This page is part of the HL7 FHIR Implementation Guide: minimal Common Oncology Data Elements (mCODE) Release 1 - US Realm | STU1 (v0.9.1: STU 1 Ballot 1) based on FHIR R4. The current version which supercedes this version is 2.0.0. For a full list of available versions, see the Directory of published versions

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ActionRequest

<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="obf-ActionRequest"/>
  <text>
    <status value="generated"/>
    <div xmlns="http://www.w3.org/1999/xhtml">
  <p><b>ActionRequest Profile</b></p>
  <p>Abstract class representing a request for any type of action to be performed.</p>
  <p><b>Mapping Summary</b></p>
  <p><pre>obf.ActionRequest maps to DomainResource:
  Language maps to language
  ImplicitRules maps to implicitRules
  Metadata.VersionId maps to meta.versionId
  Metadata.SourceSystem maps to meta.source
  Metadata.Profile maps to meta.profile
  Metadata.LastUpdated maps to meta.lastUpdated
  Metadata.SecurityLabel maps to meta.security
  Metadata.Tag maps to meta.tag
  Narrative maps to text
</pre></p>
</div>
  </text>
  <url
       value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-ActionRequest"/>
  <version value="0.9.1"/>
  <name value="ActionRequest"/>
  <title value="obf-ActionRequest"/>
  <status value="active"/>
  <date value="2019-08-01T00:00:00-04:00"/>
  <publisher value="HL7 International Clinical Interoperability Council"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://www.hl7.org/Special/committees/cic"/>
    </telecom>
  </contact>
  <description
               value="Abstract class representing a request for any type of action to be performed."/>
  <fhirVersion value="4.0.0"/>
  <mapping>
    <identity value="rim"/>
    <uri value="http://hl7.org/v3"/>
    <name value="RIM Mapping"/>
  </mapping>
  <kind value="resource"/>
  <abstract value="true"/>
  <type value="DomainResource"/>
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/DomainResource"/>
  <derivation value="constraint"/>
  <snapshot>
    <element id="DomainResource">
      <path value="DomainResource"/>
      <short value="obf-ActionRequest"/>
      <definition
                  value="Abstract class representing a request for any type of action to be performed."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="DomainResource"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <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)"/>
      </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))"/>
      </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 or SHALL refer to the containing resource"/>
        <expression
                    value="contained.where(((&#39;#&#39;+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = &#39;#&#39;).exists() or descendants().where(as(canonical) = &#39;#&#39;).exists() or descendants().where(as(canonical) = &#39;#&#39;).exists()).not()).trace(&#39;unmatched&#39;, id).empty()"/>
        <xpath
               value="not(exists(for $contained in f:contained return $contained[not(parent::*/descendant::f:reference/@value=concat(&#39;#&#39;, $contained/*/id/@value) or descendant::f:reference[@value=&#39;#&#39;])]))"/>
      </constraint>
      <constraint>
        <extension
                   url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bestpractice">
          <valueBoolean value="true"/>
        </extension>
        <extension
                   url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bestpractice-explanation">
          <valueMarkdown
                         value="When a resource has no narrative, only systems that fully understand the data can display the resource to a human safely. Including a human readable representation in the resource makes for a much more robust eco-system and cheaper handling of resources by intermediary systems. Some ecosystems restrict distribution of resources to only those systems that do fully understand the resources, and as a consequence implementers may believe that the narrative is superfluous. However experience shows that such eco-systems often open up to new participants over time."/>
        </extension>
        <key value="dom-6"/>
        <severity value="warning"/>
        <human value="A resource should have narrative for robust management"/>
        <expression value="text.div.exists()"/>
        <xpath value="exists(f:text/h:div)"/>
      </constraint>
      <constraint>
        <key value="dom-5"/>
        <severity value="error"/>
        <human
               value="If a resource is contained in another resource, it SHALL NOT have a security label"/>
        <expression value="contained.meta.security.empty()"/>
        <xpath value="not(exists(f:contained/*/f:meta/f:security))"/>
      </constraint>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="Entity. Role, or Act"/>
      </mapping>
    </element>
    <element id="DomainResource.id">
      <path value="DomainResource.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>
      <isModifier value="false"/>
      <isSummary value="true"/>
    </element>
    <element id="DomainResource.meta">
      <path value="DomainResource.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 might 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>
      <isModifier value="false"/>
      <isSummary value="true"/>
    </element>
    <element id="DomainResource.implicitRules">
      <path value="DomainResource.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. Often, this is a reference to an implementation guide that defines the special rules along with other profiles etc."/>
      <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. Often, when used, the URL is a reference to an implementation guide that defines these special rules as part of it&#39;s narrative along with other profiles, value sets, etc."/>
      <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"/>
      <isModifierReason
                        value="This element is labeled as a modifier because the implicit rules may provide additional knowledge about the resource that modifies it&#39;s meaning or interpretation"/>
      <isSummary value="true"/>
    </element>
    <element id="DomainResource.language">
      <path value="DomainResource.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>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <binding>
        <extension
                   url="http://hl7.org/fhir/StructureDefinition/elementdefinition-maxValueSet">
          <valueCanonical value="http://hl7.org/fhir/ValueSet/all-languages"/>
        </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="preferred"/>
        <description value="A human language."/>
        <valueSet value="http://hl7.org/fhir/ValueSet/languages"/>
      </binding>
    </element>
    <element id="DomainResource.text">
      <path value="DomainResource.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 can 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 information 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>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="Act.text?"/>
      </mapping>
    </element>
    <element id="DomainResource.contained">
      <path value="DomainResource.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. Contained resources may have profiles and tags In their meta elements, but SHALL NOT have security labels."/>
      <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>
      <isModifier value="false"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
    <element id="DomainResource.extension">
