Subscriptions R5 Backport
1.0.0 - Standard for Trial Use International flag

Subscriptions R5 Backport, published by HL7 FHIR Infrastructure WG. This is not an authorized publication; it is the continuous build for version 1.0.0). This version is based on the current content of https://github.com/HL7/fhir-subscription-backport-ig/ and changes regularly. See the Directory of published versions

Resource Profile: BackportSubscription - Detailed Descriptions

Active as of 2022-07-18

Definitions for the backport-subscription resource profile.

1. Subscription
Definition

The subscription resource is used to define a push-based subscription from a server to another system. Once a subscription is registered with the server, the server checks every resource that is created or updated, and if the resource matches the given criteria, it sends a message on the defined "channel" so that another system can take an appropriate action.

Control0..*
Alternate NamesWebHook, Hook, Routing Rule
InvariantsDefined on this element
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.exists() and ('#'+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(uri) = '#').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())
2. Subscription.id
Definition

The logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes.

Control0..1
Typeid
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.

3. Subscription.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.

Control0..1
TypeMeta
InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
4. Subscription.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.

Control0..1
Typeuri
Is Modifiertrue
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.

InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
5. Subscription.language
Definition

The base language in which the resource is written.

Control0..1
BindingThe codes SHOULD be taken from CommonLanguages IETF language tag

Additional BindingsPurpose
AllLanguagesMax Binding
Typecode
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).

InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
6. Subscription.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.

Control0..1
TypeNarrative
Alternate Namesnarrative, html, xhtml, display
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.

InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
7. Subscription.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.

Control0..*
TypeResource
Alternate Namesinline resources, anonymous resources, contained 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.

InvariantsDefined on this element
dom-r4b: Containing new R4B resources within R4 resources may cause interoperability issues if instances are shared with R4 systems (: ($this is Citation or $this is Evidence or $this is EvidenceReport or $this is EvidenceVariable or $this is MedicinalProductDefinition or $this is PackagedProductDefinition or $this is AdministrableProductDefinition or $this is Ingredient or $this is ClinicalUseDefinition or $this is RegulatedAuthorization or $this is SubstanceDefinition or $this is SubscriptionStatus or $this is SubscriptionTopic) implies (%resource is Citation or %resource is Evidence or %resource is EvidenceReport or %resource is EvidenceVariable or %resource is MedicinalProductDefinition or %resource is PackagedProductDefinition or %resource is AdministrableProductDefinition or %resource is Ingredient or %resource is ClinicalUseDefinition or %resource is RegulatedAuthorization or %resource is SubstanceDefinition or %resource is SubscriptionStatus or %resource is SubscriptionTopic))
8. Subscription.extension
Definition

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.

Control0..*
TypeExtension
Alternate Namesextensions, user content
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.

InvariantsDefined on this element
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())
9. Subscription.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).

Control0..*
TypeExtension
Is Modifiertrue
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 Namesextensions, user content
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.

InvariantsDefined on this element
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())
10. Subscription.status
Definition

The status of the subscription, which marks the server state for managing the subscription.

Control1..1
BindingThe codes SHALL be taken from SubscriptionStatusCodes The status of a subscription.

Typecode
Is Modifiertrue
Comments

A client can only submit subscription resources in the requested or off state. Only the server can move a subscription from requested to active, and then to error. Either the server or the client can turn a subscription off.

This element is labeled as a modifier because the status contains codes that mark the resource as not currently valid.

InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
11. Subscription.contact
Definition

Contact details for a human to contact about the subscription. The primary use of this for system administrator troubleshooting.

Control0..*
TypeContactPoint
InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
12. Subscription.end
Definition

The time for the server to turn the subscription off.

Control0..1
Typeinstant
Comments

The server is permitted to deviate from this time but should observe it.

InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
13. Subscription.reason
Definition

A description of why this subscription is defined.

Control1..1
Typestring
InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
14. Subscription.criteria
Definition

The rules that the server should use to determine when to generate notifications for this subscription.

Control1..1
Typestring
Must Supporttrue
Comments

The rules are search criteria (without the [base] part). Like Bundle.entry.request.url, it has no leading "/".

InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
15. Subscription.criteria.id
Definition

unique id for the element within a resource (for internal references)

Control0..1
Typestring
16. Subscription.criteria.extension
Definition

An Extension

Control0..*
TypeExtension
InvariantsDefined on this element
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())
SlicingThis element introduces a set of slices on Subscription.criteria.extension. The slices are unordered and Open, and can be differentiated using the following discriminators:
  • value @ url
17. Subscription.criteria.extension:filterCriteria
SliceNamefilterCriteria
Definition

Criteria for topic-based filtering (filter-by).

Control0..* This element is affected by the following invariants: ele-1
TypeExtension(BackportFilterCriteria) (Extension Type: string)
Must Supporttrue
InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children unless an empty Parameters resource (: hasValue() or (children().count() > id.count()) or $this is Parameters)
ext-1: Must have either extensions or value[x], not both (: extension.exists() != value.exists())
18. Subscription.criteria.value
Definition

The actual value

Control0..1
Typestring
Max Length1048576
19. Subscription.error
Definition

A record of the last error that occurred when the server processed a notification.

Control0..1
Typestring
InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
20. Subscription.channel
Definition

Details where to send notifications when resources are received that meet the criteria.

