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. 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. If the element is present, it must have either a @value, an @id, or extensions 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. Identifies the patient, practitioner, device or any other resource that is the "focus" of this resource. Identifies when the resource was first created. Indicates who was responsible for creating the resource instance.