IBM SG24-7368-00 manual Level 1 model organization

At level 1, the structure becomes a little more complicated (Figure 6-2). At the top, there is a package for Level 1 and then immediately below that, any grand context diagrams or grand use case diagrams created at this level. These two diagrams show all or some of the level's logical elements and use cases, respectively, and are optionally created if they add clarity to the model. If a locality diagram is used at this level, it can be included here as well.

	Project
	Level 1
Grand	Grand Use
Context Diagram	Case Diagram
Locality Diagram

These are

operations of the

Level 0 logical

element, which is

the Enterprise

Level 0	Level 1 Logical
	Elements
Operation
Realizations	L1 Logical
	Element “Z”
L0 Operation “C”	Context Diagram
WB Exp	Use Case
Seq Diagram	Diagram
L0 Operation “D”	Joint Realization
	Diagram(s)
WB Exp	L1 Logical
Seq Diagram	Element “Y”

Figure 6-2 Level 1 model organization

At level 1 and beyond, we create two sets of packages for the remaining model elements. One holds the level 0 operation realizations, that is, the realization of each level 0 operation. There is a package for each level 0 operation, containing the white-box sequence diagrams for all scenarios of this operation. These items serve to expresses the realization of this operation.

The other category (level 1 logical elements) contains a package for each logical element at level 1. These elements were determined in the process of doing the realizations of the level 0 operations. In each element package, you will see a context diagram for this element, a corresponding optional use case diagram and any joint realization diagrams.

96Model Driven Systems Development with Rational Products