One common operation performed with resources is to gather a collection of resources into a single instance with containing context. In FHIR this is referred to as "bundling" the resources together. These resource bundles are useful for a variety of different reasons, including: - Returning a set of resources that meet some criteria as part of a server operation (see RESTful Search) - Returning a set of versions of resources as part of the history operation on a server (see History) - Sending a set of resources as part of a message exchange (see Messaging) - Grouping a self-contained set of resources to act as an exchangeable and persistable collection with clinical integrity - e.g. a clinical document (see Documents) - Creating/updating/deleting a set of resources on a server as a single operation (including doing so as a single atomic transaction) (see Transactions) - Storing a collection of resources http://hl7.org/fhir/R4/bundle.html