The logical data model consists mainly of logical entities and these are modeled as classes based on UML. A class in UML consists of:

• A class name and explanation


• Attributes of which we at least keep track of the name, the data type and the cardinality (the datatype can also be a different class, an enumeration or an interface)


• The associations, these can be all UML allowed associations but in the base they are the normal associations, specialization and aggregation (be careful with too many association types in data modeling)

In addition to the logical entities, enumerations can be used for the use of domains with attributes. In that case, the data type of the attribute is the enumeration.

Complex data types can be used for complex models. These are explained in more detail in the example and include a breakdown of generic structures for a simpler manageable model

Version	I,S
Created date	08-02-2018

This is the class in UML and describes the logical structure of the relevant entities in the logical model based on attributes and associations

Author	Bert Dingemans
Alias	--
Stereotypes	--
Details of Logical entity

Enumerations define domains for attributes, which can later be used in code and database generation for checks, checks and the user interface

Author	Bert Dingemans
Alias	--
Stereotypes	--
Details of Enumeration

Used to use generic structures that are then linked to an attribute of a logical entity.

For example, an address always has a street, house number, zip code and town. This is a complex data type that can then be used for all address attributes.

Author	Bert Dingemans
Alias	--
Stereotypes	--
Details of Complex Datatype