      <path value="DomainResource.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 resource. 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="3"/>
      <max value="*"/>
      <base>
        <path value="DomainResource.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="DomainResource.extension:status">
      <path value="DomainResource.extension"/>
      <sliceName value="status"/>
      <definition
                  value="A state that relates to the workflow or interpretation of this resource. Certain status values can modify the meaning of the resource, for example, entered-in-error. When a boolean value is used, Status of true indicates the record is active, false means inactive."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-Status-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:identifier">
      <path value="DomainResource.extension"/>
      <sliceName value="identifier"/>
      <definition value="Business identifier or external id for this resource."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-datatype-Identifier-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:subjectofrecord">
      <path value="DomainResource.extension"/>
      <sliceName value="subjectofrecord"/>
      <definition
                  value="The subject of a clinical statement, often called the Patient or the Subject. The SubjectOfRecord typically identifies the clinical record in which this statement is contained. If the statement should be in John Doe&#39;s patient record, then John Doe is the subject of record. When there is no patient, the SubjectOfRecord can also be a location, group, or other entity that statement pertains to. For example, observations concerning a hospital ward would have a Location as the SubjectOfRecord.

Note that the word &#39;Subject&#39; is used here in the sense of a person or entity subjected to observations or actions, not subject as in a conceptual topic, like heart disease."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-SubjectOfRecord-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:carecontext">
      <path value="DomainResource.extension"/>
      <sliceName value="carecontext"/>
      <definition value="The encounter or episode of care"/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-CareContext-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:statementdatetime">
      <path value="DomainResource.extension"/>
      <sliceName value="statementdatetime"/>
      <definition value="The point in time when the statement was created."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-StatementDateTime-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:reasoncode">
      <path value="DomainResource.extension"/>
      <sliceName value="reasoncode"/>
      <definition
                  value="The explanation or justification for the current item or action, as a code.
Reason is a string or CodeableConcept in DSTU2 but in later versions only a CodeableConcept."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-ReasonCode-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:reasonreference">
      <path value="DomainResource.extension"/>
      <sliceName value="reasonreference"/>
      <definition
                  value="The justification, as reference to a condition or observation."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-ReasonReference-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:basedon">
      <path value="DomainResource.extension"/>
      <sliceName value="basedon"/>
      <definition
                  value="The proposal, order, or plan that is partly or wholly fulfilled by this item."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-BasedOn-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:code">
      <path value="DomainResource.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="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-datatype-Code-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:category">
      <path value="DomainResource.extension"/>
      <sliceName value="category"/>
      <definition value="The general type or class of this item."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-datatype-Category-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:requester">
      <path value="DomainResource.extension"/>
      <sliceName value="requester"/>
      <definition value="The person or organization originating this referral"/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-Requester-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:requestintent">
      <path value="DomainResource.extension"/>
      <sliceName value="requestintent"/>
      <definition
                  value="Indicates the level of authority/intentionality associated with the request and where the request fits into the workflow chain."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-RequestIntent-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:expectedperformancetime">
      <path value="DomainResource.extension"/>
      <sliceName value="expectedperformancetime"/>
      <definition
                  value="When an action should be done. If the action is a series or recurs (e.g. daily blood sugar testing in the morning) then a Timing can be used to describe the periodicity."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-ExpectedPerformanceTime-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:expectedperformertype">
      <path value="DomainResource.extension"/>
      <sliceName value="expectedperformertype"/>
      <definition value="What type of party should carry out the testing."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-ExpectedPerformerType-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:expectedperformer">
      <path value="DomainResource.extension"/>
      <sliceName value="expectedperformer"/>
      <definition value="Who this request is being addressed to."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-ExpectedPerformer-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:prioritycode">
      <path value="DomainResource.extension"/>
      <sliceName value="prioritycode"/>
      <definition
                  value="An indication of the importance of an action relative to other actions."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-datatype-PriorityCode-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:annotation">
      <path value="DomainResource.extension"/>
      <sliceName value="annotation"/>
      <definition
                  value="An added or follow-up note, often after the fact, that contains metadata about who made the statement and when."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-Annotation-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.modifierExtension">
      <path value="DomainResource.modifierExtension"/>
      <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="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 and/or the understanding of the containing element&#39;s descendants. Usually modifier elements provide negation or qualification. 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.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself)."/>
      <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."/>
      <requirements
                    value="Modifier extensions allow for extensions that *cannot* be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored.  This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the [definition of modifier extensions](extensibility.html#modifierExtension)."/>
      <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"/>
