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<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="StructureDefinition" />
  <meta>
    <lastUpdated value="2019-10-24T11:53:00+11:00" />
  </meta>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="5" />
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="fhir" />
  </extension>
  <url value="http://hl7.org/fhir/StructureDefinition/StructureDefinition" />
  <name value="StructureDefinition" />
  <status value="draft" />
  <date value="2019-10-24T11:53:00+11:00" />
  <publisher value="Health Level Seven International (FHIR Infrastructure)" />
  <contact>
    <telecom>
      <system value="url" />
      <value value="http://hl7.org/fhir" />
    </telecom>
  </contact>
  <contact>
    <telecom>
      <system value="url" />
      <value value="http://www.hl7.org/Special/committees/fiwg/index.cfm" />
    </telecom>
  </contact>
  <description value="Base StructureDefinition for StructureDefinition Resource" />
  <fhirVersion value="3.0.2" />
  <mapping>
    <identity value="rim" />
    <uri value="http://hl7.org/v3" />
    <name value="RIM Mapping" />
  </mapping>
  <mapping>
    <identity value="w5" />
    <uri value="http://hl7.org/fhir/w5" />
    <name value="W5 Mapping" />
  </mapping>
  <mapping>
    <identity value="iso11179" />
    <uri value="http://metadata-standards.org/11179/" />
    <name value="ISO 11179" />
  </mapping>
  <mapping>
    <identity value="objimpl" />
    <uri value="http://hl7.org/fhir/object-implementation" />
    <name value="Object Implementation Information" />
  </mapping>
  <kind value="resource" />
  <abstract value="false" />
  <type value="StructureDefinition" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/DomainResource">
    <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-codegen-super">
      <valueString value="MetadataResource" />
    </extension>
  </baseDefinition>
  <derivation value="specialization" />
  <snapshot>
    <element id="StructureDefinition">
      <path value="StructureDefinition" />
      <short value="Structural Definition" />
      <definition value="A definition of a FHIR structure. This resource is used to describe the underlying resources, data types defined in FHIR, and also for describing extensions and constraints on resources and data types." />
      <alias value="Template" />
      <alias value="Profile" />
      <min value="0" />
      <max value="*" />
      <constraint>
        <key value="dom-2" />
        <severity value="error" />
        <human value="If the resource is contained in another resource, it SHALL NOT contain nested Resources" />
        <expression value="contained.contained.empty()" />
        <xpath value="not(parent::f:contained and f:contained)" />
        <source value="DomainResource" />
      </constraint>
      <constraint>
        <key value="dom-1" />
        <severity value="error" />
        <human value="If the resource is contained in another resource, it SHALL NOT contain any narrative" />
        <expression value="contained.text.empty()" />
        <xpath value="not(parent::f:contained and f:text)" />
        <source value="DomainResource" />
      </constraint>
      <constraint>
        <key value="dom-4" />
        <severity value="error" />
        <human value="If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated" />
        <expression value="contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()" />
        <xpath value="not(exists(f:contained/*/f:meta/f:versionId)) and not(exists(f:contained/*/f:meta/f:lastUpdated))" />
        <source value="DomainResource" />
      </constraint>
      <constraint>
        <key value="dom-3" />
        <severity value="error" />
        <human value="If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource" />
        <expression value="contained.where(('#'+id in %resource.descendants().reference).not()).empty()" />
        <xpath value="not(exists(for $id in f:contained/*/@id return $id[not(ancestor::f:contained/parent::*/descendant::f:reference/@value=concat('#', $id))]))" />
        <source value="DomainResource" />
      </constraint>
      <constraint>
        <key value="sdf-9" />
        <requirements value="Because these 3 fields seem to be have overlapping meaning with the ones in the root of StructureDefinition" />
        <severity value="error" />
        <human value="In any snapshot or differential, no label, code or requirements on the an element without a &quot;.&quot; in the path (e.g. the first element)" />
        <expression value="children().element.where(path.contains('.').not()).label.empty() and children().element.where(path.contains('.').not()).code.empty() and children().element.where(path.contains('.').not()).requirements.empty()" />
        <xpath value="not(exists(f:snapshot/f:element[not(contains(f:path/@value, '.')) and (f:label or f:code or f:requirements)])) and not(exists(f:differential/f:element[not(contains(f:path/@value, '.')) and (f:label or f:code or f:requirements)]))" />
      </constraint>
      <constraint>
        <key value="sdf-19" />
        <requirements value="custom types only in logical models" />
        <severity value="error" />
        <human value="Custom types can only be used in logical models" />
        <expression value="kind = 'logical' or (differential.element.type.code.all(hasValue() implies matches('^[a-zA-Z0-9]+$')) and snapshot.element.type.code.all(hasValue() implies matches('^[a-zA-Z0-9]+$')))" />
        <xpath value="f:kind/@value = 'logical' or count(f:differential/f:element/f:type/f:code[@value and not(matches(string(@value), '^[a-zA-Z0-9]+$'))]|f:snapshot/f:element/f:type/f:code[@value and not(matches(string(@value), '^[a-zA-Z0-9]+$'))]) =0" />
      </constraint>
      <constraint>
        <key value="sdf-16" />
        <requirements value="element ids need to be unique" />
        <severity value="error" />
        <human value="All element definitions must have unique ids (snapshot)" />
        <expression value="snapshot.element.id.trace('ids').isDistinct()" />
        <xpath value="count(*/f:element)=count(*/f:element/@id)" />
      </constraint>
      <constraint>
        <key value="sdf-18" />
        <requirements value="contextInvariant" />
        <severity value="error" />
        <human value="Context Invariants can only be used for extensions" />
        <expression value="contextInvariant.exists() implies type = 'Extension'" />
        <xpath value="not(exists(f:contextInvariant)) or (f:type/@value = 'Extension')" />
      </constraint>
      <constraint>
        <key value="sdf-17" />
        <requirements value="element ids need to be unique" />
        <severity value="error" />
        <human value="All element definitions must have unique ids (diff)" />
        <expression value="differential.element.id.trace('ids').isDistinct()" />
        <xpath value="count(*/f:element)=count(*/f:element/@id)" />
      </constraint>
      <constraint>
        <key value="sdf-11" />
        <requirements value="Ensure that the type is not inconsistent with the other information in the structure" />
        <severity value="error" />
        <human value="If there's a type, its content must match the path name in the first element of a snapshot" />
        <expression value="snapshot.empty() or snapshot.element.first().path = type" />
        <xpath value="not(exists(f:snapshot)) or (f:type/@value = f:snapshot/f:element[1]/f:path/@value)" />
      </constraint>
      <constraint>
        <key value="sdf-14" />
        <requirements value="elements have id" />
        <severity value="error" />
        <human value="All element definitions must have an id" />
        <expression value="snapshot.element.all(id.exists()) and differential.element.all(id.exists())" />
        <xpath value="count(*/f:element)=count(*/f:element/@id)" />
      </constraint>
      <constraint>
        <key value="sdf-1" />
        <severity value="error" />
        <human value="Element paths must be unique unless the structure is a constraint" />
        <expression value="derivation = 'constraint' or snapshot.element.select(path).isDistinct()" />
        <xpath value="(f:derivation/@value = 'constraint') or (count(f:snapshot/f:element) = count(distinct-values(f:snapshot/f:element/f:path/@value)))" />
      </constraint>
      <constraint>
        <key value="sdf-7" />
        <severity value="error" />
        <human value="If the structure describes a base Resource or Type, the URL has to start with &quot;http://hl7.org/fhir/StructureDefinition/&quot; and the tail must match the id" />
        <expression value="(derivation = 'constraint') or (kind = 'logical') or (url = 'http://hl7.org/fhir/StructureDefinition/'+id)" />
        <xpath value="(f:derivation/@value = 'constraint') or (f:kind/@value = 'logical') or (f:url/@value=concat('http://hl7.org/fhir/StructureDefinition/', f:id/@value))" />
      </constraint>
      <constraint>
        <key value="sdf-6" />
        <severity value="error" />
        <human value="A structure must have either a differential, or a snapshot (or both)" />
        <expression value="snapshot.exists() or differential.exists()" />
        <xpath value="exists(f:snapshot) or exists(f:differential)" />
      </constraint>
      <constraint>
        <key value="sdf-5" />
        <severity value="error" />
        <human value="If the structure defines an extension then the structure must have context information" />
        <expression value="type != 'Extension' or derivation = 'specialization' or (context.exists() and contextType.exists())" />
        <xpath value="not(f:type/@value = 'extension') or (f:derivation/@value = 'specialization') or (exists(f:context) and exists(f:contextType))" />
      </constraint>
      <constraint>
        <key value="sdf-4" />
        <requirements value="Ensure that the base types are abstract" />
        <severity value="error" />
        <human value="If the structure is not abstract, then there SHALL be a baseDefinition" />
        <expression value="abstract = true or baseDefinition.exists()" />
        <xpath value="(f:abstract/@value=true()) or exists(f:baseDefinition)" />
      </constraint>
      <mapping>
        <identity value="rim" />
        <map value="Entity. Role, or Act" />
      </mapping>
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
      <mapping>
        <identity value="w5" />
        <map value="conformance.content" />
      </mapping>
    </element>
    <element id="StructureDefinition.id">
      <path value="StructureDefinition.id" />
      <short value="Logical id of this artifact" />
      <definition value="The logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes." />
      <comment value="The only time that a resource does not have an id is when it is being submitted to the server using a create operation." />
      <min value="0" />
      <max value="1" />
      <base>
        <path value="Resource.id" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="id" />
      </type>
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.meta">
      <path value="StructureDefinition.meta" />
      <short value="Metadata about the resource" />
      <definition value="The metadata about the resource. This is content that is maintained by the infrastructure. Changes to the content may not always be associated with version changes to the resource." />
      <min value="0" />
      <max value="1" />
      <base>
        <path value="Resource.meta" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="Meta" />
      </type>
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.implicitRules">
      <path value="StructureDefinition.implicitRules" />
      <short value="A set of rules under which this content was created" />
      <definition value="A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content." />
      <comment value="Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element. &#xA;&#xA;This element is labelled as a modifier because the implicit rules may provide additional knowledge about the resource that modifies it's meaning or interpretation." />