Control1..1
TypeBackboneElement
InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children unless an empty Parameters resource (: hasValue() or (children().count() > id.count()) or $this is Parameters)
21. Subscription.channel.id
Definition

Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

Control0..1
Typestring
22. Subscription.channel.extension
Definition

An Extension

Control0..*
TypeExtension
InvariantsDefined on this element
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())
SlicingThis element introduces a set of slices on Subscription.channel.extension. The slices are unordered and Open, and can be differentiated using the following discriminators:
  • value @ url
23. Subscription.channel.extension:heartbeatPeriod
SliceNameheartbeatPeriod
Definition

Interval in seconds to send 'heartbeat' notifications.

Control0..1 This element is affected by the following invariants: ele-1
TypeExtension(BackportHeartbeatPeriod) (Extension Type: unsignedInt)
InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children unless an empty Parameters resource (: hasValue() or (children().count() > id.count()) or $this is Parameters)
ext-1: Must have either extensions or value[x], not both (: extension.exists() != value.exists())
24. Subscription.channel.extension:timeout
SliceNametimeout
Definition

Timeout in seconds to attempt notification delivery.

Control0..1 This element is affected by the following invariants: ele-1
TypeExtension(BackportTimeout) (Extension Type: unsignedInt)
InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children unless an empty Parameters resource (: hasValue() or (children().count() > id.count()) or $this is Parameters)
ext-1: Must have either extensions or value[x], not both (: extension.exists() != value.exists())
25. Subscription.channel.extension:maxCount
SliceNamemaxCount
Definition

Maximum number of triggering resources included in notification bundles.

Control0..1 This element is affected by the following invariants: ele-1
TypeExtension(BackportMaxCount) (Extension Type: positiveInt)
InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children unless an empty Parameters resource (: hasValue() or (children().count() > id.count()) or $this is Parameters)
ext-1: Must have either extensions or value[x], not both (: extension.exists() != value.exists())
26. Subscription.channel.modifierExtension
Definition

May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained 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 can 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).

Control0..*
TypeExtension
Is Modifiertrue
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 Namesextensions, user content, modifiers
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.

InvariantsDefined on this element
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())
27. Subscription.channel.type
Definition

The type of channel to send notifications on.

Control1..1
BindingThe codes SHALL be taken from SubscriptionChannelType The type of method used to execute a subscription.

Typecode
InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
28. Subscription.channel.type.id
Definition

unique id for the element within a resource (for internal references)

Control0..1
Typestring
29. Subscription.channel.type.extension
Definition

An Extension

Control0..*
TypeExtension
InvariantsDefined on this element
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())
SlicingThis element introduces a set of slices on Subscription.channel.type.extension. The slices are unordered and Open, and can be differentiated using the following discriminators:
  • value @ url
30. Subscription.channel.type.extension:customChannelType
SliceNamecustomChannelType
Definition

Additional channel types not defined in FHIR R4.

Control0..1 This element is affected by the following invariants: ele-1
TypeExtension(BackportChannelType) (Extension Type: Coding)
Must Supporttrue
InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children unless an empty Parameters resource (: hasValue() or (children().count() > id.count()) or $this is Parameters)
ext-1: Must have either extensions or value[x], not both (: extension.exists() != value.exists())
31. Subscription.channel.type.value
Definition

Primitive value for code

Control0..1
Typecode
32. Subscription.channel.endpoint
Definition

The url that describes the actual end-point to send messages to.

Control0..1
Typeurl
Comments

For rest-hook, and websocket, the end-point must be an http: or https: URL; for email, a mailto: url, for sms, a tel: url, and for message the endpoint can be in any form of url the server understands (usually, http: or mllp:). The URI is allowed to be relative; in which case, it is relative to the server end-point (since there may be more than one, clients should avoid using relative URIs).

InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
33. Subscription.channel.payload
Definition

The mime type to send the payload in - either application/fhir+xml, or application/fhir+json. If the payload is not present, then there is no payload in the notification, just a notification. The mime type "text/plain" may also be used for Email and SMS subscriptions.

Control1..1
BindingThe codes SHALL be taken from Mime Types BCP 13 (RFCs 2045, 2046, 2047, 4288, 4289 and 2049)

Typecode
Comments

Sending the payload has obvious security implications. The server is responsible for ensuring that the content is appropriately secured.

InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
34. Subscription.channel.payload.id
Definition

unique id for the element within a resource (for internal references)

Control0..1
Typestring
35. Subscription.channel.payload.extension
Definition

An Extension

Control1..*
TypeExtension
InvariantsDefined on this element
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())
SlicingThis element introduces a set of slices on Subscription.channel.payload.extension. The slices are unordered and Open, and can be differentiated using the following discriminators:
  • value @ url
36. Subscription.channel.payload.extension:content
SliceNamecontent
Definition

How much of the resource content to deliver in the notification payload. The choices are an empty payload, only the resource id, or the full resource content.

Control1..1 This element is affected by the following invariants: ele-1
TypeExtension(BackportPayloadContent) (Extension Type: code)
Must Supporttrue
InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children unless an empty Parameters resource (: hasValue() or (children().count() > id.count()) or $this is Parameters)
ext-1: Must have either extensions or value[x], not both (: extension.exists() != value.exists())
37. Subscription.channel.payload.value
Definition

Primitive value for code

Control0..1
Typecode
38. Subscription.channel.header
Definition

Additional headers / information to send as part of the notification.

Control0..*
Typestring
Comments

Exactly what these mean depend on the channel type. They can convey additional information to the recipient and/or meet security requirements; for example, support of multiple headers in the outgoing notifications for rest-hook type subscriptions.

InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))