documentation xml:lang="en">The status of this summary. Enables tracking the life-cycle of the content.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="experimental" minOccurs="0" maxOccurs="1" type="boolean">
            <xs:annotation>
              <xs:documentation xml:lang="en">A Boolean value to indicate that this resource is authored for testing purposes (or education/evaluation/marketing) and no version of this resource will ever be intended for genuine usage.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="date" minOccurs="0" maxOccurs="1" type="dateTime">
            <xs:annotation>
              <xs:documentation xml:lang="en">The date  (and optionally time) when the summary was last significantly changed. The date must change when the business version changes and it must change if the status code changes. In addition, it should change when the substantive content of the summary changes.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="approvalDate" minOccurs="0" maxOccurs="1" type="date">
            <xs:annotation>
              <xs:documentation xml:lang="en">The date on which the resource content was approved by the publisher. Approval happens once when the content is officially approved for usage.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="lastReviewDate" minOccurs="0" maxOccurs="1" type="date">
            <xs:annotation>
              <xs:documentation xml:lang="en">The date on which the resource content was last reviewed. Review happens periodically after approval but does not change the original approval date.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="author" minOccurs="0" maxOccurs="unbounded" type="ContactDetail">
            <xs:annotation>
              <xs:documentation xml:lang="en">An individiual, organization, or device primarily involved in the creation and maintenance of the content.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="publisher" minOccurs="0" maxOccurs="1" type="string">
            <xs:annotation>
              <xs:documentation xml:lang="en">The name of the organization or individual responsible for the release and ongoing maintenance of the evidence.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="contact" minOccurs="0" maxOccurs="unbounded" type="ContactDetail">
            <xs:annotation>
              <xs:documentation xml:lang="en">Contact details to assist a user in finding and communicating with the publisher.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="recorder" minOccurs="0" maxOccurs="unbounded" type="ContactDetail">
            <xs:annotation>
              <xs:documentation xml:lang="en">Who entered the data for the evidence.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="editor" minOccurs="0" maxOccurs="unbounded" type="ContactDetail">
            <xs:annotation>
              <xs:documentation xml:lang="en">An individiual, organization, or device primarily responsible for internal coherence of the content.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="reviewer" minOccurs="0" maxOccurs="unbounded" type="ContactDetail">
            <xs:annotation>
              <xs:documentation xml:lang="en">An individiual, organization, or device primarily responsible for review of some aspect of the content.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="endorser" minOccurs="0" maxOccurs="unbounded" type="ContactDetail">
            <xs:annotation>
              <xs:documentation xml:lang="en">An individiual, organization, or device responsible for officially endorsing the content for use in some setting.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="useContext" minOccurs="0" maxOccurs="unbounded" type="UsageContext">
            <xs:annotation>
              <xs:documentation xml:lang="en">The content was developed with a focus and intent of supporting the contexts that are listed. These contexts may be general categories (gender, age, ...) or may be references to specific programs (insurance plans, studies, ...) and may be used to assist with indexing and searching for appropriate evidence instances.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="purpose" minOccurs="0" maxOccurs="1" type="markdown">
            <xs:annotation>
              <xs:documentation xml:lang="en">Explanation of why this Evidence is needed and why it has been designed as it has.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="copyright" minOccurs="0" maxOccurs="1" type="markdown">
            <xs:annotation>
              <xs:documentation xml:lang="en">A copyright statement relating to the Evidence and/or its contents. Copyright statements are legal notices of intellectual property ownership and may include restrictions on the use and publishing of the Evidence.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="copyrightLabel" minOccurs="0" maxOccurs="1" type="string">
            <xs:annotation>
              <xs:documentation xml:lang="en">A short string (&lt;50 characters), suitable for inclusion in a page footer that identifies the copyright holder, effective period, and optionally whether rights are restricted. (e.g. 'All rights reserved', 'Some rights reserved').</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="relatesTo" type="Evidence.RelatesTo" minOccurs="0" maxOccurs="unbounded">
            <xs:annotation>
              <xs:documentation xml:lang="en">Relationships that this Evidence has with other FHIR or non-FHIR resources that already exist.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="description" minOccurs="0" maxOccurs="1" type="markdown">