      <min value="0" />
      <max value="1" />
      <base>
        <path value="Resource.implicitRules" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="uri" />
      </type>
      <isModifier value="true" />
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.language">
      <path value="StructureDefinition.language" />
      <short value="Language of the resource content" />
      <definition value="The base language in which the resource is written." />
      <comment value="Language is provided to support indexing and accessibility (typically, services such as text to speech use the language tag). The html language tag in the narrative applies  to the narrative. The language tag on the resource may be used to specify the language of other presentations generated from the data in the resource  Not all the content has to be in the base language. The Resource.language should not be assumed to apply to the narrative automatically. If a language is specified, it should it also be specified on the div element in the html (see rules in HTML5 for information about the relationship between xml:lang and the html lang attribute)." />
      <min value="0" />
      <max value="1" />
      <base>
        <path value="Resource.language" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="code" />
      </type>
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-maxValueSet">
          <valueReference>
            <reference value="http://hl7.org/fhir/ValueSet/all-languages" />
          </valueReference>
        </extension>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="Language" />
        </extension>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-isCommonBinding">
          <valueBoolean value="true" />
        </extension>
        <strength value="extensible" />
        <description value="A human language." />
        <valueSetReference>
          <reference value="http://hl7.org/fhir/ValueSet/languages" />
        </valueSetReference>
      </binding>
    </element>
    <element id="StructureDefinition.text">
      <path value="StructureDefinition.text" />
      <short value="Text summary of the resource, for human interpretation" />
      <definition value="A human-readable narrative that contains a summary of the resource, and may be used to represent the content of the resource to a human. The narrative need not encode all the structured data, but is required to contain sufficient detail to make it &quot;clinically safe&quot; for a human to just read the narrative. Resource definitions may define what content should be represented in the narrative to ensure clinical safety." />
      <comment value="Contained resources do not have narrative. Resources that are not contained SHOULD have a narrative. In some cases, a resource may only have text with little or no additional discrete data (as long as all minOccurs=1 elements are satisfied).  This may be necessary for data from legacy systems where information is captured as a &quot;text blob&quot; or where text is additionally entered raw or narrated and encoded in formation is added later." />
      <alias value="narrative" />
      <alias value="html" />
      <alias value="xhtml" />
      <alias value="display" />
      <min value="0" />
      <max value="1" />
      <base>
        <path value="DomainResource.text" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="Narrative" />
      </type>
      <condition value="dom-1" />
      <mapping>
        <identity value="rim" />
        <map value="Act.text?" />
      </mapping>
    </element>
    <element id="StructureDefinition.contained">
      <path value="StructureDefinition.contained" />
      <short value="Contained, inline Resources" />
      <definition value="These resources do not have an independent existence apart from the resource that contains them - they cannot be identified independently, and nor can they have their own independent transaction scope." />
      <comment value="This should never be done when the content can be identified properly, as once identification is lost, it is extremely difficult (and context dependent) to restore it again." />
      <alias value="inline resources" />
      <alias value="anonymous resources" />
      <alias value="contained resources" />
      <min value="0" />
      <max value="*" />
      <base>
        <path value="DomainResource.contained" />
        <min value="0" />
        <max value="*" />
      </base>
      <type>
        <code value="Resource" />
      </type>
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
    <element id="StructureDefinition.extension">
      <path value="StructureDefinition.extension" />
      <short value="Additional Content defined by implementations" />
      <definition value="May be used to represent additional information that is not part of the basic definition of the resource. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension." />
      <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone." />
      <alias value="extensions" />
      <alias value="user content" />
      <min value="0" />
      <max value="*" />
      <base>
        <path value="DomainResource.extension" />
        <min value="0" />
        <max value="*" />
      </base>
      <type>
        <code value="Extension" />
      </type>
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
    <element id="StructureDefinition.modifierExtension">
      <path value="StructureDefinition.modifierExtension" />
      <short value="Extensions that cannot be ignored" />
      <definition value="May be used to represent additional information that is not part of the basic definition of the resource, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions." />
      <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone." />
      <alias value="extensions" />
      <alias value="user content" />
      <min value="0" />
      <max value="*" />
      <base>
        <path value="DomainResource.modifierExtension" />
        <min value="0" />
        <max value="*" />
      </base>
      <type>
        <code value="Extension" />
      </type>
      <isModifier value="true" />
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
    <element id="StructureDefinition.url">
      <path value="StructureDefinition.url" />
      <short value="Logical URI to reference this structure definition (globally unique)" />
      <definition value="An absolute URI that is used to identify this structure definition when it is referenced in a specification, model, design or an instance. This SHALL be a URL, SHOULD be globally unique, and SHOULD be an address at which this structure definition is (or will be) published. The URL SHOULD include the major version of the structure definition. For more information see [Technical and Business Versions](resource.html#versions)." />
      <comment value="Can be a urn:uuid: or a urn:oid:, but real http: addresses are preferred.  Multiple instances may share the same url if they have a distinct version." />
      <requirements value="Allows the structure definition to be referenced by a single globally unique identifier." />
      <alias value="url" />
      <alias value="authoritative-url" />
      <alias value="destination" />
      <alias value="identity" />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="uri" />
      </type>
      <isSummary value="true" />
      <mapping>
        <identity value="w5" />
        <map value="id" />
      </mapping>
    </element>
    <element id="StructureDefinition.identifier">
      <path value="StructureDefinition.identifier" />
      <short value="Additional identifier for the structure definition" />
      <definition value="A formal identifier that is used to identify this structure definition when it is represented in other formats, or referenced in a specification, model, design or an instance." />
      <comment value="Typically, this is used for identifiers that can go in an HL7 V3 II (instance identifier) data type, e.g., to identify this structure definition outside of FHIR, where it is not possible to use the logical URI." />
      <requirements value="Allows externally provided and/or usable business identifiers to be easily associated with the module." />
      <min value="0" />
      <max value="*" />
      <type>
        <code value="Identifier" />
      </type>
      <isSummary value="true" />
      <mapping>
        <identity value="iso11179" />
        <map value="Identifier part" />
      </mapping>
      <mapping>
        <identity value="objimpl" />
        <map value="no-gen-base" />
      </mapping>
      <mapping>
        <identity value="w5" />
        <map value="id" />
      </mapping>
    </element>
    <element id="StructureDefinition.version">
      <path value="StructureDefinition.version" />
      <short value="Business version of the structure definition" />
      <definition value="The identifier that is used to identify this version of the structure definition when it is referenced in a specification, model, design or instance. This is an arbitrary value managed by the structure definition 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." />
      <comment value="There may be different structure definition instances that have the same identifier but different versions.  The version can be appended to the url in a reference to allow a refrence to a particular business version of the structure definition with the format [url]|[version]." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="string" />
      </type>
      <isSummary value="true" />
      <mapping>
        <identity value="iso11179" />
        <map value="Version" />
      </mapping>
      <mapping>
        <identity value="w5" />
        <map value="id.version" />
      </mapping>
    </element>
    <element id="StructureDefinition.name">
      <path value="StructureDefinition.name" />
      <short value="Name for this structure definition (computer friendly)" />
      <definition value="A natural language name identifying the structure definition. This name should be usable as an identifier for the module by machine processing applications such as code generation." />
      <comment value="The name is not expected to be globally unique. The name should be a simple alpha-numeric type name to ensure that it is computable friendly." />
      <requirements value="Support human navigation and code generation." />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="string" />
      </type>
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.title">
      <path value="StructureDefinition.title" />
      <short value="Name for this structure definition (human friendly)" />
      <definition value="A short, descriptive, user-friendly title for the structure definition." />
      <comment value="This name does not need to be machine-processing friendly and may contain punctuation, white-space, etc. Applications don't have to use this name, but can always fall back to it. The title also corresponds to the label for the root element." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="string" />
      </type>
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.status">
      <path value="StructureDefinition.status" />
      <short value="draft | active | retired | unknown" />
      <definition value="The status of this structure definition. Enables tracking the life-cycle of the content." />
      <comment value="Allows filtering of structure definitions that are appropriate for use vs. not.  &#xA;This is labeled as &quot;Is Modifier&quot; because applications should not use a retired structure definition without due consideration." />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="code" />
      </type>
      <isModifier value="true" />
      <isSummary value="true" />
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="PublicationStatus" />
