An attribute can be part of number slices. Each entity has a distinguished slice, called the entity's head , that is to be used as a default entry point for incoming access constructs. Figure 4 shows a partial slice design for the Faculty entity as it appears in the slice design context Figure 4. Slice design context. This context helps developers specify the navigational features of an application.
Designers specify menu-like structures using groupings, indices, and guided tours.
Designers also decide here what relationships will be navigable in the final application. The diagram appearing in Figure 5 is an RMD diagram, which models access paths. Presentation is the opening screen, from which a Faculty and Courses indices are reachable. When activated, these facilities automatically generate a web of nodes and links. Facilities to manipulate the node-link web itself.