1. Database Design With Semantic Object Models
Transformation of Semantic Objects into Relational Database Designs
Sample Objects

2. Seven Types of Semantic Objects
Simple Objects
Single relation. Fig. 7-2,1
Composite Objects
One relation for the object and another relation for each multivalued attribute. The key of these relations is the composite of the identifier of the object plus the identifier of the group. Fig. 7-3,4
Compound Objects
The relationships (1:1, 1:N, N:M) between objects need to be considered.

3. Semantic Objects Into Relations (Cont.)
1:1 Compound Objects
One relation is needed for each object. Relations are associated by placing the key of either relation as a foreign key in the other relation. Fig. 7-6,7
1:N and N:1 Compound Objects
Each object is represented with a relation and the key of the parent is place in the child. Fig. 7-8,9
N:M Compound Objects
One relation is needed for each object and a third one to be the intersection relation. Fig. 7-10,11

4. Semantic Objects Into Relations (Cont.)
Hybrid Objects
Transformed into relations using a combination of the techniques for composite and compound objects. Fig.7-12,13,14
Association Objects
Use a relation for each of the three associated objects, and then represent the relationships among the objects using the strategies used with compound objects. Fig. 7-15,16

5. Semantic Objects Into Relations (Cont.)
Supertype (Parent) /Subtype Objects
Define a relation for the parent object and one for each of the subtype objects. The key of all these relations in the key of the parent. Fig. 7-17,18
Archetype/Version Objects
These are compound objects that model various instances of the basic object e.g. releases of software products. Fig. 7-19,20

6. Sample Objects Subscription Form -> Fig. 7-21
Product Description -> Fig. 7-22
Traffic-Warning Citation -> Fig. 7-23