            <xs:annotation>
              <xs:documentation xml:lang="en">A natural language summary of the evidence.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="assertion" minOccurs="0" maxOccurs="1" type="markdown">
            <xs:annotation>
              <xs:documentation xml:lang="en">Declarative description of the Evidence, such as conclusion or bottom line statement.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="note" minOccurs="0" maxOccurs="unbounded" type="Annotation">
            <xs:annotation>
              <xs:documentation xml:lang="en">Footnotes and/or explanatory notes.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="variableDefinition" type="Evidence.VariableDefinition" minOccurs="0" maxOccurs="unbounded">
            <xs:annotation>
              <xs:documentation xml:lang="en">Description, classification, and definition of a single variable. The collection of variables defines what the evidence is about.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="synthesisType" minOccurs="0" maxOccurs="unbounded" type="CodeableConcept">
            <xs:annotation>
              <xs:documentation xml:lang="en">The design of the synthesis (combination of studies) that produced this evidence. The design is described with any number of synthesis characteristics, such as type of meta-analysis.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="studyDesign" minOccurs="0" maxOccurs="unbounded" type="CodeableConcept">
            <xs:annotation>
              <xs:documentation xml:lang="en">The design of the study that produced this evidence. The design is described with any number of study design characteristics.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="statistic" type="Evidence.Statistic" minOccurs="0" maxOccurs="unbounded">
            <xs:annotation>
              <xs:documentation xml:lang="en">Values and parameters for a single statistic.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="certainty" type="Evidence.Certainty" minOccurs="0" maxOccurs="unbounded">
            <xs:annotation>
              <xs:documentation xml:lang="en">Assessment of certainty, confidence in the estimates, or quality of the evidence.</xs:documentation>
           </xs:annotation>
          </xs:element>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:complexType name="Evidence.RelatesTo">
    <xs:annotation>
      <xs:documentation xml:lang="en">The Evidence Resource provides a machine-interpretable expression of an evidence concept including the evidence variables (e.g., population, exposures/interventions, comparators, outcomes, measured variables, confounding variables), the statistics, and the certainty of this evidence.</xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base="BackboneElement">
        <xs:sequence>
          <xs:element name="type" minOccurs="1" maxOccurs="1" type="CodeableConcept">
            <xs:annotation>
              <xs:documentation xml:lang="en">The type of relationship to the related artifact.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:choice minOccurs="1" maxOccurs="1" >
            <xs:annotation>
              <xs:documentation xml:lang="en">The artifact that is related to this Evidence Resource.</xs:documentation>
            </xs:annotation>
            <xs:element name="targetUri" type="uri"/>
            <xs:element name="targetAttachment" type="Attachment"/>
            <xs:element name="targetCanonical" type="canonical"/>
            <xs:element name="targetReference" type="Reference"/>
            <xs:element name="targetMarkdown" type="markdown"/>
          </xs:choice>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:complexType name="Evidence.VariableDefinition">
    <xs:annotation>
      <xs:documentation xml:lang="en">The Evidence Resource provides a machine-interpretable expression of an evidence concept including the evidence variables (e.g., population, exposures/interventions, comparators, outcomes, measured variables, confounding variables), the statistics, and the certainty of this evidence.</xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base="BackboneElement">
        <xs:sequence>
          <xs:element name="description" minOccurs="0" maxOccurs="1" type="markdown">
            <xs:annotation>
              <xs:documentation xml:lang="en">A text description or summary of the variable.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="note" minOccurs="0" maxOccurs="unbounded" type="Annotation">
            <xs:annotation>
              <xs:documentation xml:lang="en">Footnotes and/or explanatory notes.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="variableRole" minOccurs="1" maxOccurs="1" type="EvidenceVariableRole">
            <xs:annotation>
              <xs:documentation xml:lang="en">Classification of the role of the variable.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="roleSubtype" minOccurs="0" maxOccurs="1" type="CodeableConcept">
            <xs:annotation>
              <xs:documentation xml:lang="en">Sub-classification of the role of the variable.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="comparatorCategory" minOccurs="0" maxOccurs="1" type="string">
            <xs:annotation>
              <xs:documentation xml:lang="en">The reference value used for comparison.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="observed" minOccurs="0" maxOccurs="1" type="Reference">
