Netherlands - Generic Functions for data exchange Implementation Guide
0.1.0 - ci-build

Netherlands - Generic Functions for data exchange Implementation Guide, published by Ministerie van Volksgezondheid, Welzijn en Sport. This guide is not an authorized publication; it is the continuous build for version 0.1.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/minvws/generiekefuncties-docs/ and changes regularly. See the Directory of published versions

## Resource Profile: NlGfLocalizationList - Detailed Descriptions

Draft as of 2026-02-17

Definitions for the nl-gf-localization-list resource profile.

- Key Elements Table
- Differential Elements Table
- Snapshot Elements Table

Guidance on how to interpret the contents of this table can be foundhere

0. List
Definition | A list is a curated collection of resources.
Short | A list is a curated collection of resources
Control | 0..*
Is Modifier | false
Summary | false
Alternate Names | Collection, WorkingList, Organizer
Invariants | dom-2: If the resource is contained in another resource, it SHALL NOT contain nested Resources (contained.contained.empty()) dom-3: 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 (contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()) dom-4: If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated (contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()) dom-5: If a resource is contained in another resource, it SHALL NOT have a security label (contained.meta.security.empty()) dom-6: A resource should have narrative for robust management (text.`div`.exists()) lst-1: A list can only have an emptyReason if it is empty (`emptyReason.empty() or entry.empty()`) lst-2: The deleted flag can only be used if the mode of the list is "changes" (`mode = 'changes' or entry.deleted.empty()`) lst-3: An entry date can only be used if the mode of the list is "working" (`mode = 'working' or entry.date.empty()`) lst-1: A list can only have an emptyReason if it is empty (emptyReason.empty() or entry.empty()) lst-2: The deleted flag can only be used if the mode of the list is "changes" (mode = 'changes' or entry.deleted.empty()) lst-3: An entry date can only be used if the mode of the list is "working" (mode = 'working' or entry.date.empty())
2. List.meta
Definition | 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.
Short | Metadata about the resource
Control | 0..01
Type | Meta
Is Modifier | false
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
4. List.implicitRules
Definition | 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.
Short | A set of rules under which this content was created
Comments | 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's narrative along with other profiles, value sets, etc.
Control | 0..01
Type | uri
Is Modifier | true because This element is labeled as a modifier because the implicit rules may provide additional knowledge about the resource that modifies it's meaning or interpretation
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
6. List.language
Definition | The base language in which the resource is written.
Short | Language of the resource content
Comments | 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).
Control | 0..01
Binding | The codes SHOULD be taken from CommonLanguages http://hl7.org/fhir/ValueSet/languages|4.0.1 (preferred to `http://hl7.org/fhir/ValueSet/languages|4.0.1` ) A human language.
Additional Bindings | Purpose
AllLanguages | Max Binding
Type | code
Is Modifier | false
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | false
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
8. List.text
Definition | 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 "clinically safe" for a human to just read the narrative. Resource definitions may define what content should be represented in the narrative to ensure clinical safety.
Short | Text summary of the resource, for human interpretation
Comments | 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 "text blob" or where text is additionally entered raw or narrated and encoded information is added later.
Control | 0..01
Type | Narrative
Is Modifier | false
Summary | false
Alternate Names | narrative, html, xhtml, display
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
10. List.contained
Definition | 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.
Short | Contained, inline Resources
Comments | 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.
Control | 0..0*
Type | Resource
Is Modifier | false
Summary | false
Alternate Names | inline resources, anonymous resources, contained resources
12. List.extension
Definition | An Extension 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.
Short | ExtensionAdditional content defined by implementations
Comments | 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.
Control | 10..*
Type | Extension
Is Modifier | false
Summary | false
Alternate Names | extensions, user content
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
Slicing | This element introduces a set of slices on `List.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
14. List.extension:custodian
Slice Name | custodian
Definition | The organization responsible for the localization record, identified by URA number.
Short | NL Generic Functions Localization Custodian
Comments | The Organization which published the data
Control | 1..1 This element is affected by the following invariants: ele-1
Type | Extension(NL Generic Functions Localization Custodian) (Extension Type: Reference(Organization))
Is Modifier | false
Summary | false
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
16. List.modifierExtension
Definition | 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'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).
Short | Extensions that cannot be ignored
Comments | 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.