        </extension>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-isCommonBinding">
          <valueBoolean value="true" />
        </extension>
        <strength value="required" />
        <description value="The lifecycle status of a Value Set or Concept Map." />
        <valueSetReference>
          <reference value="http://hl7.org/fhir/ValueSet/publication-status" />
        </valueSetReference>
      </binding>
      <mapping>
        <identity value="iso11179" />
        <map value="Registration status" />
      </mapping>
      <mapping>
        <identity value="w5" />
        <map value="status" />
      </mapping>
    </element>
    <element id="StructureDefinition.experimental">
      <path value="StructureDefinition.experimental" />
      <short value="For testing purposes, not real usage" />
      <definition value="A boolean value to indicate that this structure definition is authored for testing purposes (or education/evaluation/marketing), and is not intended to be used for genuine usage." />
      <comment value="Allows filtering of structure definition that are appropriate for use vs. not. This is labeled as &quot;Is Modifier&quot; because applications should not use an experimental structure definition in production." />
      <requirements value="Enables experimental content to be developed following the same lifecycle that would be used for a production-level structure definition." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="boolean" />
      </type>
      <isModifier value="true" />
      <isSummary value="true" />
      <mapping>
        <identity value="iso11179" />
        <map value="Registration status" />
      </mapping>
      <mapping>
        <identity value="w5" />
        <map value="class" />
      </mapping>
    </element>
    <element id="StructureDefinition.date">
      <path value="StructureDefinition.date" />
      <short value="Date this was last changed" />
      <definition value="The date  (and optionally time) when the structure definition was published. The date must change if and 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 structure definition changes." />
      <comment value="Note that this is not the same as the resource last-modified-date, since the resource may be a secondary representation of the structure definition. Additional specific dates may be added as extensions or be found by consulting Provenances associated with past versions of the resource." />
      <alias value="Revision Date" />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="dateTime" />
      </type>
      <isSummary value="true" />
      <mapping>
        <identity value="w5" />
        <map value="when.recorded" />
      </mapping>
    </element>
    <element id="StructureDefinition.publisher">
      <path value="StructureDefinition.publisher" />
      <short value="Name of the publisher (organization or individual)" />
      <definition value="The name of the individual or organization that published the structure definition." />
      <comment value="Usually an organization, but may be an individual. The publisher (or steward) of the structure definition is the organization or individual primarily responsible for the maintenance and upkeep of the structure definition. This is not necessarily the same individual or organization that developed and initially authored the content. The publisher is the primary point of contact for questions or issues with the structure definition. This item SHOULD be populated unless the information is available from context." />
      <requirements value="Helps establish the &quot;authority/credibility&quot; of the structure definition.  May also allow for contact." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="string" />
      </type>
      <isSummary value="true" />
      <mapping>
        <identity value="iso11179" />
        <map value="Registration Authority" />
      </mapping>
      <mapping>
        <identity value="w5" />
        <map value="who.witness" />
      </mapping>
    </element>
    <element id="StructureDefinition.contact">
      <path value="StructureDefinition.contact" />
      <short value="Contact details for the publisher" />
      <definition value="Contact details to assist a user in finding and communicating with the publisher." />
      <comment value="May be a web site, an email address, a telephone number, etc." />
      <min value="0" />
      <max value="*" />
      <type>
        <code value="ContactDetail" />
      </type>
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.description">
      <path value="StructureDefinition.description" />
      <short value="Natural language description of the structure definition" />
      <definition value="A free text natural language description of the structure definition from a consumer's perspective." />
      <comment value="This description can be used to capture details such as why the structure definition was built, comments about misuse, instructions for clinical use and interpretation, literature references, examples from the paper world, etc. It is not a rendering of the structure definition as conveyed in the 'text' field of the resource itself. This item SHOULD be populated unless the information is available from context (e.g. the language of the profile is presumed to be the predominant language in the place the profile was created)." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="markdown" />
      </type>
    </element>
    <element id="StructureDefinition.useContext">
      <path value="StructureDefinition.useContext" />
      <short value="Context the content is intended to support" />
      <definition value="The content was developed with a focus and intent of supporting the contexts that are listed. These terms may be used to assist with indexing and searching for appropriate structure definition instances." />
      <comment value="When multiple useContexts are specified, there is no expectation whether all or any of the contexts apply." />
      <requirements value="Assist in searching for appropriate content." />
      <min value="0" />
      <max value="*" />
      <type>
        <code value="UsageContext" />
      </type>
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.jurisdiction">
      <path value="StructureDefinition.jurisdiction" />
      <short value="Intended jurisdiction for structure definition (if applicable)" />
      <definition value="A legal or geographic region in which the structure definition is intended to be used." />
      <comment value="It may be possible for the structure definition to be used in jurisdictions other than those for which it was originally designed or intended." />
      <min value="0" />
      <max value="*" />
      <type>
        <code value="CodeableConcept" />
      </type>
      <isSummary value="true" />
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="Jurisdiction" />
        </extension>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-isCommonBinding">
          <valueBoolean value="true" />
        </extension>
        <strength value="extensible" />
        <description value="Countries and regions within which this artifact is targeted for use" />
        <valueSetReference>
          <reference value="http://hl7.org/fhir/ValueSet/jurisdiction" />
        </valueSetReference>
      </binding>
    </element>
    <element id="StructureDefinition.purpose">
      <path value="StructureDefinition.purpose" />
      <short value="Why this structure definition is defined" />
      <definition value="Explaination of why this structure definition is needed and why it has been designed as it has." />
      <comment value="This element does not describe the usage of the structure definition Instead  it provides traceability of ''why'' the resource is either needed or ''why'' it is defined as it is.  This may be used to point to source materials or specifications that drove the structure of this structure definition." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="markdown" />
      </type>
      <mapping>
        <identity value="objimpl" />
        <map value="no-gen-base" />
      </mapping>
      <mapping>
        <identity value="w5" />
        <map value="why" />
      </mapping>
    </element>
    <element id="StructureDefinition.copyright">
      <path value="StructureDefinition.copyright" />
      <short value="Use and/or publishing restrictions" />
      <definition value="A copyright statement relating to the structure definition and/or its contents. Copyright statements are generally legal restrictions on the use and publishing of the structure definition." />
      <requirements value="Consumers must be able to determine any legal restrictions on the use of the structure definition and/or its content." />
      <alias value="License" />
      <alias value="Restrictions" />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="markdown" />
      </type>
      <mapping>
        <identity value="objimpl" />
        <map value="no-gen-base" />
      </mapping>
    </element>
    <element id="StructureDefinition.keyword">
      <path value="StructureDefinition.keyword" />
      <short value="Assist with indexing and finding" />
      <definition value="A set of key words or terms from external terminologies that may be used to assist with indexing and searching of templates." />
      <requirements value="Assist in searching for appropriate StructureDefinitions." />
      <min value="0" />
      <max value="*" />
      <type>
        <code value="Coding" />
      </type>
      <isSummary value="true" />
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="StructureDefinitionCode" />
        </extension>
        <strength value="example" />
        <description value="Codes for the meaning of the defined structure (SNOMED CT and LOINC codes, as an example)." />
        <valueSetReference>
          <reference value="http://hl7.org/fhir/ValueSet/profile-code" />
        </valueSetReference>
      </binding>
      <mapping>
        <identity value="iso11179" />
        <map value="keywords" />
      </mapping>
    </element>
    <element id="StructureDefinition.fhirVersion">
      <path value="StructureDefinition.fhirVersion" />
      <short value="FHIR Version this StructureDefinition targets" />
      <definition value="The version of the FHIR specification on which this StructureDefinition is based - this is the formal version of the specification, without the revision number, e.g. [publication].[major].[minor], which is 3.0.2 for this version." />
      <comment value="A StructureDefinition does not need to specify the target it applies to,as StructureDefinitions will often be valid across multiple versions of FHIR. FHIR tooling can determine whether a StructureDefinition is consistent with a particular StructureDefinition if desired." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="id" />
      </type>
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.mapping">
      <path value="StructureDefinition.mapping" />
      <short value="External specification that the content is mapped to" />
      <definition value="An external specification that the content is mapped to." />
      <min value="0" />
      <max value="*" />
      <type>
        <code value="BackboneElement" />
      </type>
      <constraint>
        <key value="ele-1" />
        <severity value="error" />
        <human value="All FHIR elements must have a @value or children" />
        <expression value="hasValue() | (children().count() &gt; id.count())" />
        <xpath value="@value|f:*|h:div" />
        <source value="Element" />
      </constraint>
      <constraint>
        <key value="sdf-2" />
        <severity value="error" />
        <human value="Must have at least a name or a uri (or both)" />
        <expression value="name.exists() or uri.exists()" />
        <xpath value="exists(f:uri) or exists(f:name)" />
      </constraint>
    </element>
