Classification and Assembly Structures
Once classes and objects have been identified now the analyst begins to focus on classification structure. Each objects is considered as a generalization then as a specialization . that is the instances of an object are defined and named.
Specialization is an entity set which may include sub grouping of entities that are distinct in some way from other entities in the set. Whereas in the generalization, multiple entity sets are synthesized into a higher level entity set on the basis of common features.
To illustrate them consider an example shown diagrammatically in fig
In the fig above, the generalization class A is further refined into a set of specializations that are B, C, and D. The attributes and operation of class A are inherited by the specialization of the class.
Consider an another example of generalization specialization . let a class person is an entity set with the following attributes name street and city.
According to specialities person may be further classified as customer and employee. These two classes ( entity sets) include all the attributes of entity set person and some more additional attributes. The additional attributes of customer is customer id and of employee id and salary. This example is illustrated in fig below,
So it can be seen from the fig above, that entity sets customer and employee synthesize the common features of entity set person and also their own ones.
In some other type of cases, an objects represented in the initial model can actually be composed of a numbers of components parts ( objects only) . structures of this type are called as assembly structures. They are shown in fig below
This diamond implies an assembly relationship. The cardinality can also be shown on the connecting lines.
Structure representation provides the analyst with a means for partitioning the CRC model. At last the model should be reviewed properly.
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