Datatype Packages
A data model is used to represent the static structure of a system, particularly the types of objects manipulated in the system, their internal structure, and the relationships between them. A data model is a set of entities with their attributes, the associations existing between these entities, the constraints bearing on these entities and associations, etc.
A datatype is used to group characteristics shared by several attributes. Data types are implemented as classes.
A datatype package is a reference package owning all or part of the datatypes used in the enterprise. All the other packages are declared as clients of the reference package of datatypes.
A type is used to group characteristics shared by several attributes.
To type attributes of an entity, only datatypes defined for the data model that contains this entity are proposed.
When you create a data model, the "Datatype Reference" datatype package is automatically associated with it by default.
Ths "Datatype Reference" package owns datatypes "Address", "Code", "Date", etc.
Opening the explorer on this datatype package, you can see that is is referenced by several data models.
The attributes of entities of these models can therefore be typed using the datatypes “Address”, “Code”, “Date”, etc.
