POSC Meta Model Specifications Version 2.3
Logical Data Model
ENTITY_DEF
(Rules)
(Express)
This holds the definition of entities.
name
(M, K: string(40))
The name of the entity.
is_abstract
(M: boolean)
This is TRUE (Y) if the entity is an ABSTRACT entity in the EXPRESS schema.
is_active
(M: boolean)
This is TRUE (Y) if the entity is part of the subset currently in use.
schema_def
(M:
schema_def
(entities))
This is the schema in which the entity is defined.
source
(M:
source
)
The source for this entity, for example Epicentre V2.0.
ref_type_code
(O: string(1) FIXED)
Ref_type_code is NULL for non-reference entities and contains "O", "F", "L" for Open, Fixed or Local reference entities respectively.
attributes
(V: SET[0:?]
attribute
(parent_ent))
These are the attributes that are defined for this entity. These do not include attributes inherited from supertypes of this entity.
diagram_set
(V: SET[0:?]
diagram_set
(entity_def))
The diagrams on which this entity appears.
Local rules:
Uniqueness Constraint
name
Entity projects as table
ENTITY_DEF
.
Referenced in Diagrams:
PJ1:Logical meta data
PJ3:Logical to Relational maps
PJ5:Subset meta data
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