This is the supertype of all reference entities. Reference entities contain standard instances of data as specified by POSC or another administering unit, which may be used to validate instances of Epicentre attributes.

Local rules:

Abstract supertype:
Each REF_DATA must be instantiated as one of its subtypes. These subtypes are: ref_code, ref_code_alias, ref_epicentre_version, ref_source, ref_source_reference

Entity replicated into subtype tables (@ref_data).

Referenced in Diagrams:

• HL1: High Level Model (0644)