2.1 Modeling Elements For the construction of the navigation model a set of stereotypes are defined to
support a more intuitive modeling of the Web application. The stereotyped classes are the «navigation class» and a set of access elements, such as «index«query» and «menu», which are introduced and semantically explained in [BKM99,HK00]. The directed associations expresses «direct navigabilitydefines the well-formedness rules of the navigation modeling elements in terms of a metamodel. The class names occurring in this metamodel (with exception of the abstract class access element) will be used as stereotypes when concrete navigation models are constructed. For instance, a particular index class can be defined as depicted in Figure 3 (left). For this we will often use the icon notation shown in Figure 3 (right).