Control | 0..*
Type | Extension
Is Modifier | true because Modifier extensions are expected to modify the meaning or interpretation of the resource that contains them
Summary | false
Requirements | 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.
Alternate Names | extensions, user content
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
18. List.identifier
Definition | Identifier for the List assigned for business purposes outside the context of FHIR.
Short | Business identifier
Note | This is a business identifier, not a resource identifier (see discussion)
Control | 0..0*
Type | Identifier
Is Modifier | false
Summary | false
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
20. List.status
Definition | Indicates the current state of this list.
Short | current | retired | entered-in-error
Comments | All records are always current This element is labeled as a modifier because the status contains codes that mark the resource as not currently valid.
Control | 1..1
Binding | The codes SHALL be taken from ListStatus http://hl7.org/fhir/ValueSet/list-status|4.0.1 (required to `http://hl7.org/fhir/ValueSet/list-status|4.0.1` ) The current state of the list.
Type | code
Is Modifier | true because This element is labeled as a modifier because it is a status element that contains status entered-in-error which means that the resource should not be treated as valid
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Pattern Value | `current`
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
22. List.mode
Definition | How this list was prepared - whether it is a working list that is suitable for being maintained on an ongoing basis, or if it represents a snapshot of a list of items from another source, or whether it is a prepared list where items may be marked as added, modified or deleted.
Short | working | snapshot | changes
Comments | This element is labeled as a modifier because a change list must not be misunderstood as a complete list.
Control | 1..1
Binding | The codes SHALL be taken from ListMode http://hl7.org/fhir/ValueSet/list-mode|4.0.1 (required to `http://hl7.org/fhir/ValueSet/list-mode|4.0.1` ) The processing mode that applies to this list.
Type | code
Is Modifier | true because If set to "changes", the list is considered incomplete, while the other two codes indicate the list is complete, which changes the understanding of the elements listed
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Requirements | Lists are used in various ways, and it must be known in what way it is safe to use them.
Pattern Value | `working`
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
24. List.title
Definition | A label for the list assigned by the author.
Short | Descriptive name for the list
Control | 0..01
Type | string
Is Modifier | false
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Requirements | Allows customization beyond just the code identifying the kind of list.
Example | General: Dr. Jane's Patients
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
26. List.code
Definition | This code defines the purpose of the list - why it was created.
Short | What the purpose of this list is
Comments | If there is no code, the purpose of the list is implied where it is used, such as in a document section using Document.section.code.
Control | 10..1
Binding | The codes SHALL be taken from For example codes, see NL GF Zorgcontext ValueSet http://hl7.org/fhir/ValueSet/list-example-codes|4.0.1 (required to `http://minvws.github.io/generiekefuncties-docs/ValueSet/nl-gf-zorgcontext-vs` )
Type | CodeableConcept
Is Modifier | false
Summary | true
Requirements | Lists often contain subsets of resources rather than an exhaustive list. The code identifies what type of subset is included.
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
28. List.subject
Definition | The common subject (or patient) of the resources that are in the list if there is one.
Short | If all resources have the same subject
Comments | Some purely arbitrary lists do not have a common subject, so this is optional.
Control | 10..1
Type | Reference(Patient, Patient, Group, Device, Location)
Is Modifier | false
Summary | true
Requirements | The primary purpose of listing the subject explicitly is to help with finding the right list.
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
30. List.subject.reference
Definition | A reference to a location at which the other resource is found. The reference may be a relative reference, in which case it is relative to the service base URL, or an absolute URL that resolves to the location where the resource is found. The reference may be version specific or not. If the reference is not to a FHIR RESTful server, then it should be assumed to be version specific. Internal fragment references (start with '#') refer to contained resources.
Short | Literal reference, Relative, internal or absolute URL
Comments | Using absolute URLs provides a stable scalable approach suitable for a cloud/web context, while using relative/logical references provides a flexible approach suitable for use when trading across closed eco-system boundaries. Absolute URLs do not need to point to a FHIR RESTful server, though this is the preferred approach. If the URL conforms to the structure "/[type]/[id]" then it should be assumed that the reference is to a FHIR RESTful server.
Control | 0..01 This element is affected by the following invariants: ref-1
Type | string
Is Modifier | false
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
32. List.subject.identifier
Definition | An identifier for the target resource. This is used when there is no way to reference the other resource directly, either because the entity it represents is not available through a FHIR server, or because there is no way for the author of the resource to convert a known identifier to an actual location. There is no requirement that a Reference.identifier point to something that is actually exposed as a FHIR instance, but it SHALL point to a business concept that would be expected to be exposed as a FHIR instance, and that instance would need to be of a FHIR resource type allowed by the reference.