            <xs:annotation>
              <xs:documentation xml:lang="en">Definition of the actual variable related to the statistic(s), i.e., the population being the actual study sample or the measured variable (exposure, outcome, or covariate) being the actual observation that occurred or will occur in the study.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="intended" minOccurs="0" maxOccurs="1" type="Reference">
            <xs:annotation>
              <xs:documentation xml:lang="en">Definition of the intended variable related to the Evidence, i.e., the population, exposure, or outcome for which the statistical finding is being interpreted.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="directnessMatch" minOccurs="0" maxOccurs="1" type="CodeableConcept">
            <xs:annotation>
              <xs:documentation xml:lang="en">Indication of quality of match between intended variable to actual variable.</xs:documentation>
           </xs:annotation>
          </xs:element>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:complexType name="Evidence.Statistic">
    <xs:annotation>
      <xs:documentation xml:lang="en">The Evidence Resource provides a machine-interpretable expression of an evidence concept including the evidence variables (e.g., population, exposures/interventions, comparators, outcomes, measured variables, confounding variables), the statistics, and the certainty of this evidence.</xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base="BackboneElement">
        <xs:sequence>
          <xs:element name="description" minOccurs="0" maxOccurs="1" type="markdown">
            <xs:annotation>
              <xs:documentation xml:lang="en">A natural language summary of the statistic.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="note" minOccurs="0" maxOccurs="unbounded" type="Annotation">
            <xs:annotation>
              <xs:documentation xml:lang="en">Footnotes and/or explanatory notes.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="statisticType" minOccurs="0" maxOccurs="1" type="CodeableConcept">
            <xs:annotation>
              <xs:documentation xml:lang="en">Type of statistic, e.g., relative risk. The statistic type is a classification that formally defines the relationship between the variables (noted in Evidence.variableDefinition) and the value specification (noted in Evidence.statistic.quantity).</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="category" minOccurs="0" maxOccurs="1" type="CodeableConcept">
            <xs:annotation>
              <xs:documentation xml:lang="en">When the measured variable (outcome) is handled categorically, the category element is used to define which category the statistic is reporting.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="quantity" minOccurs="0" maxOccurs="1" type="Quantity">
            <xs:annotation>
              <xs:documentation xml:lang="en">Statistic value.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="numberOfEvents" minOccurs="0" maxOccurs="1" type="unsignedInt">
            <xs:annotation>
              <xs:documentation xml:lang="en">The number of events associated with the statistic, where the unit of analysis is different from numberAffected, sampleSize.knownDataCount and sampleSize.numberOfParticipants.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="numberAffected" minOccurs="0" maxOccurs="1" type="unsignedInt">
            <xs:annotation>
              <xs:documentation xml:lang="en">The number of participants affected where the unit of analysis is the same as sampleSize.knownDataCount and sampleSize.numberOfParticipants.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="sampleSize" type="Evidence.SampleSize" minOccurs="0" maxOccurs="1">
            <xs:annotation>
              <xs:documentation xml:lang="en">Count of participants in the study sample.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="attributeEstimate" type="Evidence.AttributeEstimate" minOccurs="0" maxOccurs="unbounded">
            <xs:annotation>
              <xs:documentation xml:lang="en">A statistical attribute of the statistic such as a measure of heterogeneity.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="modelCharacteristic" type="Evidence.ModelCharacteristic" minOccurs="0" maxOccurs="unbounded">
            <xs:annotation>
              <xs:documentation xml:lang="en">A component of the method to generate the statistic.</xs:documentation>
           </xs:annotation>
          </xs:element>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:complexType name="Evidence.SampleSize">
    <xs:annotation>
      <xs:documentation xml:lang="en">The Evidence Resource provides a machine-interpretable expression of an evidence concept including the evidence variables (e.g., population, exposures/interventions, comparators, outcomes, measured variables, confounding variables), the statistics, and the certainty of this evidence.</xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base="BackboneElement">
        <xs:sequence>
          <xs:element name="description" minOccurs="0" maxOccurs="1" type="markdown">
            <xs:annotation>
              <xs:documentation xml:lang="en">Human-readable summary of study sample size. A human-readable string to clarify or explain concepts about the sample size.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="note" minOccurs="0" maxOccurs="unbounded" type="Annotation">
            <xs:annotation>