    <element id="StructureDefinition.mapping.id">
      <path value="StructureDefinition.mapping.id" />
      <representation value="xmlAttr" />
      <short value="xml:id (or equivalent in JSON)" />
      <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces." />
      <min value="0" />
      <max value="1" />
      <base>
        <path value="Element.id" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="string" />
      </type>
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
    </element>
    <element id="StructureDefinition.mapping.extension">
      <path value="StructureDefinition.mapping.extension" />
      <short value="Additional Content defined by implementations" />
      <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension." />
      <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone." />
      <alias value="extensions" />
      <alias value="user content" />
      <min value="0" />
      <max value="*" />
      <base>
        <path value="Element.extension" />
        <min value="0" />
        <max value="*" />
      </base>
      <type>
        <code value="Extension" />
      </type>
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
    </element>
    <element id="StructureDefinition.mapping.modifierExtension">
      <path value="StructureDefinition.mapping.modifierExtension" />
      <short value="Extensions that cannot be ignored" />
      <definition value="May be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions." />
      <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone." />
      <alias value="extensions" />
      <alias value="user content" />
      <alias value="modifiers" />
      <min value="0" />
      <max value="*" />
      <base>
        <path value="BackboneElement.modifierExtension" />
        <min value="0" />
        <max value="*" />
      </base>
      <type>
        <code value="Extension" />
      </type>
      <isModifier value="true" />
      <isSummary value="true" />
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
    <element id="StructureDefinition.mapping.identity">
      <path value="StructureDefinition.mapping.identity" />
      <short value="Internal id when this mapping is used" />
      <definition value="An Internal id that is used to identify this mapping set when specific mappings are made." />
      <comment value="The specification is described once, with general comments, and then specific mappings are made that reference this declaration." />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="id" />
      </type>
    </element>
    <element id="StructureDefinition.mapping.uri">
      <path value="StructureDefinition.mapping.uri" />
      <short value="Identifies what this mapping refers to" />
      <definition value="An absolute URI that identifies the specification that this mapping is expressed to." />
      <comment value="A formal identity for the specification being mapped to helps with identifying maps consistently." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="uri" />
      </type>
      <condition value="sdf-2" />
    </element>
    <element id="StructureDefinition.mapping.name">
      <path value="StructureDefinition.mapping.name" />
      <short value="Names what this mapping refers to" />
      <definition value="A name for the specification that is being mapped to." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="string" />
      </type>
      <condition value="sdf-2" />
    </element>
    <element id="StructureDefinition.mapping.comment">
      <path value="StructureDefinition.mapping.comment" />
      <short value="Versions, Issues, Scope limitations etc." />
      <definition value="Comments about this mapping, including version notes, issues, scope limitations, and other important notes for usage." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="string" />
      </type>
    </element>
    <element id="StructureDefinition.kind">
      <path value="StructureDefinition.kind" />
      <short value="primitive-type | complex-type | resource | logical" />
      <definition value="Defines the kind of structure that this definition is describing." />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="code" />
      </type>
      <isSummary value="true" />
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="StructureDefinitionKind" />
        </extension>
        <strength value="required" />
        <description value="Defines the type of structure that a definition is describing." />
        <valueSetReference>
          <reference value="http://hl7.org/fhir/ValueSet/structure-definition-kind" />
        </valueSetReference>
      </binding>
    </element>
    <element id="StructureDefinition.abstract">
      <path value="StructureDefinition.abstract" />
      <short value="Whether the structure is abstract" />
      <definition value="Whether structure this definition describes is abstract or not  - that is, whether the structure is not intended to be instantiated. For Resources and Data types, abstract types will never be exchanged  between systems." />
      <comment value="Abstract Resources cannot be instantiated - a concrete sub-type must be used. Abstract datatypes and extensions cannot be used in an instance. For logical models, the exact implication of &quot;abstract&quot; will rest with the author, depending how the logical model is used. Flagging a constraint structure as abstract conveys design intent but makes no difference to how the structure definition is handled. Note that inline declared elements that are given the type &quot;Element&quot; in the profile, but have children described, are anonymous concrete types that specialise Element." />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="boolean" />
      </type>
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.contextType">
      <path value="StructureDefinition.contextType" />
      <short value="resource | datatype | extension" />
      <definition value="If this is an extension, Identifies the context within FHIR resources where the extension can be used." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="code" />
      </type>
      <condition value="sdf-5" />
      <isSummary value="true" />
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="ExtensionContext" />
        </extension>
        <strength value="required" />
        <description value="How an extension context is interpreted." />
        <valueSetReference>
          <reference value="http://hl7.org/fhir/ValueSet/extension-context" />
        </valueSetReference>
      </binding>
    </element>
    <element id="StructureDefinition.context">
      <path value="StructureDefinition.context" />
      <short value="Where the extension can be used in instances" />
      <definition value="Identifies the types of resource or data type elements to which the extension can be applied." />
      <comment value="If the context is an element that can have multiple types, then use (e.g.) value[x] if the extension works on all choice types, or otherwise an enumeration of explicitly named elements if not. Note that a context of &quot;string&quot; doesn't mean that the extension can be used with one of the string patterns such as &quot;id&quot; etc." />
      <min value="0" />
      <max value="*" />
      <type>
        <code value="string" />
      </type>
      <condition value="sdf-5" />
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.contextInvariant">
      <path value="StructureDefinition.contextInvariant" />
      <short value="FHIRPath invariants - when the extension can be used" />
      <definition value="A set of rules as Fluent Invariants about when the extension can be used (e.g. co-occurrence variants for the extension)." />
      <comment value="All the rules must be true. When evaluating the invariant, the fluentpath focus is the element that holds the extension, and %extension refers to the extension itself." />
      <min value="0" />
      <max value="*" />
      <type>
        <code value="string" />
      </type>
      <condition value="sdf-18" />
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.type">
      <path value="StructureDefinition.type" />
      <short value="Type defined or constrained by this structure" />
      <definition value="The type this structure describes. If the derivation kind is 'specialization' then this is the master definition for a type, and there is always one of these (a data type, an extension, a resource, including abstract ones). Otherwise the structure definition is a constraint on the stated type (and in this case, the type cannot be an abstract type)." />
      <comment value="Note that in the case of constraints, the type could be determined by chasing through the baseDefinition references until a concrete structure (derivation = specialization) is reached, or by looking at the path of the first element in the snapshot - if present - but providing the type directly makes for simpler tooling and indexing." />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="code" />
      </type>
      <condition value="sdf-4" />
      <condition value="sdf-11" />
      <isSummary value="true" />
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="FHIRDefinedTypeExt" />
        </extension>
        <strength value="extensible" />
        <description value="Either a resource or a data type, including logical model types" />
        <valueSetReference>
          <reference value="http://hl7.org/fhir/ValueSet/defined-types" />
        </valueSetReference>
      </binding>
    </element>
    <element id="StructureDefinition.baseDefinition">
      <path value="StructureDefinition.baseDefinition" />
      <short value="Definition that this type is constrained/specialized from" />
      <definition value="An absolute URI that is the base structure from which this type is derived, either by specialization or constraint." />
      <comment value="If differential constraints are specified in this structure, they are applied to the base in a &quot;differential&quot; fashion. If there is no base, then the differential constraints cannot be provided (snapshot only). Differential structures are useful for the editing perspective, and snapshot structures are suitable for operational use. The FHIR Project provides a number of tools/services to populate snapshots from differential constraints. Logical Models have a base of &quot;Element&quot; or another logical model." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="uri" />
      </type>
      <condition value="sdf-4" />
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.derivation">
      <path value="StructureDefinition.derivation" />
      <short value="specialization | constraint - How relates to base definition" />
      <definition value="How the type relates to the baseDefinition." />
      <comment value="If the definition is a specialization, then it adds new elements in the differential, and the snapshot includes the inherited elements.&#xA;&#xA;If the definition is a constraint, then it can not define new elements, it can only make new rules about existing content (see [Profiling Resources](profiling.html#resources))." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="code" />
      </type>
      <isSummary value="true" />
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="TypeDerivationRule" />
        </extension>
        <strength value="required" />
        <description value="How a type relates to its baseDefinition." />
        <valueSetReference>
          <reference value="http://hl7.org/fhir/ValueSet/type-derivation-rule" />
        </valueSetReference>
      </binding>
    </element>
    <element id="StructureDefinition.snapshot">
      <path value="StructureDefinition.snapshot" />
      <short value="Snapshot view of the structure" />
      <definition value="A snapshot view is expressed in a stand alone form that can be used and interpreted without considering the base StructureDefinition." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="BackboneElement" />
