Basic is used for handling concepts not yet defined in FHIR, narrative-only resources that don't map to an existing resource, and custom resources not appropriate for inclusion in the FHIR specification.

Need some way to safely (without breaking interoperability) allow implementers to exchange content not supported by the initial set of declared resources.

Identifier assigned to the resource for business purposes, outside the context of FHIR.

Identifies the 'type' of resource - equivalent to the resource name for other resources.

Must be able to distinguish different types of "basic" resources.

Because resource references will only be able to indicate 'Basic', the type of reference will need to be specified in a Profile identified as part of the resource. Refer to the resource notes section for information on appropriate terminologies for this code.

Identifies the patient, practitioner, device or any other resource that is the "focus" of this resource.

Needed for partitioning the resource by Patient.

Optional as not all resources potential resources will have subjects. Resources associated with multiple subjects can handle this via extension.

Indicates who was responsible for creating the resource instance.

Needed for partitioning the resource.

Identifies when the resource was first created.

Allows ordering resource instances by time.