      <isModifierReason
                        value="Modifier extensions are expected to modify the meaning or interpretation of the resource that contains them"/>
      <isSummary value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="N/A"/>
      </mapping>
    </element>
  </snapshot>
  <differential>
    <element id="DomainResource">
      <path value="DomainResource"/>
      <short value="obf-ActionRequest"/>
      <definition
                  value="Abstract class representing a request for any type of action to be performed."/>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension">
      <path value="DomainResource.extension"/>
      <min value="3"/>
      <max value="*"/>
    </element>
    <element id="DomainResource.extension:status">
      <path value="DomainResource.extension"/>
      <sliceName value="status"/>
      <definition
                  value="A state that relates to the workflow or interpretation of this resource. Certain status values can modify the meaning of the resource, for example, entered-in-error. When a boolean value is used, Status of true indicates the record is active, false means inactive."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-Status-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:identifier">
      <path value="DomainResource.extension"/>
      <sliceName value="identifier"/>
      <definition value="Business identifier or external id for this resource."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-datatype-Identifier-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:subjectofrecord">
      <path value="DomainResource.extension"/>
      <sliceName value="subjectofrecord"/>
      <definition
                  value="The subject of a clinical statement, often called the Patient or the Subject. The SubjectOfRecord typically identifies the clinical record in which this statement is contained. If the statement should be in John Doe&#39;s patient record, then John Doe is the subject of record. When there is no patient, the SubjectOfRecord can also be a location, group, or other entity that statement pertains to. For example, observations concerning a hospital ward would have a Location as the SubjectOfRecord.

Note that the word &#39;Subject&#39; is used here in the sense of a person or entity subjected to observations or actions, not subject as in a conceptual topic, like heart disease."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-SubjectOfRecord-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:carecontext">
      <path value="DomainResource.extension"/>
      <sliceName value="carecontext"/>
      <definition value="The encounter or episode of care"/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-CareContext-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:statementdatetime">
      <path value="DomainResource.extension"/>
      <sliceName value="statementdatetime"/>
      <definition value="The point in time when the statement was created."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-StatementDateTime-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:reasoncode">
      <path value="DomainResource.extension"/>
      <sliceName value="reasoncode"/>
      <definition
                  value="The explanation or justification for the current item or action, as a code.
Reason is a string or CodeableConcept in DSTU2 but in later versions only a CodeableConcept."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-ReasonCode-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:reasonreference">
      <path value="DomainResource.extension"/>
      <sliceName value="reasonreference"/>
      <definition
                  value="The justification, as reference to a condition or observation."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-ReasonReference-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:basedon">
      <path value="DomainResource.extension"/>
      <sliceName value="basedon"/>
      <definition
                  value="The proposal, order, or plan that is partly or wholly fulfilled by this item."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-BasedOn-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:code">
      <path value="DomainResource.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="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-datatype-Code-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:category">
      <path value="DomainResource.extension"/>
      <sliceName value="category"/>
      <definition value="The general type or class of this item."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-datatype-Category-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:requester">
      <path value="DomainResource.extension"/>
      <sliceName value="requester"/>
      <definition value="The person or organization originating this referral"/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-Requester-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:requestintent">
      <path value="DomainResource.extension"/>
      <sliceName value="requestintent"/>
      <definition
                  value="Indicates the level of authority/intentionality associated with the request and where the request fits into the workflow chain."/>
      <min value="1"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-RequestIntent-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:expectedperformancetime">
      <path value="DomainResource.extension"/>
      <sliceName value="expectedperformancetime"/>
      <definition
                  value="When an action should be done. If the action is a series or recurs (e.g. daily blood sugar testing in the morning) then a Timing can be used to describe the periodicity."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-ExpectedPerformanceTime-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:expectedperformertype">
      <path value="DomainResource.extension"/>
      <sliceName value="expectedperformertype"/>
      <definition value="What type of party should carry out the testing."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-ExpectedPerformerType-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:expectedperformer">
      <path value="DomainResource.extension"/>
      <sliceName value="expectedperformer"/>
      <definition value="Who this request is being addressed to."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-ExpectedPerformer-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:prioritycode">
      <path value="DomainResource.extension"/>
      <sliceName value="prioritycode"/>
      <definition
                  value="An indication of the importance of an action relative to other actions."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-datatype-PriorityCode-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
    <element id="DomainResource.extension:annotation">
      <path value="DomainResource.extension"/>
      <sliceName value="annotation"/>
      <definition
                  value="An added or follow-up note, often after the fact, that contains metadata about who made the statement and when."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="DomainResource.extension"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <code value="Extension"/>
        <profile
                 value="http://hl7.org/fhir/us/mcode/StructureDefinition/obf-Annotation-extension"/>
      </type>
      <isModifier value="false"/>
      <isSummary value="false"/>
    </element>
  </differential>
</StructureDefinition>