      </type>
      <condition value="sdf-6" />
      <constraint>
        <key value="ele-1" />
        <severity value="error" />
        <human value="All FHIR elements must have a @value or children" />
        <expression value="hasValue() | (children().count() &gt; id.count())" />
        <xpath value="@value|f:*|h:div" />
        <source value="Element" />
      </constraint>
      <constraint>
        <key value="sdf-15" />
        <requirements value="No Type on the root element (snapshot)" />
        <severity value="error" />
        <human value="The first element in a snapshot has no type" />
        <expression value="kind!='logical' implies snapshot.element.first().type.empty()" />
        <xpath value="not(f:element[1]/f:type)" />
      </constraint>
      <constraint>
        <key value="sdf-8" />
        <severity value="error" />
        <human value="In any snapshot, all the elements must be in the specified type" />
        <expression value="(%resource.kind = #39;.logical#39;. or element.first().path = %resource.type) and element.tail().all(path.startsWith(%resource.snapshot.element.first().path&amp;'.'))" />
        <xpath value="f:element[1]/f:path/@value=parent::f:StructureDefinition/f:type/@value and count(f:element[position()!=1])=count(f:element[position()!=1][starts-with(f:path/@value, concat(ancestor::f:StructureDefinition/f:type/@value, '.'))])" />
      </constraint>
      <constraint>
        <key value="sdf-3" />
        <severity value="error" />
        <human value="Each element definition in a snapshot must have a formal definition and cardinalities" />
        <expression value="element.all(definition and min and max)" />
        <xpath value="count(f:element) = count(f:element[exists(f:definition) and exists(f:min) and exists(f:max)])" />
      </constraint>
    </element>
    <element id="StructureDefinition.snapshot.id">
      <path value="StructureDefinition.snapshot.id" />
      <representation value="xmlAttr" />
      <short value="xml:id (or equivalent in JSON)" />
      <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces." />
      <min value="0" />
      <max value="1" />
      <base>
        <path value="Element.id" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="string" />
      </type>
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
    </element>
    <element id="StructureDefinition.snapshot.extension">
      <path value="StructureDefinition.snapshot.extension" />
      <short value="Additional Content defined by implementations" />
      <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension." />
      <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone." />
      <alias value="extensions" />
      <alias value="user content" />
      <min value="0" />
      <max value="*" />
      <base>
        <path value="Element.extension" />
        <min value="0" />
        <max value="*" />
      </base>
      <type>
        <code value="Extension" />
      </type>
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
    </element>
    <element id="StructureDefinition.snapshot.modifierExtension">
      <path value="StructureDefinition.snapshot.modifierExtension" />
      <short value="Extensions that cannot be ignored" />
      <definition value="May be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions." />
      <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone." />
      <alias value="extensions" />
      <alias value="user content" />
      <alias value="modifiers" />
      <min value="0" />
      <max value="*" />
      <base>
        <path value="BackboneElement.modifierExtension" />
        <min value="0" />
        <max value="*" />
      </base>
      <type>
        <code value="Extension" />
      </type>
      <isModifier value="true" />
      <isSummary value="true" />
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
    <element id="StructureDefinition.snapshot.element">
      <path value="StructureDefinition.snapshot.element" />
      <short value="Definition of elements in the resource (if no StructureDefinition)" />
      <definition value="Captures constraints on each element within the resource." />
      <min value="1" />
      <max value="*" />
      <type>
        <code value="ElementDefinition" />
      </type>
      <condition value="sdf-3" />
      <mapping>
        <identity value="iso11179" />
        <map value="--" />
      </mapping>
    </element>
    <element id="StructureDefinition.differential">
      <path value="StructureDefinition.differential" />
      <short value="Differential view of the structure" />
      <definition value="A differential view is expressed relative to the base StructureDefinition - a statement of differences that it applies." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="BackboneElement" />
      </type>
      <condition value="sdf-6" />
      <constraint>
        <key value="ele-1" />
        <severity value="error" />
        <human value="All FHIR elements must have a @value or children" />
        <expression value="hasValue() | (children().count() &gt; id.count())" />
        <xpath value="@value|f:*|h:div" />
        <source value="Element" />
      </constraint>
      <constraint>
        <key value="sdf-15a" />
        <requirements value="No Type on the root element (differential)" />
        <severity value="error" />
        <human value="If the first element in a differential has no &quot;.&quot; in the path, it has no type" />
        <expression value="element.first().path.contains('.').not() implies element.first().type.empty()" />
        <xpath value="not(f:element[1][not(contains(f:path/@value, '.'))]/f:type)" />
      </constraint>
      <constraint>
        <key value="sdf-20" />
        <requirements value="no slicing on root" />
        <severity value="error" />
        <human value="No slicing on the root element" />
        <expression value="element.where(path.contains('.').not()).slicing.empty()" />
        <xpath value="not(f:element[1]/f:slicing)" />
      </constraint>
      <constraint>
        <key value="sdf-8a" />
        <severity value="error" />
        <human value="In any differential, all the elements must be in the specified type" />
        <expression value="element.first().path.startsWith(%resource.type) and element.tail().all(path.startsWith(%resource.type&amp;'.'))" />
        <xpath value="count(f:element)=count(f:element[f:path/@value=ancestor::f:StructureDefinition/f:type/@value or starts-with(f:path/@value, concat(ancestor::f:StructureDefinition/f:type/@value, '.'))])" />
      </constraint>
    </element>
    <element id="StructureDefinition.differential.id">
      <path value="StructureDefinition.differential.id" />
      <representation value="xmlAttr" />
      <short value="xml:id (or equivalent in JSON)" />
      <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces." />
      <min value="0" />
      <max value="1" />
      <base>
        <path value="Element.id" />
        <min value="0" />
        <max value="1" />
      </base>
      <type>
        <code value="string" />
      </type>
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
    </element>
    <element id="StructureDefinition.differential.extension">
      <path value="StructureDefinition.differential.extension" />
      <short value="Additional Content defined by implementations" />
      <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension." />
      <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone." />
      <alias value="extensions" />
      <alias value="user content" />
      <min value="0" />
      <max value="*" />
      <base>
        <path value="Element.extension" />
        <min value="0" />
        <max value="*" />
      </base>
      <type>
        <code value="Extension" />
      </type>
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
    </element>
    <element id="StructureDefinition.differential.modifierExtension">
      <path value="StructureDefinition.differential.modifierExtension" />
      <short value="Extensions that cannot be ignored" />
      <definition value="May be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions." />
      <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone." />
      <alias value="extensions" />
      <alias value="user content" />
      <alias value="modifiers" />
      <min value="0" />
      <max value="*" />
      <base>
        <path value="BackboneElement.modifierExtension" />
        <min value="0" />
        <max value="*" />
      </base>
      <type>
        <code value="Extension" />
      </type>
      <isModifier value="true" />
      <isSummary value="true" />
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
    <element id="StructureDefinition.differential.element">
      <path value="StructureDefinition.differential.element" />
      <short value="Definition of elements in the resource (if no StructureDefinition)" />
      <definition value="Captures constraints on each element within the resource." />
      <min value="1" />
      <max value="*" />
      <type>
        <code value="ElementDefinition" />
      </type>
      <mapping>
        <identity value="iso11179" />
        <map value="--" />
      </mapping>
    </element>
  </snapshot>
  <differential>
    <element id="StructureDefinition">
      <path value="StructureDefinition" />
      <short value="Structural Definition" />
      <definition value="A definition of a FHIR structure. This resource is used to describe the underlying resources, data types defined in FHIR, and also for describing extensions and constraints on resources and data types." />
      <alias value="Template" />
      <alias value="Profile" />
      <min value="0" />
      <max value="*" />
      <constraint>
        <key value="sdf-9" />
        <requirements value="Because these 3 fields seem to be have overlapping meaning with the ones in the root of StructureDefinition" />
        <severity value="error" />
        <human value="In any snapshot or differential, no label, code or requirements on the an element without a &quot;.&quot; in the path (e.g. the first element)" />
        <expression value="children().element.where(path.contains('.').not()).label.empty() and children().element.where(path.contains('.').not()).code.empty() and children().element.where(path.contains('.').not()).requirements.empty()" />
        <xpath value="not(exists(f:snapshot/f:element[not(contains(f:path/@value, '.')) and (f:label or f:code or f:requirements)])) and not(exists(f:differential/f:element[not(contains(f:path/@value, '.')) and (f:label or f:code or f:requirements)]))" />
      </constraint>
      <constraint>
        <key value="sdf-19" />
        <requirements value="custom types only in logical models" />
        <severity value="error" />
        <human value="Custom types can only be used in logical models" />
        <expression value="kind = 'logical' or (differential.element.type.code.all(hasValue() implies matches('^[a-zA-Z0-9]+$')) and snapshot.element.type.code.all(hasValue() implies matches('^[a-zA-Z0-9]+$')))" />
        <xpath value="f:kind/@value = 'logical' or count(f:differential/f:element/f:type/f:code[@value and not(matches(string(@value), '^[a-zA-Z0-9]+$'))]|f:snapshot/f:element/f:type/f:code[@value and not(matches(string(@value), '^[a-zA-Z0-9]+$'))]) =0" />
      </constraint>
      <constraint>
        <key value="sdf-16" />
        <requirements value="element ids need to be unique" />
        <severity value="error" />
        <human value="All element definitions must have unique ids (snapshot)" />
        <expression value="snapshot.element.id.trace('ids').isDistinct()" />
        <xpath value="count(*/f:element)=count(*/f:element/@id)" />
      </constraint>
      <constraint>
        <key value="sdf-18" />
        <requirements value="contextInvariant" />
        <severity value="error" />
        <human value="Context Invariants can only be used for extensions" />