Short | Logical reference, when literal reference is not known
Comments | When an identifier is provided in place of a reference, any system processing the reference will only be able to resolve the identifier to a reference if it understands the business context in which the identifier is used. Sometimes this is global (e.g. a national identifier) but often it is not. For this reason, none of the useful mechanisms described for working with references (e.g. chaining, includes) are possible, nor should servers be expected to be able resolve the reference. Servers may accept an identifier based reference untouched, resolve it, and/or reject it - see CapabilityStatement.rest.resource.referencePolicy. When both an identifier and a literal reference are provided, the literal reference is preferred. Applications processing the resource are allowed - but not required - to check that the identifier matches the literal reference Applications converting a logical reference to a literal reference may choose to leave the logical reference present, or remove it. Reference is intended to point to a structure that can potentially be expressed as a FHIR resource, though there is no need for it to exist as an actual FHIR resource instance - except in as much as an application wishes to actual find the target of the reference. The content referred to be the identifier must meet the logical constraints implied by any limitations on what resource types are permitted for the reference. For example, it would not be legitimate to send the identifier for a drug prescription if the type were Reference(Observation|DiagnosticReport). One of the use-cases for Reference.identifier is the situation where no FHIR representation exists (where the type is Reference (Any).
Note | This is a business identifier, not a resource identifier (see discussion)
Control | 10..1
Type | Identifier(Pseudo-BSN Identifier)
Is Modifier | false
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
34. List.source
Definition | The entity responsible for deciding what the contents of the list were. Where the list was created by a human, this is the same as the author of the list.
Short | Who and/or what defined the list contents (aka Author)
Comments | The primary source is the entity that made the decisions what items are in the list. This may be software or user.
Control | 10..1
Type | Reference(Device, Practitioner, PractitionerRole, Patient, Device)
Is Modifier | false
Summary | true
Requirements | Allows follow-up as well as context.
Alternate Names | Author
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
36. List.source.reference
Definition | A reference to a location at which the other resource is found. The reference may be a relative reference, in which case it is relative to the service base URL, or an absolute URL that resolves to the location where the resource is found. The reference may be version specific or not. If the reference is not to a FHIR RESTful server, then it should be assumed to be version specific. Internal fragment references (start with '#') refer to contained resources.
Short | Literal reference, Relative, internal or absolute URL
Comments | Using absolute URLs provides a stable scalable approach suitable for a cloud/web context, while using relative/logical references provides a flexible approach suitable for use when trading across closed eco-system boundaries. Absolute URLs do not need to point to a FHIR RESTful server, though this is the preferred approach. If the URL conforms to the structure "/[type]/[id]" then it should be assumed that the reference is to a FHIR RESTful server.
Control | 0..01 This element is affected by the following invariants: ref-1
Type | string
Is Modifier | false
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
38. List.source.type
Definition | The expected type of the target of the reference. If both Reference.type and Reference.reference are populated and Reference.reference is a FHIR URL, both SHALL be consistent. The type is the Canonical URL of Resource Definition that is the type this reference refers to. References are URLs that are relative to http://hl7.org/fhir/StructureDefinition/ e.g. "Patient" is a reference to http://hl7.org/fhir/StructureDefinition/Patient. Absolute URLs are only allowed for logical models (and can only be used in references in logical models, not resources).
Short | Type the reference refers to (e.g. "Patient")
Comments | This element is used to indicate the type of the target of the reference. This may be used which ever of the other elements are populated (or not). In some cases, the type of the target may be determined by inspection of the reference (e.g. a RESTful URL) or by resolving the target of the reference; if both the type and a reference is provided, the reference SHALL resolve to a resource of the same type as that specified.
Control | 0..1
Binding | Unless not suitable, these codes SHALL be taken from ResourceType http://hl7.org/fhir/ValueSet/resource-types|4.0.1 (extensible to `http://hl7.org/fhir/ValueSet/resource-types|4.0.1` ) Aa resource (or, for logical models, the URI of the logical model).
Type | uri
Is Modifier | false
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Pattern Value | `Device`
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
40. List.note
Definition | Comments that apply to the overall list.
