HL7 FHIR Profile: Occupational Data for Health (ODH), Release 1.0 (Standard for Trial Use)

This page is part of the Occupational Data for Health (ODH) FHIR IG (v1.0.0: STU 1) based on FHIR R4. The current version which supercedes this version is 1.2.0. For a full list of available versions, see the Directory of published versions

RelationToLandmark


<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="obf-datatype-RelationToLandmark-extension"/>
  <text>
    <status value="generated"/>
    <div xmlns="http://www.w3.org/1999/xhtml">
  <p><b>RelationToLandmark Extension</b></p>
  <p>The relationship between a landmark that helps determine a body location and the body location itself. The location relative to a landmark is specified by:
* Specifying the location and type of landmark using a body site code and optional laterality/orientation,
* Specifying the direction from the landmark to the body location, and
* Specifying the distance from the landmark to the body location.

The RelationToLandmark element is part of BodyLocation, a flexible structure that allows the location to be determined by a single code, or a code plus laterality and/or orientation. The body location can also be specified in relation to one or more body landmarks. SNOMED CT is used in all cases.

* Code only: The code should include (precoordinate) laterality and/orientation to the degree necessary to completely specify the body location.
* Code plus laterality and/or orientation: The basic code augmented by codes specifying the body side and/or anatomical orientation.
* Relation to landmark: The location relative to a landmark is specified by:
1. Establishing the location and type of landmark using a body site code and optional laterality/orientation, and
2. Specifying the direction and distance from the landmark to the body location.

Note that BodyLocation is a data type (a reusable structure), not a stand-alone entity. The concept is similar to how a postal address can apply to a person, location, or organization. This contrasts with FHIR's stand-alone BodySite (aka BodyStructure in r4) which 'is not ... intended for describing the type of anatomical location but rather a specific body site on a specific patient' (FHIR 3.5).</p>
</div>
  </text>
  <url
       value="http://hl7.org/fhir/us/odh/StructureDefinition/obf-datatype-RelationToLandmark-extension"/>
  <version value="1.0.0"/>
  <name value="RelationToLandmark"/>
  <title value="Relation To Landmark"/>
  <status value="draft"/>
  <date value="2020-01-04T00:00:00+00:00"/>
  <publisher value="HL7 International Public Health Work Group"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://www.hl7.org/Special/committees/pher/index.cfm"/>
    </telecom>
  </contact>
  <description
               value="The relationship between a landmark that helps determine a body location and the body location itself. The location relative to a landmark is specified by:
* Specifying the location and type of landmark using a body site code and optional laterality/orientation,
* Specifying the direction from the landmark to the body location, and
* Specifying the distance from the landmark to the body location.

The RelationToLandmark element is part of BodyLocation, a flexible structure that allows the location to be determined by a single code, or a code plus laterality and/or orientation. The body location can also be specified in relation to one or more body landmarks. SNOMED CT is used in all cases.

* Code only: The code should include (precoordinate) laterality and/orientation to the degree necessary to completely specify the body location.
* Code plus laterality and/or orientation: The basic code augmented by codes specifying the body side and/or anatomical orientation.
* Relation to landmark: The location relative to a landmark is specified by:
1. Establishing the location and type of landmark using a body site code and optional laterality/orientation, and
2. Specifying the direction and distance from the landmark to the body location.

Note that BodyLocation is a data type (a reusable structure), not a stand-alone entity. The concept is similar to how a postal address can apply to a person, location, or organization. This contrasts with FHIR&#39;s stand-alone BodySite (aka BodyStructure in r4) which &#39;is not ... intended for describing the type of anatomical location but rather a specific body site on a specific patient&#39; (FHIR 3.5)."/>
  <fhirVersion value="4.0.0"/>
  <kind value="complex-type"/>
  <abstract value="false"/>
  <context>
    <type value="element"/>
    <expression value="*"/>
  </context>
  <type value="Extension"/>
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension"/>
  <derivation value="constraint"/>
  <snapshot>
    <element id="Extension">
      <path value="Extension"/>
      <short value="RelationToLandmark"/>
      <definition
                  value="The relationship between a landmark that helps determine a body location and the body location itself. The location relative to a landmark is specified by:
* Specifying the location and type of landmark using a body site code and optional laterality/orientation,
* Specifying the direction from the landmark to the body location, and
* Specifying the distance from the landmark to the body location.