        <expression value="contextInvariant.exists() implies type = 'Extension'" />
        <xpath value="not(exists(f:contextInvariant)) or (f:type/@value = 'Extension')" />
      </constraint>
      <constraint>
        <key value="sdf-17" />
        <requirements value="element ids need to be unique" />
        <severity value="error" />
        <human value="All element definitions must have unique ids (diff)" />
        <expression value="differential.element.id.trace('ids').isDistinct()" />
        <xpath value="count(*/f:element)=count(*/f:element/@id)" />
      </constraint>
      <constraint>
        <key value="sdf-11" />
        <requirements value="Ensure that the type is not inconsistent with the other information in the structure" />
        <severity value="error" />
        <human value="If there's a type, its content must match the path name in the first element of a snapshot" />
        <expression value="snapshot.empty() or snapshot.element.first().path = type" />
        <xpath value="not(exists(f:snapshot)) or (f:type/@value = f:snapshot/f:element[1]/f:path/@value)" />
      </constraint>
      <constraint>
        <key value="sdf-14" />
        <requirements value="elements have id" />
        <severity value="error" />
        <human value="All element definitions must have an id" />
        <expression value="snapshot.element.all(id.exists()) and differential.element.all(id.exists())" />
        <xpath value="count(*/f:element)=count(*/f:element/@id)" />
      </constraint>
      <constraint>
        <key value="sdf-1" />
        <severity value="error" />
        <human value="Element paths must be unique unless the structure is a constraint" />
        <expression value="derivation = 'constraint' or snapshot.element.select(path).isDistinct()" />
        <xpath value="(f:derivation/@value = 'constraint') or (count(f:snapshot/f:element) = count(distinct-values(f:snapshot/f:element/f:path/@value)))" />
      </constraint>
      <constraint>
        <key value="sdf-7" />
        <severity value="error" />
        <human value="If the structure describes a base Resource or Type, the URL has to start with &quot;http://hl7.org/fhir/StructureDefinition/&quot; and the tail must match the id" />
        <expression value="(derivation = 'constraint') or (kind = 'logical') or (url = 'http://hl7.org/fhir/StructureDefinition/'+id)" />
        <xpath value="(f:derivation/@value = 'constraint') or (f:kind/@value = 'logical') or (f:url/@value=concat('http://hl7.org/fhir/StructureDefinition/', f:id/@value))" />
      </constraint>
      <constraint>
        <key value="sdf-6" />
        <severity value="error" />
        <human value="A structure must have either a differential, or a snapshot (or both)" />
        <expression value="snapshot.exists() or differential.exists()" />
        <xpath value="exists(f:snapshot) or exists(f:differential)" />
      </constraint>
      <constraint>
        <key value="sdf-5" />
        <severity value="error" />
        <human value="If the structure defines an extension then the structure must have context information" />
        <expression value="type != 'Extension' or derivation = 'specialization' or (context.exists() and contextType.exists())" />
        <xpath value="not(f:type/@value = 'extension') or (f:derivation/@value = 'specialization') or (exists(f:context) and exists(f:contextType))" />
      </constraint>
      <constraint>
        <key value="sdf-4" />
        <requirements value="Ensure that the base types are abstract" />
        <severity value="error" />
        <human value="If the structure is not abstract, then there SHALL be a baseDefinition" />
        <expression value="abstract = true or baseDefinition.exists()" />
        <xpath value="(f:abstract/@value=true()) or exists(f:baseDefinition)" />
      </constraint>
      <mapping>
        <identity value="rim" />
        <map value="n/a" />
      </mapping>
      <mapping>
        <identity value="w5" />
        <map value="conformance.content" />
      </mapping>
    </element>
    <element id="StructureDefinition.url">
      <path value="StructureDefinition.url" />
      <short value="Logical URI to reference this structure definition (globally unique)" />
      <definition value="An absolute URI that is used to identify this structure definition when it is referenced in a specification, model, design or an instance. This SHALL be a URL, SHOULD be globally unique, and SHOULD be an address at which this structure definition is (or will be) published. The URL SHOULD include the major version of the structure definition. For more information see [Technical and Business Versions](resource.html#versions)." />
      <comment value="Can be a urn:uuid: or a urn:oid:, but real http: addresses are preferred.  Multiple instances may share the same url if they have a distinct version." />
      <requirements value="Allows the structure definition to be referenced by a single globally unique identifier." />
      <alias value="url" />
      <alias value="authoritative-url" />
      <alias value="destination" />
      <alias value="identity" />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="uri" />
      </type>
      <isSummary value="true" />
      <mapping>
        <identity value="w5" />
        <map value="id" />
      </mapping>
    </element>
    <element id="StructureDefinition.identifier">
      <path value="StructureDefinition.identifier" />
      <short value="Additional identifier for the structure definition" />
      <definition value="A formal identifier that is used to identify this structure definition when it is represented in other formats, or referenced in a specification, model, design or an instance." />
      <comment value="Typically, this is used for identifiers that can go in an HL7 V3 II (instance identifier) data type, e.g., to identify this structure definition outside of FHIR, where it is not possible to use the logical URI." />
      <requirements value="Allows externally provided and/or usable business identifiers to be easily associated with the module." />
      <min value="0" />
      <max value="*" />
      <type>
        <code value="Identifier" />
      </type>
      <isSummary value="true" />
      <mapping>
        <identity value="iso11179" />
        <map value="Identifier part" />
      </mapping>
      <mapping>
        <identity value="objimpl" />
        <map value="no-gen-base" />
      </mapping>
      <mapping>
        <identity value="w5" />
        <map value="id" />
      </mapping>
    </element>
    <element id="StructureDefinition.version">
      <path value="StructureDefinition.version" />
      <short value="Business version of the structure definition" />
      <definition value="The identifier that is used to identify this version of the structure definition when it is referenced in a specification, model, design or instance. This is an arbitrary value managed by the structure definition 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." />
      <comment value="There may be different structure definition instances that have the same identifier but different versions.  The version can be appended to the url in a reference to allow a refrence to a particular business version of the structure definition with the format [url]|[version]." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="string" />
      </type>
      <isSummary value="true" />
      <mapping>
        <identity value="iso11179" />
        <map value="Version" />
      </mapping>
      <mapping>
        <identity value="w5" />
        <map value="id.version" />
      </mapping>
    </element>
    <element id="StructureDefinition.name">
      <path value="StructureDefinition.name" />
      <short value="Name for this structure definition (computer friendly)" />
      <definition value="A natural language name identifying the structure definition. This name should be usable as an identifier for the module by machine processing applications such as code generation." />
      <comment value="The name is not expected to be globally unique. The name should be a simple alpha-numeric type name to ensure that it is computable friendly." />
      <requirements value="Support human navigation and code generation." />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="string" />
      </type>
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.title">
      <path value="StructureDefinition.title" />
      <short value="Name for this structure definition (human friendly)" />
      <definition value="A short, descriptive, user-friendly title for the structure definition." />
      <comment value="This name does not need to be machine-processing friendly and may contain punctuation, white-space, etc. Applications don't have to use this name, but can always fall back to it. The title also corresponds to the label for the root element." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="string" />
      </type>
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.status">
      <path value="StructureDefinition.status" />
      <short value="draft | active | retired | unknown" />
      <definition value="The status of this structure definition. Enables tracking the life-cycle of the content." />
      <comment value="Allows filtering of structure definitions that are appropriate for use vs. not.  &#xA;This is labeled as &quot;Is Modifier&quot; because applications should not use a retired structure definition without due consideration." />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="code" />
      </type>
      <isModifier value="true" />
      <isSummary value="true" />
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="PublicationStatus" />
        </extension>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-isCommonBinding">
          <valueBoolean value="true" />
        </extension>
        <strength value="required" />
        <description value="The lifecycle status of a Value Set or Concept Map." />
        <valueSetReference>
          <reference value="http://hl7.org/fhir/ValueSet/publication-status" />
        </valueSetReference>
      </binding>
      <mapping>
        <identity value="iso11179" />
        <map value="Registration status" />
      </mapping>
      <mapping>
        <identity value="w5" />
        <map value="status" />
      </mapping>
    </element>
    <element id="StructureDefinition.experimental">
      <path value="StructureDefinition.experimental" />
      <short value="For testing purposes, not real usage" />
      <definition value="A boolean value to indicate that this structure definition is authored for testing purposes (or education/evaluation/marketing), and is not intended to be used for genuine usage." />
      <comment value="Allows filtering of structure definition that are appropriate for use vs. not. This is labeled as &quot;Is Modifier&quot; because applications should not use an experimental structure definition in production." />
      <requirements value="Enables experimental content to be developed following the same lifecycle that would be used for a production-level structure definition." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="boolean" />
      </type>
      <isModifier value="true" />
      <isSummary value="true" />
      <mapping>
        <identity value="iso11179" />
        <map value="Registration status" />
      </mapping>
      <mapping>
        <identity value="w5" />
        <map value="class" />
      </mapping>
    </element>
    <element id="StructureDefinition.date">
      <path value="StructureDefinition.date" />
      <short value="Date this was last changed" />
      <definition value="The date  (and optionally time) when the structure definition was published. The date must change if and 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 structure definition changes." />
