The subscription resource describes a particular client's request to be notified about a SubscriptionTopic. The subscription resource describes a particular client's request to be notified about a SubscriptionTopic. If the element is present, it must have either a @value, an @id, or extensions A formal identifier that is used to identify this code system when it is represented in other formats, or referenced in a specification, model, design or an instance. A natural language name identifying the subscription. The status of the subscription, which marks the server state for managing the subscription. The reference to the subscription topic to be notified about. Contact details for a human to contact about the subscription. The primary use of this for system administrator troubleshooting. The time for the server to turn the subscription off. Entity with authorization to communicate with the server about this Subscription, such as requesting changes (e.g., updating an endpoint URL). A description of why this subscription is defined. The filter properties to be applied to narrow the subscription topic stream. When multiple filters are applied, evaluates to true if all the conditions applicable to that resource are met; otherwise it returns false (i.e., logical AND). The type of channel to send notifications on. Channel-specific URL that describes where notifications are sent. Channel-dependent information to send as part of the notification (e.g., HTTP Headers). If present, a 'heartbeat' notification (keep-alive) is sent via this channel with an interval period equal to this elements integer value in seconds. If not present, a heartbeat notification is not sent. If present, the maximum amount of time a server will allow before failing a notification attempt. The MIME type to send the payload in - e.g., `application/fhir+xml` or `application/fhir+json`. Note that: * clients may request notifications in a specific FHIR version by using the [FHIR Version Parameter](http.html#version-parameter) - e.g., `application/fhir+json; fhirVersion=4.0`. * additional MIME types can be allowed by channels - e.g., `text/plain` and `text/html` are defined by the Email channel. How much resource content to deliver in the notification payloads. The choices are an empty payload, only the resource id, or the full resource content. If present, the maximum number of events that will be included in a notification bundle. Note that this is not a strict limit on the number of entries in a bundle, as dependent resources can be included. The subscription resource describes a particular client's request to be notified about a SubscriptionTopic. A resource listed in the `SubscriptionTopic` this `Subscription` references (`SubscriptionTopic.canFilterBy.resource`). This element can be used to differentiate filters for topics that include more than one resource type. The filter as defined in the `SubscriptionTopic.canFilterBy.filterParameter` element. Comparator applied to this filter parameter. Modifier applied to this filter parameter. The literal value or resource path as is legal in search - for example, `Patient/123` or `le1950`. An event filter to be applied to the topic - e.g., if a topic defined multiple event triggers, this can be used to specify a single one. Multiple values are or-joined, multiple codings within a value are and-joined. The subscription resource describes a particular client's request to be notified about a SubscriptionTopic. Parameter name for information passed to the channel for notifications, for example in the case of a REST hook wanting to pass through an authorization header, the name would be Authorization. Parameter value for information passed to the channel for notifications, for example in the case of a REST hook wanting to pass through an authorization header, the value would be `Bearer 0193...`. Empty Id-only Full-resource If the element is present, it must have either a @value, an @id, or extensions Requested Active Error Off Entered in Error If the element is present, it must have either a @value, an @id, or extensions Missing Exact Contains Not Text In Not In Below Above Type Identifier Of Type Code Text Text Advanced Iterate If the element is present, it must have either a @value, an @id, or extensions