The RelationToLandmark element is part of BodyLocation, a flexible structure that allows the location to be determined by a single code, or a code plus laterality and/or orientation. The body location can also be specified in relation to one or more body landmarks. SNOMED CT is used in all cases.

* Code only: The code should include (precoordinate) laterality and/orientation to the degree necessary to completely specify the body location.
* Code plus laterality and/or orientation: The basic code augmented by codes specifying the body side and/or anatomical orientation.
* Relation to landmark: The location relative to a landmark is specified by:
1. Establishing the location and type of landmark using a body site code and optional laterality/orientation, and
2. Specifying the direction and distance from the landmark to the body location.

Note that BodyLocation is a data type (a reusable structure), not a stand-alone entity. The concept is similar to how a postal address can apply to a person, location, or organization. This contrasts with FHIR&#39;s stand-alone BodySite (aka BodyStructure in r4) which &#39;is not ... intended for describing the type of anatomical location but rather a specific body site on a specific patient&#39; (FHIR 3.5)."/>
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      <condition value="ele-1"/>
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        <key value="ele-1"/>
        <severity value="error"/>
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        <xpath value="@value|f:*|h:div"/>
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        <key value="ext-1"/>
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        <expression value="extension.exists() != value.exists()"/>
        <xpath
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        <identity value="rim"/>
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        <identity value="rim"/>
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    </element>
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      <path value="Extension.extension"/>
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      <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"/>
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    </element>
    <element id="Extension.extension:landmarkType">
      <path value="Extension.extension"/>
      <sliceName value="landmarkType"/>
      <definition
                  value="The type of feature that constitutes the landmark, particularly if the landmark is an acquired body structure or physical object."/>
      <min value="0"/>
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        <path value="Element.extension"/>
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        <identity value="rim"/>
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    </element>
    <element id="Extension.extension:landmarkType.id">
      <path value="Extension.extension.id"/>
      <representation value="xmlAttr"/>
      <short value="Unique id for inter-element referencing"/>
      <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"/>
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      <type>
        <code value="string"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
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        <identity value="rim"/>
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    </element>
    <element id="Extension.extension:landmarkType.extension">
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          <type value="value"/>
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      <definition
                  value="May be used to represent additional information that is not part of the basic definition of the element. 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 can 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"/>
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        <path value="Element.extension"/>
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        <code value="Extension"/>
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        <identity value="rim"/>
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    </element>
    <element id="Extension.extension:landmarkType.url">
      <path value="Extension.extension.url"/>
      <representation value="xmlAttr"/>
      <short value="identifies the meaning of the extension"/>
      <definition
                  value="Source of the definition for the extension code - a logical name or a URL."/>
      <comment
               value="The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.url"/>
        <min value="1"/>
        <max value="1"/>
      </base>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="landmarkType"/>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkType.valueCodeableConcept">
      <path value="Extension.extension.valueCodeableConcept"/>
      <short value="Value of extension"/>
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                  value="Value of extension - must be one of a constrained set of the data types (see [Extensibility](extensibility.html) for a list)."/>
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        <code value="CodeableConcept"/>
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      <isModifier value="false"/>
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      <binding>
        <strength value="extensible"/>
        <valueSet
                  value="http://hl7.org/fhir/us/odh/ValueSet/obf-datatype-LandmarkTypeVS"/>
      </binding>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkLocation">
      <path value="Extension.extension"/>
      <sliceName value="landmarkLocation"/>
      <definition
                  value="The body location of the landmark, specified by a location code and optional laterality and orientation."/>
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    <element id="Extension.extension:landmarkLocation.id">
      <path value="Extension.extension.id"/>
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      <short value="Unique id for inter-element referencing"/>
      <definition
                  value="Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
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        <identity value="rim"/>
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    </element>
    <element id="Extension.extension:landmarkLocation.extension">
      <path value="Extension.extension.extension"/>
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          <type value="value"/>
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      <definition
                  value="May be used to represent additional information that is not part of the basic definition of the element. 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 can 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"/>
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    <element id="Extension.extension:landmarkLocation.extension:code">
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      <sliceName value="code"/>
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                  value="The main type identifier for a lab, procedure, condition, etc., usually drawn from a controlled vocabulary."/>
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    <element id="Extension.extension:landmarkLocation.extension:code.id">
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      <short value="Unique id for inter-element referencing"/>
      <definition
                  value="Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
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    <element id="Extension.extension:landmarkLocation.extension:code.extension">
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                  value="May be used to represent additional information that is not part of the basic definition of the element. 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 can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
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               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."/>
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               value="The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension."/>
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        <path value="Extension.url"/>
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             id="Extension.extension:landmarkLocation.extension:code.valueCodeableConcept">
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                  value="Value of extension - must be one of a constrained set of the data types (see [Extensibility](extensibility.html) for a list)."/>
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    <element id="Extension.extension:landmarkLocation.extension:laterality">
      <path value="Extension.extension.extension"/>
      <sliceName value="laterality"/>
      <definition
                  value="Body side of the body location, if needed to distinguish from a similar location on the other side of the body.