      <comment value="Note that this is not the same as the resource last-modified-date, since the resource may be a secondary representation of the structure definition. Additional specific dates may be added as extensions or be found by consulting Provenances associated with past versions of the resource." />
      <alias value="Revision Date" />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="dateTime" />
      </type>
      <isSummary value="true" />
      <mapping>
        <identity value="w5" />
        <map value="when.recorded" />
      </mapping>
    </element>
    <element id="StructureDefinition.publisher">
      <path value="StructureDefinition.publisher" />
      <short value="Name of the publisher (organization or individual)" />
      <definition value="The name of the individual or organization that published the structure definition." />
      <comment value="Usually an organization, but may be an individual. The publisher (or steward) of the structure definition is the organization or individual primarily responsible for the maintenance and upkeep of the structure definition. This is not necessarily the same individual or organization that developed and initially authored the content. The publisher is the primary point of contact for questions or issues with the structure definition. This item SHOULD be populated unless the information is available from context." />
      <requirements value="Helps establish the &quot;authority/credibility&quot; of the structure definition.  May also allow for contact." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="string" />
      </type>
      <isSummary value="true" />
      <mapping>
        <identity value="iso11179" />
        <map value="Registration Authority" />
      </mapping>
      <mapping>
        <identity value="w5" />
        <map value="who.witness" />
      </mapping>
    </element>
    <element id="StructureDefinition.contact">
      <path value="StructureDefinition.contact" />
      <short value="Contact details for the publisher" />
      <definition value="Contact details to assist a user in finding and communicating with the publisher." />
      <comment value="May be a web site, an email address, a telephone number, etc." />
      <min value="0" />
      <max value="*" />
      <type>
        <code value="ContactDetail" />
      </type>
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.description">
      <path value="StructureDefinition.description" />
      <short value="Natural language description of the structure definition" />
      <definition value="A free text natural language description of the structure definition from a consumer's perspective." />
      <comment value="This description can be used to capture details such as why the structure definition was built, comments about misuse, instructions for clinical use and interpretation, literature references, examples from the paper world, etc. It is not a rendering of the structure definition as conveyed in the 'text' field of the resource itself. This item SHOULD be populated unless the information is available from context (e.g. the language of the profile is presumed to be the predominant language in the place the profile was created)." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="markdown" />
      </type>
    </element>
    <element id="StructureDefinition.useContext">
      <path value="StructureDefinition.useContext" />
      <short value="Context the content is intended to support" />
      <definition value="The content was developed with a focus and intent of supporting the contexts that are listed. These terms may be used to assist with indexing and searching for appropriate structure definition instances." />
      <comment value="When multiple useContexts are specified, there is no expectation whether all or any of the contexts apply." />
      <requirements value="Assist in searching for appropriate content." />
      <min value="0" />
      <max value="*" />
      <type>
        <code value="UsageContext" />
      </type>
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.jurisdiction">
      <path value="StructureDefinition.jurisdiction" />
      <short value="Intended jurisdiction for structure definition (if applicable)" />
      <definition value="A legal or geographic region in which the structure definition is intended to be used." />
      <comment value="It may be possible for the structure definition to be used in jurisdictions other than those for which it was originally designed or intended." />
      <min value="0" />
      <max value="*" />
      <type>
        <code value="CodeableConcept" />
      </type>
      <isSummary value="true" />
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="Jurisdiction" />
        </extension>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-isCommonBinding">
          <valueBoolean value="true" />
        </extension>
        <strength value="extensible" />
        <description value="Countries and regions within which this artifact is targeted for use" />
        <valueSetReference>
          <reference value="http://hl7.org/fhir/ValueSet/jurisdiction" />
        </valueSetReference>
      </binding>
    </element>
    <element id="StructureDefinition.purpose">
      <path value="StructureDefinition.purpose" />
      <short value="Why this structure definition is defined" />
      <definition value="Explaination of why this structure definition is needed and why it has been designed as it has." />
      <comment value="This element does not describe the usage of the structure definition Instead  it provides traceability of ''why'' the resource is either needed or ''why'' it is defined as it is.  This may be used to point to source materials or specifications that drove the structure of this structure definition." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="markdown" />
      </type>
      <mapping>
        <identity value="objimpl" />
        <map value="no-gen-base" />
      </mapping>
      <mapping>
        <identity value="w5" />
        <map value="why" />
      </mapping>
    </element>
    <element id="StructureDefinition.copyright">
      <path value="StructureDefinition.copyright" />
      <short value="Use and/or publishing restrictions" />
      <definition value="A copyright statement relating to the structure definition and/or its contents. Copyright statements are generally legal restrictions on the use and publishing of the structure definition." />
      <requirements value="Consumers must be able to determine any legal restrictions on the use of the structure definition and/or its content." />
      <alias value="License" />
      <alias value="Restrictions" />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="markdown" />
      </type>
      <mapping>
        <identity value="objimpl" />
        <map value="no-gen-base" />
      </mapping>
    </element>
    <element id="StructureDefinition.keyword">
      <path value="StructureDefinition.keyword" />
      <short value="Assist with indexing and finding" />
      <definition value="A set of key words or terms from external terminologies that may be used to assist with indexing and searching of templates." />
      <requirements value="Assist in searching for appropriate StructureDefinitions." />
      <min value="0" />
      <max value="*" />
      <type>
        <code value="Coding" />
      </type>
      <isSummary value="true" />
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="StructureDefinitionCode" />
        </extension>
        <strength value="example" />
        <description value="Codes for the meaning of the defined structure (SNOMED CT and LOINC codes, as an example)." />
        <valueSetReference>
          <reference value="http://hl7.org/fhir/ValueSet/profile-code" />
        </valueSetReference>
      </binding>
      <mapping>
        <identity value="iso11179" />
        <map value="keywords" />
      </mapping>
    </element>
    <element id="StructureDefinition.fhirVersion">
      <path value="StructureDefinition.fhirVersion" />
      <short value="FHIR Version this StructureDefinition targets" />
      <definition value="The version of the FHIR specification on which this StructureDefinition is based - this is the formal version of the specification, without the revision number, e.g. [publication].[major].[minor], which is 3.0.2 for this version." />
      <comment value="A StructureDefinition does not need to specify the target it applies to,as StructureDefinitions will often be valid across multiple versions of FHIR. FHIR tooling can determine whether a StructureDefinition is consistent with a particular StructureDefinition if desired." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="id" />
      </type>
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.mapping">
      <path value="StructureDefinition.mapping" />
      <short value="External specification that the content is mapped to" />
      <definition value="An external specification that the content is mapped to." />
      <min value="0" />
      <max value="*" />
      <type>
        <code value="BackboneElement" />
      </type>
      <constraint>
        <key value="sdf-2" />
        <severity value="error" />
        <human value="Must have at least a name or a uri (or both)" />
        <expression value="name.exists() or uri.exists()" />
        <xpath value="exists(f:uri) or exists(f:name)" />
      </constraint>
    </element>
    <element id="StructureDefinition.mapping.identity">
      <path value="StructureDefinition.mapping.identity" />
      <short value="Internal id when this mapping is used" />
      <definition value="An Internal id that is used to identify this mapping set when specific mappings are made." />
      <comment value="The specification is described once, with general comments, and then specific mappings are made that reference this declaration." />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="id" />
      </type>
    </element>
    <element id="StructureDefinition.mapping.uri">
      <path value="StructureDefinition.mapping.uri" />
      <short value="Identifies what this mapping refers to" />
      <definition value="An absolute URI that identifies the specification that this mapping is expressed to." />
      <comment value="A formal identity for the specification being mapped to helps with identifying maps consistently." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="uri" />
      </type>
      <condition value="sdf-2" />
    </element>
    <element id="StructureDefinition.mapping.name">
      <path value="StructureDefinition.mapping.name" />
      <short value="Names what this mapping refers to" />
      <definition value="A name for the specification that is being mapped to." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="string" />
      </type>
      <condition value="sdf-2" />
    </element>
    <element id="StructureDefinition.mapping.comment">
      <path value="StructureDefinition.mapping.comment" />
      <short value="Versions, Issues, Scope limitations etc." />
      <definition value="Comments about this mapping, including version notes, issues, scope limitations, and other important notes for usage." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="string" />
      </type>
    </element>
    <element id="StructureDefinition.kind">
      <path value="StructureDefinition.kind" />
      <short value="primitive-type | complex-type | resource | logical" />
      <definition value="Defines the kind of structure that this definition is describing." />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="code" />
      </type>
      <isSummary value="true" />
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="StructureDefinitionKind" />
        </extension>
        <strength value="required" />
        <description value="Defines the type of structure that a definition is describing." />
        <valueSetReference>
          <reference value="http://hl7.org/fhir/ValueSet/structure-definition-kind" />
        </valueSetReference>
      </binding>
