http://hl7.org/fhir/StructureDefinition/Basic|4.0.1

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.
NameFlagsCardTypeDescription & Constraints
Basic
0..*Resource for non-supported content
 
identifier
Σ
0..*IdentifierBusiness identifier
 
code *
?!Σ
1..1CodeableConceptKind of Resource BasicResourceType (example)
 
subject
Σ
0..1ReferenceIdentifies the focus of this resource
 
created
Σ
0..1dateWhen created
 
author
Σ
0..1ReferenceWho created