              <xs:documentation xml:lang="en">Footnote or explanatory note about the sample size.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="numberOfStudies" minOccurs="0" maxOccurs="1" type="unsignedInt">
            <xs:annotation>
              <xs:documentation xml:lang="en">Count of studies or samples combined to become the total sample for the statistic.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="numberOfParticipants" minOccurs="0" maxOccurs="1" type="unsignedInt">
            <xs:annotation>
              <xs:documentation xml:lang="en">Count of members in the total sample for the statistic.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="knownDataCount" minOccurs="0" maxOccurs="1" type="unsignedInt">
            <xs:annotation>
              <xs:documentation xml:lang="en">Number of participants with known results for measured variables.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="numberAnalyzed" minOccurs="0" maxOccurs="1" type="unsignedInt">
            <xs:annotation>
              <xs:documentation xml:lang="en">Total number of participants who were analayzed.</xs:documentation>
           </xs:annotation>
          </xs:element>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:complexType name="Evidence.AttributeEstimate">
    <xs:annotation>
      <xs:documentation xml:lang="en">The Evidence Resource provides a machine-interpretable expression of an evidence concept including the evidence variables (e.g., population, exposures/interventions, comparators, outcomes, measured variables, confounding variables), the statistics, and the certainty of this evidence.</xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base="BackboneElement">
        <xs:sequence>
          <xs:element name="description" minOccurs="0" maxOccurs="1" type="markdown">
            <xs:annotation>
              <xs:documentation xml:lang="en">Human-readable summary of the estimate.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="note" minOccurs="0" maxOccurs="unbounded" type="Annotation">
            <xs:annotation>
              <xs:documentation xml:lang="en">Footnote or explanatory note about the estimate.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="type" minOccurs="0" maxOccurs="1" type="CodeableConcept">
            <xs:annotation>
              <xs:documentation xml:lang="en">The type of attribute estimate, e.g., confidence interval or p value.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="quantity" minOccurs="0" maxOccurs="1" type="Quantity">
            <xs:annotation>
              <xs:documentation xml:lang="en">The singular quantity of the attribute estimate, for attribute estimates represented as single values, which may include a unit of measure.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="level" minOccurs="0" maxOccurs="1" type="decimal">
            <xs:annotation>
              <xs:documentation xml:lang="en">Use 0.95 for a 95% confidence interval.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="range" minOccurs="0" maxOccurs="1" type="Range">
            <xs:annotation>
              <xs:documentation xml:lang="en">Lower and upper bound values of the attribute estimate.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="attributeEstimate" type="Evidence.AttributeEstimate" minOccurs="0" maxOccurs="unbounded">
            <xs:annotation>
              <xs:documentation xml:lang="en">A nested attribute estimate; which is the attribute estimate of an attribute estimate.</xs:documentation>
           </xs:annotation>
          </xs:element>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:complexType name="Evidence.ModelCharacteristic">
    <xs:annotation>
      <xs:documentation xml:lang="en">The Evidence Resource provides a machine-interpretable expression of an evidence concept including the evidence variables (e.g., population, exposures/interventions, comparators, outcomes, measured variables, confounding variables), the statistics, and the certainty of this evidence.</xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base="BackboneElement">
        <xs:sequence>
          <xs:element name="code" minOccurs="1" maxOccurs="1" type="CodeableConcept">
            <xs:annotation>
              <xs:documentation xml:lang="en">Description of a component of the method to generate the statistic.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:choice minOccurs="0" maxOccurs="1" >
            <xs:annotation>
              <xs:documentation xml:lang="en">Further specification of the value of the component of the method to generate the statistic.</xs:documentation>
            </xs:annotation>
            <xs:element name="valueQuantity" type="Quantity"/>
            <xs:element name="valueRange" type="Range"/>
            <xs:element name="valueCodeableConcept" type="CodeableConcept"/>
          </xs:choice>
          <xs:element name="intended" minOccurs="0" maxOccurs="1" type="boolean">
            <xs:annotation>
              <xs:documentation xml:lang="en">The plan for analysis.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="applied" minOccurs="0" maxOccurs="1" type="boolean">
            <xs:annotation>
              <xs:documentation xml:lang="en">This model characteristic is part of the analysis that was applied, whether or not the analysis followed the plan.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="variable" type="Evidence.Variable" minOccurs="0" maxOccurs="unbounded">
            <xs:annotation>
