In contrast to an entity-relationship diagram that represents the design of a database, an RMDM diagram describes how users will navigate a hypermedia application. To avoid cluttering, slices are not included in Figure 2, and only key attributes of entities are shown. Rapid transitions between methodological stages are supported in RMCase via navigation among contexts. An entity is a conceptual element from the application domain, characterized by a set of attributes. An attribute represents a unit of information.
Attributes have a name and type and are always associated with a unique entity or relationship.
A relationship is a conceptual tie among two or more entities. Relationships can also contain attributes. The entities Faculty and Courses , and the relevant relationships are shown along with their attributes in Figure 3. The inner structure of an entity is designed in this context. A slice is a set of attributes belonging to a given entity.