The laterality element is part of BodyLocation, a flexible structure that allows the location to be determined by a single code, or a code plus laterality and/or orientation. The body location can also be specified in relation to one or more body landmarks. SNOMED CT is used in all cases.

* Code only: The code should include (precoordinate) laterality and/orientation to the degree necessary to completely specify the body location.
* Code plus laterality and/or orientation: The basic code augmented by codes specifying the body side and/or anatomical orientation.
* Relation to landmark: The location relative to a landmark is specified by:
1. Establishing the location and type of landmark using a body site code and optional laterality/orientation, and
2. Specifying the direction and distance from the landmark to the body location.

Note that BodyLocation is a data type (a reusable structure), not a stand-alone entity. The concept is similar to how a postal address can apply to a person, location, or organization. This contrasts with FHIR&#39;s stand-alone BodySite (aka BodyStructure in r4) which &#39;is not ... intended for describing the type of anatomical location but rather a specific body site on a specific patient&#39; (FHIR 3.5)."/>
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               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."/>
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                  value="Source of the definition for the extension code - a logical name or a URL."/>
      <comment
               value="The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension."/>
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        <path value="Extension.url"/>
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             id="Extension.extension:landmarkLocation.extension:laterality.valueCodeableConcept">
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                  value="Value of extension - must be one of a constrained set of the data types (see [Extensibility](extensibility.html) for a list)."/>
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      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element
             id="Extension.extension:landmarkLocation.extension:anatomicalOrientation">
      <path value="Extension.extension.extension"/>
      <sliceName value="anatomicalOrientation"/>
      <definition
                  value="AnatomicalOrientation of the body location, if needed to distinguish from a similar location in another orientation.
The orientation element is part of BodyLocation, a flexible structure that allows the location to be determined by a single code, or a code plus laterality and/or orientation. The body location can also be specified in relation to one or more body landmarks. SNOMED CT is used in all cases.

* Code only: The code should include (precoordinate) laterality and/orientation to the degree necessary to completely specify the body location.
* Code plus laterality and/or orientation: The basic code augmented by codes specifying the body side and/or anatomical orientation.
* Relation to landmark: The location relative to a landmark is specified by:
1. Establishing the location and type of landmark using a body site code and optional laterality/orientation, and
2. Specifying the direction and distance from the landmark to the body location.