Short | Comments about the list
Control | 0..0*
Type | Annotation
Is Modifier | false
Summary | false
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
42. List.entry
Definition | Entries in this list.
Short | Entries in the list
Comments | If there are no entries in the list, an emptyReason SHOULD be provided.
Control | 0..0* This element is affected by the following invariants: lst-1
Type | BackboneElement
Is Modifier | false
Summary | false
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
47. List.emptyReason
Definition | If the list is empty, why the list is empty.
Short | Why list is empty
Comments | The various reasons for an empty list make a significant interpretation to its interpretation. Note that this code is for use when the entire list has been suppressed, and not for when individual items are omitted - implementers may consider using a text note or a flag on an entry in these cases.
Control | 10..1 This element is affected by the following invariants: lst-1
Binding | The codes SHOULD be taken from ListEmptyReasons http://hl7.org/fhir/ValueSet/list-empty-reason|4.0.1 (preferred to `http://hl7.org/fhir/ValueSet/list-empty-reason|4.0.1` ) If a list is empty, why it is empty.
Type | CodeableConcept
Is Modifier | false
Summary | false
Requirements | Allows capturing things like "none exist" or "not asked" which can be important for most lists.
Pattern Value | `{ "coding" : [{ "system" : "http://terminology.hl7.org/CodeSystem/list-empty-reason", "code" : "withheld" }] }`
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))

Guidance on how to interpret the contents of this table can be foundhere

0. List
2. List.meta
Control | 0..0
4. List.implicitRules
Control | 0..0
6. List.language
Control | 0..0
8. List.text
Control | 0..0
10. List.contained
Control | 0..0
12. List.extension
Control | 1..?
Slicing | This element introduces a set of slices on `List.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
14. List.extension:custodian
Slice Name | custodian
Comments | The Organization which published the data
Control | 1..1
Type | Extension(NL Generic Functions Localization Custodian) (Extension Type: Reference(Organization))
16. List.identifier
Note | This is a business identifier, not a resource identifier (see discussion)
Control | 0..0
18. List.status
Comments | All records are always current
Pattern Value | `current`
20. List.mode
Pattern Value | `working`
22. List.title
Control | 0..0
24. List.code
Control | 1..?
Binding | The codes SHALL be taken from NL GF Zorgcontext ValueSet (required to `http://minvws.github.io/generiekefuncties-docs/ValueSet/nl-gf-zorgcontext-vs` )
26. List.subject
Control | 1..?
Type | Reference(Patient)
28. List.subject.reference
Control | 0..0
30. List.subject.identifier
Note | This is a business identifier, not a resource identifier (see discussion)
Control | 1..?
Type | Identifier(Pseudo-BSN Identifier)
32. List.source
Control | 1..?
Type | Reference(Device)
34. List.source.reference
Control | 0..0
36. List.source.type
Pattern Value | `Device`
38. List.note
Control | 0..0
40. List.entry
Control | 0..0
42. List.emptyReason
Control | 1..?
Pattern Value | `{ "coding" : [{ "system" : "http://terminology.hl7.org/CodeSystem/list-empty-reason", "code" : "withheld" }] }`

Guidance on how to interpret the contents of this table can be foundhere

0. List
Definition | A list is a curated collection of resources.
Short | A list is a curated collection of resources
Control | 0..*
Is Modifier | false
Summary | false
Alternate Names | Collection, WorkingList, Organizer
Invariants | dom-2: If the resource is contained in another resource, it SHALL NOT contain nested Resources (`contained.contained.empty()`) dom-3: 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 (`contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()`) dom-4: If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated (`contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()`) dom-5: If a resource is contained in another resource, it SHALL NOT have a security label (`contained.meta.security.empty()`) dom-6: A resource should have narrative for robust management (`text.`div`.exists()`) lst-1: A list can only have an emptyReason if it is empty (`emptyReason.empty() or entry.empty()`) lst-2: The deleted flag can only be used if the mode of the list is "changes" (`mode = 'changes' or entry.deleted.empty()`) lst-3: An entry date can only be used if the mode of the list is "working" (`mode = 'working' or entry.date.empty()`)
2. List.id
Definition | The logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes.
Short | Logical id of this artifact
Comments | The only time that a resource does not have an id is when it is being submitted to the server using a create operation.
Control | 0..1
Type | id
Is Modifier | false
Summary | true
4. List.meta
Definition | 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.
