entity_def.schema_def
This is the schema in which the entity is defined.
Defines a foreign key to table schema_def.
source_s (FSK, M: CHAR VARYING(19))
entity_def.source
The source for this entity, for example Epicentre V2.0.
Defines a foreign key to table source.
ref_type_code (O: CHAR(1))
entity_def.ref_type_code
Ref_type_code is NULL for non-reference entities and contains "O", "F", "L" for Open, Fixed or Local reference entities respectively.