Note that BodyLocation is a data type (a reusable structure), not a stand-alone entity. The concept is similar to how a postal address can apply to a person, location, or organization. This contrasts with FHIR&#39;s stand-alone BodySite (aka BodyStructure in r4) which &#39;is not ... intended for describing the type of anatomical location but rather a specific body site on a specific patient&#39; (FHIR 3.5)."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element
             id="Extension.extension:landmarkLocation.extension:anatomicalOrientation.id">
      <path value="Extension.extension.extension.id"/>
      <representation value="xmlAttr"/>
      <short value="Unique id for inter-element referencing"/>
      <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>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element
             id="Extension.extension:landmarkLocation.extension:anatomicalOrientation.extension">
      <path value="Extension.extension.extension.extension"/>
      <slicing>
        <discriminator>
          <type value="value"/>
          <path value="url"/>
        </discriminator>
        <description value="Extensions are always sliced by (at least) url"/>
        <rules value="open"/>
      </slicing>
      <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. 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 can 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="0"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element
             id="Extension.extension:landmarkLocation.extension:anatomicalOrientation.url">
      <path value="Extension.extension.extension.url"/>
      <representation value="xmlAttr"/>
      <short value="identifies the meaning of the extension"/>
      <definition
                  value="Source of the definition for the extension code - a logical name or a URL."/>
      <comment
               value="The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.url"/>
        <min value="1"/>
        <max value="1"/>
      </base>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="anatomicalOrientation"/>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element
             id="Extension.extension:landmarkLocation.extension:anatomicalOrientation.valueCodeableConcept">
      <path value="Extension.extension.extension.valueCodeableConcept"/>
      <short value="Value of extension"/>
      <definition
                  value="Value of extension - must be one of a constrained set of the data types (see [Extensibility](extensibility.html) for a list)."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.value[x]"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code value="CodeableConcept"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <binding>
        <strength value="extensible"/>
        <valueSet
                  value="http://hl7.org/fhir/us/odh/ValueSet/obf-datatype-AnatomicalOrientationVS"/>
      </binding>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkLocation.url">
      <path value="Extension.extension.url"/>
      <representation value="xmlAttr"/>
      <short value="identifies the meaning of the extension"/>
      <definition
                  value="Source of the definition for the extension code - a logical name or a URL."/>
      <comment
               value="The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.url"/>
        <min value="1"/>
        <max value="1"/>
      </base>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="landmarkLocation"/>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkLocation.value[x]">
      <path value="Extension.extension.value[x]"/>
      <short value="Value of extension"/>
      <definition
                  value="Value of extension - must be one of a constrained set of the data types (see [Extensibility](extensibility.html) for a list)."/>
      <min value="0"/>
      <max value="0"/>
      <base>
        <path value="Extension.value[x]"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code value="base64Binary"/>
      </type>
      <type>
        <code value="boolean"/>
      </type>
      <type>
        <code value="canonical"/>
      </type>
      <type>
        <code value="code"/>
      </type>
      <type>
        <code value="date"/>
      </type>
      <type>
        <code value="dateTime"/>
      </type>
      <type>
        <code value="decimal"/>
      </type>
      <type>
        <code value="id"/>
      </type>
      <type>
        <code value="instant"/>
      </type>
      <type>
        <code value="integer"/>
      </type>
      <type>
        <code value="markdown"/>
      </type>
      <type>
        <code value="oid"/>
      </type>
      <type>
        <code value="positiveInt"/>
      </type>
      <type>
        <code value="string"/>
      </type>
      <type>
        <code value="time"/>
      </type>
      <type>
        <code value="unsignedInt"/>
      </type>
      <type>
        <code value="uri"/>
      </type>
      <type>
        <code value="url"/>
      </type>
      <type>
        <code value="uuid"/>
      </type>
      <type>
        <code value="Address"/>
      </type>
      <type>
        <code value="Age"/>
      </type>
      <type>
        <code value="Annotation"/>
      </type>
      <type>
        <code value="Attachment"/>
      </type>
      <type>
        <code value="CodeableConcept"/>
      </type>
      <type>
        <code value="Coding"/>
      </type>
      <type>
        <code value="ContactPoint"/>
      </type>
      <type>
        <code value="Count"/>
      </type>
      <type>