    </element>
    <element id="StructureDefinition.abstract">
      <path value="StructureDefinition.abstract" />
      <short value="Whether the structure is abstract" />
      <definition value="Whether structure this definition describes is abstract or not  - that is, whether the structure is not intended to be instantiated. For Resources and Data types, abstract types will never be exchanged  between systems." />
      <comment value="Abstract Resources cannot be instantiated - a concrete sub-type must be used. Abstract datatypes and extensions cannot be used in an instance. For logical models, the exact implication of &quot;abstract&quot; will rest with the author, depending how the logical model is used. Flagging a constraint structure as abstract conveys design intent but makes no difference to how the structure definition is handled. Note that inline declared elements that are given the type &quot;Element&quot; in the profile, but have children described, are anonymous concrete types that specialise Element." />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="boolean" />
      </type>
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.contextType">
      <path value="StructureDefinition.contextType" />
      <short value="resource | datatype | extension" />
      <definition value="If this is an extension, Identifies the context within FHIR resources where the extension can be used." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="code" />
      </type>
      <condition value="sdf-5" />
      <isSummary value="true" />
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="ExtensionContext" />
        </extension>
        <strength value="required" />
        <description value="How an extension context is interpreted." />
        <valueSetReference>
          <reference value="http://hl7.org/fhir/ValueSet/extension-context" />
        </valueSetReference>
      </binding>
    </element>
    <element id="StructureDefinition.context">
      <path value="StructureDefinition.context" />
      <short value="Where the extension can be used in instances" />
      <definition value="Identifies the types of resource or data type elements to which the extension can be applied." />
      <comment value="If the context is an element that can have multiple types, then use (e.g.) value[x] if the extension works on all choice types, or otherwise an enumeration of explicitly named elements if not. Note that a context of &quot;string&quot; doesn't mean that the extension can be used with one of the string patterns such as &quot;id&quot; etc." />
      <min value="0" />
      <max value="*" />
      <type>
        <code value="string" />
      </type>
      <condition value="sdf-5" />
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.contextInvariant">
      <path value="StructureDefinition.contextInvariant" />
      <short value="FHIRPath invariants - when the extension can be used" />
      <definition value="A set of rules as Fluent Invariants about when the extension can be used (e.g. co-occurrence variants for the extension)." />
      <comment value="All the rules must be true. When evaluating the invariant, the fluentpath focus is the element that holds the extension, and %extension refers to the extension itself." />
      <min value="0" />
      <max value="*" />
      <type>
        <code value="string" />
      </type>
      <condition value="sdf-18" />
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.type">
      <path value="StructureDefinition.type" />
      <short value="Type defined or constrained by this structure" />
      <definition value="The type this structure describes. If the derivation kind is 'specialization' then this is the master definition for a type, and there is always one of these (a data type, an extension, a resource, including abstract ones). Otherwise the structure definition is a constraint on the stated type (and in this case, the type cannot be an abstract type)." />
      <comment value="Note that in the case of constraints, the type could be determined by chasing through the baseDefinition references until a concrete structure (derivation = specialization) is reached, or by looking at the path of the first element in the snapshot - if present - but providing the type directly makes for simpler tooling and indexing." />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="code" />
      </type>
      <condition value="sdf-4" />
      <condition value="sdf-11" />
      <isSummary value="true" />
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="FHIRDefinedTypeExt" />
        </extension>
        <strength value="extensible" />
        <description value="Either a resource or a data type, including logical model types" />
        <valueSetReference>
          <reference value="http://hl7.org/fhir/ValueSet/defined-types" />
        </valueSetReference>
      </binding>
    </element>
    <element id="StructureDefinition.baseDefinition">
      <path value="StructureDefinition.baseDefinition" />
      <short value="Definition that this type is constrained/specialized from" />
      <definition value="An absolute URI that is the base structure from which this type is derived, either by specialization or constraint." />
      <comment value="If differential constraints are specified in this structure, they are applied to the base in a &quot;differential&quot; fashion. If there is no base, then the differential constraints cannot be provided (snapshot only). Differential structures are useful for the editing perspective, and snapshot structures are suitable for operational use. The FHIR Project provides a number of tools/services to populate snapshots from differential constraints. Logical Models have a base of &quot;Element&quot; or another logical model." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="uri" />
      </type>
      <condition value="sdf-4" />
      <isSummary value="true" />
    </element>
    <element id="StructureDefinition.derivation">
      <path value="StructureDefinition.derivation" />
      <short value="specialization | constraint - How relates to base definition" />
      <definition value="How the type relates to the baseDefinition." />
      <comment value="If the definition is a specialization, then it adds new elements in the differential, and the snapshot includes the inherited elements.&#xA;&#xA;If the definition is a constraint, then it can not define new elements, it can only make new rules about existing content (see [Profiling Resources](profiling.html#resources))." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="code" />
      </type>
      <isSummary value="true" />
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="TypeDerivationRule" />
        </extension>
        <strength value="required" />
        <description value="How a type relates to its baseDefinition." />
        <valueSetReference>
          <reference value="http://hl7.org/fhir/ValueSet/type-derivation-rule" />
        </valueSetReference>
      </binding>
    </element>
    <element id="StructureDefinition.snapshot">
      <path value="StructureDefinition.snapshot" />
      <short value="Snapshot view of the structure" />
      <definition value="A snapshot view is expressed in a stand alone form that can be used and interpreted without considering the base StructureDefinition." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="BackboneElement" />
      </type>
      <condition value="sdf-6" />
      <constraint>
        <key value="sdf-15" />
        <requirements value="No Type on the root element (snapshot)" />
        <severity value="error" />
        <human value="The first element in a snapshot has no type" />
        <expression value="kind!='logical' implies snapshot.element.first().type.empty()" />
        <xpath value="not(f:element[1]/f:type)" />
      </constraint>
      <constraint>
        <key value="sdf-8" />
        <severity value="error" />
        <human value="In any snapshot, all the elements must be in the specified type" />
        <expression value="(%resource.kind = #39;.logical#39;. or element.first().path = %resource.type) and element.tail().all(path.startsWith(%resource.snapshot.element.first().path&amp;'.'))" />
        <xpath value="f:element[1]/f:path/@value=parent::f:StructureDefinition/f:type/@value and count(f:element[position()!=1])=count(f:element[position()!=1][starts-with(f:path/@value, concat(ancestor::f:StructureDefinition/f:type/@value, '.'))])" />
      </constraint>
      <constraint>
        <key value="sdf-3" />
        <severity value="error" />
        <human value="Each element definition in a snapshot must have a formal definition and cardinalities" />
        <expression value="element.all(definition and min and max)" />
        <xpath value="count(f:element) = count(f:element[exists(f:definition) and exists(f:min) and exists(f:max)])" />
      </constraint>
    </element>
    <element id="StructureDefinition.snapshot.element">
      <path value="StructureDefinition.snapshot.element" />
      <short value="Definition of elements in the resource (if no StructureDefinition)" />
      <definition value="Captures constraints on each element within the resource." />
      <min value="1" />
      <max value="*" />
      <type>
        <code value="ElementDefinition" />
      </type>
      <condition value="sdf-3" />
      <mapping>
        <identity value="iso11179" />
        <map value="--" />
      </mapping>
    </element>
    <element id="StructureDefinition.differential">
      <path value="StructureDefinition.differential" />
      <short value="Differential view of the structure" />
      <definition value="A differential view is expressed relative to the base StructureDefinition - a statement of differences that it applies." />
      <min value="0" />
      <max value="1" />
      <type>
        <code value="BackboneElement" />
      </type>
      <condition value="sdf-6" />
      <constraint>
        <key value="sdf-15a" />
        <requirements value="No Type on the root element (differential)" />
        <severity value="error" />
        <human value="If the first element in a differential has no &quot;.&quot; in the path, it has no type" />
        <expression value="element.first().path.contains('.').not() implies element.first().type.empty()" />
        <xpath value="not(f:element[1][not(contains(f:path/@value, '.'))]/f:type)" />
      </constraint>
      <constraint>
        <key value="sdf-20" />
        <requirements value="no slicing on root" />
        <severity value="error" />
        <human value="No slicing on the root element" />
        <expression value="element.where(path.contains('.').not()).slicing.empty()" />
        <xpath value="not(f:element[1]/f:slicing)" />
      </constraint>
      <constraint>
        <key value="sdf-8a" />
        <severity value="error" />
        <human value="In any differential, all the elements must be in the specified type" />
        <expression value="element.first().path.startsWith(%resource.type) and element.tail().all(path.startsWith(%resource.type&amp;'.'))" />
        <xpath value="count(f:element)=count(f:element[f:path/@value=ancestor::f:StructureDefinition/f:type/@value or starts-with(f:path/@value, concat(ancestor::f:StructureDefinition/f:type/@value, '.'))])" />
      </constraint>
    </element>
    <element id="StructureDefinition.differential.element">
      <path value="StructureDefinition.differential.element" />
      <short value="Definition of elements in the resource (if no StructureDefinition)" />
      <definition value="Captures constraints on each element within the resource." />
      <min value="1" />
      <max value="*" />
      <type>
        <code value="ElementDefinition" />
      </type>
      <mapping>
        <identity value="iso11179" />
        <map value="--" />
      </mapping>
    </element>
  </differential>
</StructureDefinition>

name : StructureDefinition

{

}

<name value="StructureDefinition" />