Short | Metadata about the resource
Control | 0..0
Type | Meta
Is Modifier | false
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
6. List.implicitRules
Definition | 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.
Short | A set of rules under which this content was created
Comments | 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's narrative along with other profiles, value sets, etc.
Control | 0..0
Type | uri
Is Modifier | true because This element is labeled as a modifier because the implicit rules may provide additional knowledge about the resource that modifies it's meaning or interpretation
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
8. List.language
Definition | The base language in which the resource is written.
Short | Language of the resource content
Comments | 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).
Control | 0..0
Binding | The codes SHOULD be taken from CommonLanguages (preferred to `http://hl7.org/fhir/ValueSet/languages|4.0.1` ) A human language.
Additional Bindings | Purpose
AllLanguages | Max Binding
Type | code
Is Modifier | false
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | false
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
10. List.text
Definition | 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 "clinically safe" for a human to just read the narrative. Resource definitions may define what content should be represented in the narrative to ensure clinical safety.
Short | Text summary of the resource, for human interpretation
Comments | 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 "text blob" or where text is additionally entered raw or narrated and encoded information is added later.
Control | 0..0
Type | Narrative
Is Modifier | false
Summary | false
Alternate Names | narrative, html, xhtml, display
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
12. List.contained
Definition | 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.
Short | Contained, inline Resources
Comments | 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.
Control | 0..0
Type | Resource
Is Modifier | false
Summary | false
Alternate Names | inline resources, anonymous resources, contained resources
14. List.extension
Definition | An Extension
Short | Extension
Control | 1..*
Type | Extension
Is Modifier | false
Summary | false
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing | This element introduces a set of slices on `List.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
16. List.extension:custodian
Slice Name | custodian
Definition | The organization responsible for the localization record, identified by URA number.
Short | NL Generic Functions Localization Custodian
Comments | The Organization which published the data
Control | 1..1 This element is affected by the following invariants: ele-1
Type | Extension(NL Generic Functions Localization Custodian) (Extension Type: Reference(Organization))
Is Modifier | false
Summary | false
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
18. List.modifierExtension
Definition | 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'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).
Short | Extensions that cannot be ignored
Comments | 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.
Control | 0..*
Type | Extension
Is Modifier | true because Modifier extensions are expected to modify the meaning or interpretation of the resource that contains them
Summary | false
Requirements | 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.
Alternate Names | extensions, user content
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
20. List.identifier
Definition | Identifier for the List assigned for business purposes outside the context of FHIR.
Short | Business identifier
Note | This is a business identifier, not a resource identifier (see discussion)
Control | 0..0
Type | Identifier
Is Modifier | false
Summary | false
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
22. List.status
Definition | Indicates the current state of this list.
Short | current | retired | entered-in-error
Comments | All records are always current
Control | 1..1
Binding | The codes SHALL be taken from ListStatus (required to `http://hl7.org/fhir/ValueSet/list-status|4.0.1` ) The current state of the list.
Type | code
Is Modifier | true because This element is labeled as a modifier because it is a status element that contains status entered-in-error which means that the resource should not be treated as valid
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Pattern Value | `current`
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
24. List.mode
Definition | How this list was prepared - whether it is a working list that is suitable for being maintained on an ongoing basis, or if it represents a snapshot of a list of items from another source, or whether it is a prepared list where items may be marked as added, modified or deleted.
Short | working | snapshot | changes
Comments | This element is labeled as a modifier because a change list must not be misunderstood as a complete list.
Control | 1..1
Binding | The codes SHALL be taken from ListMode (required to `http://hl7.org/fhir/ValueSet/list-mode|4.0.1` ) The processing mode that applies to this list.
Type | code
Is Modifier | true because If set to "changes", the list is considered incomplete, while the other two codes indicate the list is complete, which changes the understanding of the elements listed
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Requirements | Lists are used in various ways, and it must be known in what way it is safe to use them.
Pattern Value | `working`
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
26. List.title
Definition | A label for the list assigned by the author.
Short | Descriptive name for the list
Control | 0..0
Type | string
Is Modifier | false
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Requirements | Allows customization beyond just the code identifying the kind of list.
Example | General: Dr. Jane's Patients
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
28. List.code
Definition | This code defines the purpose of the list - why it was created.
Short | What the purpose of this list is
Comments | If there is no code, the purpose of the list is implied where it is used, such as in a document section using Document.section.code.