        <code value="Distance"/>
      </type>
      <type>
        <code value="Duration"/>
      </type>
      <type>
        <code value="HumanName"/>
      </type>
      <type>
        <code value="Identifier"/>
      </type>
      <type>
        <code value="Money"/>
      </type>
      <type>
        <code value="Period"/>
      </type>
      <type>
        <code value="Quantity"/>
      </type>
      <type>
        <code value="Range"/>
      </type>
      <type>
        <code value="Ratio"/>
      </type>
      <type>
        <code value="Reference"/>
      </type>
      <type>
        <code value="SampledData"/>
      </type>
      <type>
        <code value="Signature"/>
      </type>
      <type>
        <code value="Timing"/>
      </type>
      <type>
        <code value="ContactDetail"/>
      </type>
      <type>
        <code value="Contributor"/>
      </type>
      <type>
        <code value="DataRequirement"/>
      </type>
      <type>
        <code value="Expression"/>
      </type>
      <type>
        <code value="ParameterDefinition"/>
      </type>
      <type>
        <code value="RelatedArtifact"/>
      </type>
      <type>
        <code value="TriggerDefinition"/>
      </type>
      <type>
        <code value="UsageContext"/>
      </type>
      <type>
        <code value="Dosage"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkToBodyLocationDirection">
      <path value="Extension.extension"/>
      <sliceName value="landmarkToBodyLocationDirection"/>
      <definition
                  value="The direction from the landmark to the body location of interest, given as a clockface direction or anatomical direction."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkToBodyLocationDirection.id">
      <path value="Extension.extension.id"/>
      <representation value="xmlAttr"/>
      <short value="Unique id for inter-element referencing"/>
      <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>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkToBodyLocationDirection.extension">
      <path value="Extension.extension.extension"/>
      <slicing>
        <discriminator>
          <type value="value"/>
          <path value="url"/>
        </discriminator>
        <description value="Extensions are always sliced by (at least) url"/>
        <rules value="open"/>
      </slicing>
      <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. 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 can 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="0"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkToBodyLocationDirection.url">
      <path value="Extension.extension.url"/>
      <representation value="xmlAttr"/>
      <short value="identifies the meaning of the extension"/>
      <definition
                  value="Source of the definition for the extension code - a logical name or a URL."/>
      <comment
               value="The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.url"/>
        <min value="1"/>
        <max value="1"/>
      </base>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="landmarkToBodyLocationDirection"/>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element
             id="Extension.extension:landmarkToBodyLocationDirection.valueCodeableConcept">
      <path value="Extension.extension.valueCodeableConcept"/>
      <short value="Value of extension"/>
      <definition
                  value="Value of extension - must be one of a constrained set of the data types (see [Extensibility](extensibility.html) for a list)."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.value[x]"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code value="CodeableConcept"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <binding>
        <strength value="preferred"/>
        <valueSet
                  value="http://hl7.org/fhir/us/odh/ValueSet/obf-datatype-AnatomicalDirectionVS"/>
      </binding>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkToBodyLocationDistance">
      <path value="Extension.extension"/>
      <sliceName value="landmarkToBodyLocationDistance"/>
      <definition
                  value="How far the body location of interest is from the given landmark."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkToBodyLocationDistance.id">
      <path value="Extension.extension.id"/>
      <representation value="xmlAttr"/>
      <short value="Unique id for inter-element referencing"/>
      <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>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkToBodyLocationDistance.extension">
      <path value="Extension.extension.extension"/>
      <slicing>
        <discriminator>
          <type value="value"/>
          <path value="url"/>
        </discriminator>
        <description value="Extensions are always sliced by (at least) url"/>
        <rules value="open"/>
      </slicing>
      <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. 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 can 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="0"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkToBodyLocationDistance.url">
      <path value="Extension.extension.url"/>
      <representation value="xmlAttr"/>
      <short value="identifies the meaning of the extension"/>
      <definition
                  value="Source of the definition for the extension code - a logical name or a URL."/>
      <comment
               value="The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.url"/>
        <min value="1"/>