              <xs:documentation xml:lang="en">A variable adjusted for in the adjusted analysis.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="attribute" type="Evidence.AttributeEstimate" minOccurs="0" maxOccurs="unbounded">
            <xs:annotation>
              <xs:documentation xml:lang="en">An attribute of the model characteristic.</xs:documentation>
           </xs:annotation>
          </xs:element>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:complexType name="Evidence.Variable">
    <xs:annotation>
      <xs:documentation xml:lang="en">The Evidence Resource provides a machine-interpretable expression of an evidence concept including the evidence variables (e.g., population, exposures/interventions, comparators, outcomes, measured variables, confounding variables), the statistics, and the certainty of this evidence.</xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base="BackboneElement">
        <xs:sequence>
          <xs:element name="variableDefinition" minOccurs="1" maxOccurs="1" type="Reference">
            <xs:annotation>
              <xs:documentation xml:lang="en">Description and definition of the variable.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="handling" minOccurs="0" maxOccurs="1" type="CodeableConcept">
            <xs:annotation>
              <xs:documentation xml:lang="en">How the variable is classified for use in adjusted analysis.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="valueCategory" minOccurs="0" maxOccurs="unbounded" type="CodeableConcept">
            <xs:annotation>
              <xs:documentation xml:lang="en">Qualitative label used for grouping values of a dichotomous, ordinal, or polychotomous variable.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="valueQuantity" minOccurs="0" maxOccurs="unbounded" type="Quantity">
            <xs:annotation>
              <xs:documentation xml:lang="en">Quantitative label used for grouping values of a dichotomous, ordinal, or polychotomous variable.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="valueRange" minOccurs="0" maxOccurs="unbounded" type="Range">
            <xs:annotation>
              <xs:documentation xml:lang="en">Range of quantitative labels used for grouping values of a dichotomous, ordinal, or polychotomous variable.</xs:documentation>
           </xs:annotation>
          </xs:element>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:complexType name="Evidence.Certainty">
    <xs:annotation>
      <xs:documentation xml:lang="en">The Evidence Resource provides a machine-interpretable expression of an evidence concept including the evidence variables (e.g., population, exposures/interventions, comparators, outcomes, measured variables, confounding variables), the statistics, and the certainty of this evidence.</xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base="BackboneElement">
        <xs:sequence>
          <xs:element name="description" minOccurs="0" maxOccurs="1" type="markdown">
            <xs:annotation>
              <xs:documentation xml:lang="en">Textual description of certainty.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="note" minOccurs="0" maxOccurs="unbounded" type="Annotation">
            <xs:annotation>
              <xs:documentation xml:lang="en">Footnotes and/or explanatory notes.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="type" minOccurs="0" maxOccurs="1" type="CodeableConcept">
            <xs:annotation>
              <xs:documentation xml:lang="en">Aspect of certainty being rated.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="rating" minOccurs="0" maxOccurs="1" type="CodeableConcept">
            <xs:annotation>
              <xs:documentation xml:lang="en">Assessment or judgement of the aspect.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="rater" minOccurs="0" maxOccurs="unbounded" type="string">
            <xs:annotation>
              <xs:documentation xml:lang="en">Individual or group who did the rating.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="subcomponent" type="Evidence.Certainty" minOccurs="0" maxOccurs="unbounded">
            <xs:annotation>
              <xs:documentation xml:lang="en">A domain or subdomain of certainty.</xs:documentation>
           </xs:annotation>
          </xs:element>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:simpleType name="EvidenceVariableRoleEnum">
    <xs:restriction base="code-primitive">
      <xs:enumeration value="population">
        <xs:annotation>
          <xs:documentation xml:lang="en">Population</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="exposure">
        <xs:annotation>
          <xs:documentation xml:lang="en">Exposure</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="outcome">
        <xs:annotation>
          <xs:documentation xml:lang="en">Outcome</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="covariate">
        <xs:annotation>
          <xs:documentation xml:lang="en">Covariate</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name="EvidenceVariableRole">
    <xs:annotation>
      <xs:documentation xml:lang="en"></xs:documentation>
      <xs:documentation xml:lang="en">If the element is present, it must have either a @value, an @id, or extensions</xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base="Element">
        <xs:attribute name="value" type="EvidenceVariableRoleEnum" use="optional"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
</xs:schema>