Control | 1..1
Binding | The codes SHALL be taken from NL GF Zorgcontext ValueSet (required to `http://minvws.github.io/generiekefuncties-docs/ValueSet/nl-gf-zorgcontext-vs` )
Type | CodeableConcept
Is Modifier | false
Summary | true
Requirements | Lists often contain subsets of resources rather than an exhaustive list. The code identifies what type of subset is included.
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
30. List.subject
Definition | The common subject (or patient) of the resources that are in the list if there is one.
Short | If all resources have the same subject
Comments | Some purely arbitrary lists do not have a common subject, so this is optional.
Control | 1..1
Type | Reference(Patient)
Is Modifier | false
Summary | true
Requirements | The primary purpose of listing the subject explicitly is to help with finding the right list.
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
32. List.subject.id
Definition | Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short | Unique id for inter-element referencing
Control | 0..1
Type | string
Is Modifier | false
XML Format | In the XML format, this property is represented as an attribute.
Summary | false
34. List.subject.extension
Definition | 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.
Short | Additional content defined by implementations
Comments | 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.
Control | 0..*
Type | Extension
Is Modifier | false
Summary | false
Alternate Names | extensions, user content
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing | This element introduces a set of slices on `List.subject.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
36. List.subject.reference
Definition | A reference to a location at which the other resource is found. The reference may be a relative reference, in which case it is relative to the service base URL, or an absolute URL that resolves to the location where the resource is found. The reference may be version specific or not. If the reference is not to a FHIR RESTful server, then it should be assumed to be version specific. Internal fragment references (start with '#') refer to contained resources.
Short | Literal reference, Relative, internal or absolute URL
Comments | Using absolute URLs provides a stable scalable approach suitable for a cloud/web context, while using relative/logical references provides a flexible approach suitable for use when trading across closed eco-system boundaries. Absolute URLs do not need to point to a FHIR RESTful server, though this is the preferred approach. If the URL conforms to the structure "/[type]/[id]" then it should be assumed that the reference is to a FHIR RESTful server.
Control | 0..0 This element is affected by the following invariants: ref-1
Type | string
Is Modifier | false
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
38. List.subject.type
Definition | The expected type of the target of the reference. If both Reference.type and Reference.reference are populated and Reference.reference is a FHIR URL, both SHALL be consistent. The type is the Canonical URL of Resource Definition that is the type this reference refers to. References are URLs that are relative to http://hl7.org/fhir/StructureDefinition/ e.g. "Patient" is a reference to http://hl7.org/fhir/StructureDefinition/Patient. Absolute URLs are only allowed for logical models (and can only be used in references in logical models, not resources).
Short | Type the reference refers to (e.g. "Patient")
Comments | This element is used to indicate the type of the target of the reference. This may be used which ever of the other elements are populated (or not). In some cases, the type of the target may be determined by inspection of the reference (e.g. a RESTful URL) or by resolving the target of the reference; if both the type and a reference is provided, the reference SHALL resolve to a resource of the same type as that specified.
Control | 0..1
Binding | Unless not suitable, these codes SHALL be taken from ResourceType (extensible to `http://hl7.org/fhir/ValueSet/resource-types|4.0.1` ) Aa resource (or, for logical models, the URI of the logical model).
Type | uri
Is Modifier | false
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
40. List.subject.identifier
Definition | An identifier for the target resource. This is used when there is no way to reference the other resource directly, either because the entity it represents is not available through a FHIR server, or because there is no way for the author of the resource to convert a known identifier to an actual location. There is no requirement that a Reference.identifier point to something that is actually exposed as a FHIR instance, but it SHALL point to a business concept that would be expected to be exposed as a FHIR instance, and that instance would need to be of a FHIR resource type allowed by the reference.