        <max value="1"/>
      </base>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="landmarkToBodyLocationDistance"/>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element
             id="Extension.extension:landmarkToBodyLocationDistance.valueQuantity">
      <path value="Extension.extension.valueQuantity"/>
      <short value="Value of extension"/>
      <definition
                  value="Value of extension - must be one of a constrained set of the data types (see [Extensibility](extensibility.html) for a list)."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.value[x]"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code value="Quantity"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <binding>
        <strength value="required"/>
        <valueSet
                  value="http://hl7.org/fhir/us/odh/ValueSet/obf-datatype-UnitsOfLengthVS"/>
      </binding>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension.url">
      <path value="Extension.url"/>
      <representation value="xmlAttr"/>
      <short value="identifies the meaning of the extension"/>
      <definition
                  value="Source of the definition for the extension code - a logical name or a URL."/>
      <comment
               value="The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="Extension.url"/>
        <min value="1"/>
        <max value="1"/>
      </base>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri
                value="http://hl7.org/fhir/us/odh/StructureDefinition/obf-datatype-RelationToLandmark-extension"/>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="Extension.value[x]">
      <path value="Extension.value[x]"/>
      <short value="Value of extension"/>
      <definition
                  value="Value of extension - must be one of a constrained set of the data types (see [Extensibility](extensibility.html) for a list)."/>
      <min value="0"/>
      <max value="0"/>
      <base>
        <path value="Extension.value[x]"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code value="base64Binary"/>
      </type>
      <type>
        <code value="boolean"/>
      </type>
      <type>
        <code value="canonical"/>
      </type>
      <type>
        <code value="code"/>
      </type>
      <type>
        <code value="date"/>
      </type>
      <type>
        <code value="dateTime"/>
      </type>
      <type>
        <code value="decimal"/>
      </type>
      <type>
        <code value="id"/>
      </type>
      <type>
        <code value="instant"/>
      </type>
      <type>
        <code value="integer"/>
      </type>
      <type>
        <code value="markdown"/>
      </type>
      <type>
        <code value="oid"/>
      </type>
      <type>
        <code value="positiveInt"/>
      </type>
      <type>
        <code value="string"/>
      </type>
      <type>
        <code value="time"/>
      </type>
      <type>
        <code value="unsignedInt"/>
      </type>
      <type>
        <code value="uri"/>
      </type>
      <type>
        <code value="url"/>
      </type>
      <type>
        <code value="uuid"/>
      </type>
      <type>
        <code value="Address"/>
      </type>
      <type>
        <code value="Age"/>
      </type>
      <type>
        <code value="Annotation"/>
      </type>
      <type>
        <code value="Attachment"/>
      </type>
      <type>
        <code value="CodeableConcept"/>
      </type>
      <type>
        <code value="Coding"/>
      </type>
      <type>
        <code value="ContactPoint"/>
      </type>
      <type>
        <code value="Count"/>
      </type>
      <type>
        <code value="Distance"/>
      </type>
      <type>
        <code value="Duration"/>
      </type>
      <type>
        <code value="HumanName"/>
      </type>
      <type>
        <code value="Identifier"/>
      </type>
      <type>
        <code value="Money"/>
      </type>
      <type>
        <code value="Period"/>
      </type>
      <type>
        <code value="Quantity"/>
      </type>
      <type>
        <code value="Range"/>
      </type>
      <type>
        <code value="Ratio"/>
      </type>
      <type>
        <code value="Reference"/>
      </type>
      <type>
        <code value="SampledData"/>
      </type>
      <type>
        <code value="Signature"/>
      </type>
      <type>
        <code value="Timing"/>
      </type>
      <type>
        <code value="ContactDetail"/>
      </type>
      <type>
        <code value="Contributor"/>
      </type>
      <type>
        <code value="DataRequirement"/>
      </type>
      <type>
        <code value="Expression"/>
      </type>
      <type>
        <code value="ParameterDefinition"/>
      </type>
      <type>
        <code value="RelatedArtifact"/>
      </type>
      <type>
        <code value="TriggerDefinition"/>
      </type>
      <type>
        <code value="UsageContext"/>
      </type>
      <type>
        <code value="Dosage"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
  </snapshot>
  <differential>
    <element id="Extension">
      <path value="Extension"/>
      <short value="RelationToLandmark"/>
      <definition
                  value="The relationship between a landmark that helps determine a body location and the body location itself. The location relative to a landmark is specified by:
* Specifying the location and type of landmark using a body site code and optional laterality/orientation,
* Specifying the direction from the landmark to the body location, and
* Specifying the distance from the landmark to the body location.