Short | Logical reference, when literal reference is not known
Comments | When an identifier is provided in place of a reference, any system processing the reference will only be able to resolve the identifier to a reference if it understands the business context in which the identifier is used. Sometimes this is global (e.g. a national identifier) but often it is not. For this reason, none of the useful mechanisms described for working with references (e.g. chaining, includes) are possible, nor should servers be expected to be able resolve the reference. Servers may accept an identifier based reference untouched, resolve it, and/or reject it - see CapabilityStatement.rest.resource.referencePolicy. When both an identifier and a literal reference are provided, the literal reference is preferred. Applications processing the resource are allowed - but not required - to check that the identifier matches the literal reference Applications converting a logical reference to a literal reference may choose to leave the logical reference present, or remove it. Reference is intended to point to a structure that can potentially be expressed as a FHIR resource, though there is no need for it to exist as an actual FHIR resource instance - except in as much as an application wishes to actual find the target of the reference. The content referred to be the identifier must meet the logical constraints implied by any limitations on what resource types are permitted for the reference. For example, it would not be legitimate to send the identifier for a drug prescription if the type were Reference(Observation|DiagnosticReport). One of the use-cases for Reference.identifier is the situation where no FHIR representation exists (where the type is Reference (Any).
Note | This is a business identifier, not a resource identifier (see discussion)
Control | 1..1
Type | Identifier(Pseudo-BSN Identifier)
Is Modifier | false
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
42. List.subject.display
Definition | Plain text narrative that identifies the resource in addition to the resource reference.
Short | Text alternative for the resource
Comments | This is generally not the same as the Resource.text of the referenced resource. The purpose is to identify what's being referenced, not to fully describe it.
Control | 0..1
Type | string
Is Modifier | false
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
44. List.encounter
Definition | The encounter that is the context in which this list was created.
Short | Context in which list created
Control | 0..1
Type | Reference(Encounter)
Is Modifier | false
Summary | false
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
46. List.date
Definition | The date that the list was prepared.
Short | When the list was prepared
Comments | The actual important date is the date of currency of the resources that were summarized, but it is usually assumed that these are current when the preparation occurs.
Control | 0..1
Type | dateTime
Is Modifier | false
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Requirements | Identifies how current the list is which affects relevance.
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
48. List.source
Definition | The entity responsible for deciding what the contents of the list were. Where the list was created by a human, this is the same as the author of the list.
Short | Who and/or what defined the list contents (aka Author)
Comments | The primary source is the entity that made the decisions what items are in the list. This may be software or user.
Control | 1..1
Type | Reference(Device)
Is Modifier | false
Summary | true
Requirements | Allows follow-up as well as context.
Alternate Names | Author
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
50. List.source.id
Definition | Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short | Unique id for inter-element referencing
Control | 0..1
Type | string
Is Modifier | false
XML Format | In the XML format, this property is represented as an attribute.
Summary | false
52. List.source.extension
Definition | 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.
Short | Additional content defined by implementations
Comments | 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.
Control | 0..*
Type | Extension
Is Modifier | false
Summary | false
Alternate Names | extensions, user content
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing | This element introduces a set of slices on `List.source.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
54. List.source.reference
Definition | A reference to a location at which the other resource is found. The reference may be a relative reference, in which case it is relative to the service base URL, or an absolute URL that resolves to the location where the resource is found. The reference may be version specific or not. If the reference is not to a FHIR RESTful server, then it should be assumed to be version specific. Internal fragment references (start with '#') refer to contained resources.
Short | Literal reference, Relative, internal or absolute URL
Comments | Using absolute URLs provides a stable scalable approach suitable for a cloud/web context, while using relative/logical references provides a flexible approach suitable for use when trading across closed eco-system boundaries. Absolute URLs do not need to point to a FHIR RESTful server, though this is the preferred approach. If the URL conforms to the structure "/[type]/[id]" then it should be assumed that the reference is to a FHIR RESTful server.
Control | 0..0 This element is affected by the following invariants: ref-1
Type | string
Is Modifier | false
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
56. List.source.type
Definition | The expected type of the target of the reference. If both Reference.type and Reference.reference are populated and Reference.reference is a FHIR URL, both SHALL be consistent. The type is the Canonical URL of Resource Definition that is the type this reference refers to. References are URLs that are relative to http://hl7.org/fhir/StructureDefinition/ e.g. "Patient" is a reference to http://hl7.org/fhir/StructureDefinition/Patient. Absolute URLs are only allowed for logical models (and can only be used in references in logical models, not resources).
Short | Type the reference refers to (e.g. "Patient")
Comments | This element is used to indicate the type of the target of the reference. This may be used which ever of the other elements are populated (or not). In some cases, the type of the target may be determined by inspection of the reference (e.g. a RESTful URL) or by resolving the target of the reference; if both the type and a reference is provided, the reference SHALL resolve to a resource of the same type as that specified.
Control | 0..1
Binding | Unless not suitable, these codes SHALL be taken from ResourceType (extensible to `http://hl7.org/fhir/ValueSet/resource-types|4.0.1` ) Aa resource (or, for logical models, the URI of the logical model).
Type | uri
Is Modifier | false
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Pattern Value | `Device`
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
58. List.source.identifier
Definition | An identifier for the target resource. This is used when there is no way to reference the other resource directly, either because the entity it represents is not available through a FHIR server, or because there is no way for the author of the resource to convert a known identifier to an actual location. There is no requirement that a Reference.identifier point to something that is actually exposed as a FHIR instance, but it SHALL point to a business concept that would be expected to be exposed as a FHIR instance, and that instance would need to be of a FHIR resource type allowed by the reference.
Short | Logical reference, when literal reference is not known
Comments | When an identifier is provided in place of a reference, any system processing the reference will only be able to resolve the identifier to a reference if it understands the business context in which the identifier is used. Sometimes this is global (e.g. a national identifier) but often it is not. For this reason, none of the useful mechanisms described for working with references (e.g. chaining, includes) are possible, nor should servers be expected to be able resolve the reference. Servers may accept an identifier based reference untouched, resolve it, and/or reject it - see CapabilityStatement.rest.resource.referencePolicy. When both an identifier and a literal reference are provided, the literal reference is preferred. Applications processing the resource are allowed - but not required - to check that the identifier matches the literal reference Applications converting a logical reference to a literal reference may choose to leave the logical reference present, or remove it. Reference is intended to point to a structure that can potentially be expressed as a FHIR resource, though there is no need for it to exist as an actual FHIR resource instance - except in as much as an application wishes to actual find the target of the reference. The content referred to be the identifier must meet the logical constraints implied by any limitations on what resource types are permitted for the reference. For example, it would not be legitimate to send the identifier for a drug prescription if the type were Reference(Observation|DiagnosticReport). One of the use-cases for Reference.identifier is the situation where no FHIR representation exists (where the type is Reference (Any).
Note | This is a business identifier, not a resource identifier (see discussion)
Control | 0..1
Type | Identifier
Is Modifier | false
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
60. List.source.display
Definition | Plain text narrative that identifies the resource in addition to the resource reference.
Short | Text alternative for the resource
Comments | This is generally not the same as the Resource.text of the referenced resource. The purpose is to identify what's being referenced, not to fully describe it.
Control | 0..1
Type | string
Is Modifier | false
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
62. List.orderedBy
Definition | What order applies to the items in the list.
Short | What order the list has
Comments | Applications SHOULD render ordered lists in the order provided, but MAY allow users to re-order based on their own preferences as well. If there is no order specified, the order is unknown, though there may still be some order.
Control | 0..1
Binding | The codes SHOULD be taken from ListOrderCodes (preferred to `http://hl7.org/fhir/ValueSet/list-order|4.0.1` ) What order applies to the items in a list.
Type | CodeableConcept
Is Modifier | false
Summary | false
Requirements | Important for presentation and rendering. Lists may be sorted to place more important information first or to group related entries.
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
64. List.note
Definition | Comments that apply to the overall list.
Short | Comments about the list
Control | 0..0
Type | Annotation
Is Modifier | false
Summary | false
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
66. List.entry
Definition | Entries in this list.
Short | Entries in the list
Comments | If there are no entries in the list, an emptyReason SHOULD be provided.
Control | 0..0 This element is affected by the following invariants: lst-1
Type | BackboneElement
Is Modifier | false
Summary | false
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
75. List.emptyReason
Definition | If the list is empty, why the list is empty.
Short | Why list is empty
Comments | The various reasons for an empty list make a significant interpretation to its interpretation. Note that this code is for use when the entire list has been suppressed, and not for when individual items are omitted - implementers may consider using a text note or a flag on an entry in these cases.
Control | 1..1 This element is affected by the following invariants: lst-1
Binding | The codes SHOULD be taken from ListEmptyReasons (preferred to `http://hl7.org/fhir/ValueSet/list-empty-reason|4.0.1` ) If a list is empty, why it is empty.
Type | CodeableConcept
Is Modifier | false
Summary | false
Requirements | Allows capturing things like "none exist" or "not asked" which can be important for most lists.
Pattern Value | `{ "coding" : [{ "system" : "http://terminology.hl7.org/CodeSystem/list-empty-reason", "code" : "withheld" }] }`
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)