The RelationToLandmark element is part of BodyLocation, a flexible structure that allows the location to be determined by a single code, or a code plus laterality and/or orientation. The body location can also be specified in relation to one or more body landmarks. SNOMED CT is used in all cases.

* Code only: The code should include (precoordinate) laterality and/orientation to the degree necessary to completely specify the body location.
* Code plus laterality and/or orientation: The basic code augmented by codes specifying the body side and/or anatomical orientation.
* Relation to landmark: The location relative to a landmark is specified by:
1. Establishing the location and type of landmark using a body site code and optional laterality/orientation, and
2. Specifying the direction and distance from the landmark to the body location.

Note that BodyLocation is a data type (a reusable structure), not a stand-alone entity. The concept is similar to how a postal address can apply to a person, location, or organization. This contrasts with FHIR&#39;s stand-alone BodySite (aka BodyStructure in r4) which &#39;is not ... intended for describing the type of anatomical location but rather a specific body site on a specific patient&#39; (FHIR 3.5)."/>
      <min value="0"/>
      <max value="*"/>
    </element>
    <element id="Extension.extension:landmarkType">
      <path value="Extension.extension"/>
      <sliceName value="landmarkType"/>
      <definition
                  value="The type of feature that constitutes the landmark, particularly if the landmark is an acquired body structure or physical object."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkType.extension">
      <path value="Extension.extension.extension"/>
      <min value="0"/>
      <max value="0"/>
    </element>
    <element id="Extension.extension:landmarkType.url">
      <path value="Extension.extension.url"/>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="landmarkType"/>
    </element>
    <element id="Extension.extension:landmarkType.valueCodeableConcept">
      <path value="Extension.extension.valueCodeableConcept"/>
      <min value="1"/>
      <type>
        <code value="CodeableConcept"/>
      </type>
      <binding>
        <strength value="extensible"/>
        <valueSet
                  value="http://hl7.org/fhir/us/odh/ValueSet/obf-datatype-LandmarkTypeVS"/>
      </binding>
    </element>
    <element id="Extension.extension:landmarkLocation">
      <path value="Extension.extension"/>
      <sliceName value="landmarkLocation"/>
      <definition
                  value="The body location of the landmark, specified by a location code and optional laterality and orientation."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkLocation.extension:code">
      <path value="Extension.extension.extension"/>
      <sliceName value="code"/>
      <definition
                  value="The main type identifier for a lab, procedure, condition, etc., usually drawn from a controlled vocabulary."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkLocation.extension:code.extension">
      <path value="Extension.extension.extension.extension"/>
      <min value="0"/>
      <max value="0"/>
    </element>
    <element id="Extension.extension:landmarkLocation.extension:code.url">
      <path value="Extension.extension.extension.url"/>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="code"/>
    </element>
    <element
             id="Extension.extension:landmarkLocation.extension:code.valueCodeableConcept">
      <path value="Extension.extension.extension.valueCodeableConcept"/>
      <min value="1"/>
      <type>
        <code value="CodeableConcept"/>
      </type>
    </element>
    <element id="Extension.extension:landmarkLocation.extension:laterality">
      <path value="Extension.extension.extension"/>
      <sliceName value="laterality"/>
      <definition
                  value="Body side of the body location, if needed to distinguish from a similar location on the other side of the body.

The laterality element is part of BodyLocation, a flexible structure that allows the location to be determined by a single code, or a code plus laterality and/or orientation. The body location can also be specified in relation to one or more body landmarks. SNOMED CT is used in all cases.

* Code only: The code should include (precoordinate) laterality and/orientation to the degree necessary to completely specify the body location.
* Code plus laterality and/or orientation: The basic code augmented by codes specifying the body side and/or anatomical orientation.
* Relation to landmark: The location relative to a landmark is specified by:
1. Establishing the location and type of landmark using a body site code and optional laterality/orientation, and
2. Specifying the direction and distance from the landmark to the body location.

Note that BodyLocation is a data type (a reusable structure), not a stand-alone entity. The concept is similar to how a postal address can apply to a person, location, or organization. This contrasts with FHIR&#39;s stand-alone BodySite (aka BodyStructure in r4) which &#39;is not ... intended for describing the type of anatomical location but rather a specific body site on a specific patient&#39; (FHIR 3.5)."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element
             id="Extension.extension:landmarkLocation.extension:laterality.extension">
      <path value="Extension.extension.extension.extension"/>
      <min value="0"/>
      <max value="0"/>
    </element>
    <element id="Extension.extension:landmarkLocation.extension:laterality.url">
      <path value="Extension.extension.extension.url"/>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="laterality"/>
    </element>
    <element
             id="Extension.extension:landmarkLocation.extension:laterality.valueCodeableConcept">
      <path value="Extension.extension.extension.valueCodeableConcept"/>
      <min value="1"/>
      <type>
        <code value="CodeableConcept"/>
      </type>
      <binding>
        <strength value="extensible"/>
        <valueSet
                  value="http://hl7.org/fhir/us/odh/ValueSet/obf-datatype-LateralityVS"/>
      </binding>
    </element>
    <element
             id="Extension.extension:landmarkLocation.extension:anatomicalOrientation">
      <path value="Extension.extension.extension"/>
      <sliceName value="anatomicalOrientation"/>
      <definition
                  value="AnatomicalOrientation of the body location, if needed to distinguish from a similar location in another orientation.
The orientation element is part of BodyLocation, a flexible structure that allows the location to be determined by a single code, or a code plus laterality and/or orientation. The body location can also be specified in relation to one or more body landmarks. SNOMED CT is used in all cases.

* Code only: The code should include (precoordinate) laterality and/orientation to the degree necessary to completely specify the body location.
* Code plus laterality and/or orientation: The basic code augmented by codes specifying the body side and/or anatomical orientation.
* Relation to landmark: The location relative to a landmark is specified by:
1. Establishing the location and type of landmark using a body site code and optional laterality/orientation, and
2. Specifying the direction and distance from the landmark to the body location.

Note that BodyLocation is a data type (a reusable structure), not a stand-alone entity. The concept is similar to how a postal address can apply to a person, location, or organization. This contrasts with FHIR&#39;s stand-alone BodySite (aka BodyStructure in r4) which &#39;is not ... intended for describing the type of anatomical location but rather a specific body site on a specific patient&#39; (FHIR 3.5)."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element
             id="Extension.extension:landmarkLocation.extension:anatomicalOrientation.extension">
      <path value="Extension.extension.extension.extension"/>
      <min value="0"/>
      <max value="0"/>
    </element>
    <element
             id="Extension.extension:landmarkLocation.extension:anatomicalOrientation.url">
      <path value="Extension.extension.extension.url"/>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="anatomicalOrientation"/>
    </element>
    <element
             id="Extension.extension:landmarkLocation.extension:anatomicalOrientation.valueCodeableConcept">
      <path value="Extension.extension.extension.valueCodeableConcept"/>
      <min value="1"/>
      <type>
        <code value="CodeableConcept"/>
      </type>
      <binding>
        <strength value="extensible"/>
        <valueSet
                  value="http://hl7.org/fhir/us/odh/ValueSet/obf-datatype-AnatomicalOrientationVS"/>
      </binding>
    </element>
    <element id="Extension.extension:landmarkLocation.url">
      <path value="Extension.extension.url"/>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="landmarkLocation"/>
    </element>
    <element id="Extension.extension:landmarkLocation.value[x]">
      <path value="Extension.extension.value[x]"/>
      <min value="0"/>
      <max value="0"/>
    </element>
    <element id="Extension.extension:landmarkToBodyLocationDirection">
      <path value="Extension.extension"/>
      <sliceName value="landmarkToBodyLocationDirection"/>
      <definition
                  value="The direction from the landmark to the body location of interest, given as a clockface direction or anatomical direction."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkToBodyLocationDirection.extension">
      <path value="Extension.extension.extension"/>
      <min value="0"/>
      <max value="0"/>
    </element>
    <element id="Extension.extension:landmarkToBodyLocationDirection.url">
      <path value="Extension.extension.url"/>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="landmarkToBodyLocationDirection"/>
    </element>
    <element
             id="Extension.extension:landmarkToBodyLocationDirection.valueCodeableConcept">
      <path value="Extension.extension.valueCodeableConcept"/>
      <min value="1"/>
      <type>
        <code value="CodeableConcept"/>
      </type>
      <binding>
        <strength value="preferred"/>
        <valueSet
                  value="http://hl7.org/fhir/us/odh/ValueSet/obf-datatype-AnatomicalDirectionVS"/>
      </binding>
    </element>
    <element id="Extension.extension:landmarkToBodyLocationDistance">
      <path value="Extension.extension"/>
      <sliceName value="landmarkToBodyLocationDistance"/>
      <definition
                  value="How far the body location of interest is from the given landmark."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="Element.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="Extension.extension:landmarkToBodyLocationDistance.extension">
      <path value="Extension.extension.extension"/>
      <min value="0"/>
      <max value="0"/>
    </element>
    <element id="Extension.extension:landmarkToBodyLocationDistance.url">
      <path value="Extension.extension.url"/>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri value="landmarkToBodyLocationDistance"/>
    </element>
    <element
             id="Extension.extension:landmarkToBodyLocationDistance.valueQuantity">
      <path value="Extension.extension.valueQuantity"/>
      <min value="1"/>
      <type>
        <code value="Quantity"/>
      </type>
      <binding>
        <strength value="required"/>
        <valueSet
                  value="http://hl7.org/fhir/us/odh/ValueSet/obf-datatype-UnitsOfLengthVS"/>
      </binding>
    </element>
    <element id="Extension.url">
      <path value="Extension.url"/>
      <type>
        <code value="uri"/>
      </type>
      <fixedUri
                value="http://hl7.org/fhir/us/odh/StructureDefinition/obf-datatype-RelationToLandmark-extension"/>
    </element>
    <element id="Extension.value[x]">
      <path value="Extension.value[x]"/>
      <min value="0"/>
      <max value="0"/>
    </element>
  </differential>
</StructureDefinition>