Conversely, if the content of the global navigation bar is inferred by the landmark specifications, the model does not need to be updated after a change of visibility of pages and areas. If the navigation commands are explicitly listed in the navigation bar, a change in the visibility of areas and pages requires updating the model. Moreover, the implicit representation supported by landmark is also more resilient to changes in the model. This way of modeling is practical in web application specification, in which the lack of a top-level ViewContainer would force the designer to replicate the same navigation bar in all the pages. It is left to the implementation (e.g., to a code generator) to insert the navigation menu with appropriate navigation commands wherever it is appropriate according to the landmark visibility rules. In this way, an explicit toolbar does not need to be modeled for the purpose. Such a ViewContainer is again implicitly nested within all the ViewContainers where the landmark is visible. When a ViewContainer is tagged as landmark, a navigation link to it is considered part of an implicit navigation menu ViewContainer. The first way, discussed in chapters 4 and 7 Chapter 4 Chapter 7, is implicit through the concept of landmark. In IFML, content-independent navigation menus can be modeled in two ways. For this reason, they are often called navigation menus or bars. They group commands that do not act upon specific objects but shortcut the navigation or help the user go back quickly to the most important view elements, possibly from a deeply nested part of the interface. Marco Brambilla, Piero Fraternali, in Interaction Flow Modeling Language, 2015 8.2.1.6 PATTERN CN-CIM&B: Content-independent navigation bars and menusĬontent-independent toolbars, although apparently similar in the rendition to their content-dependent counterparts, express quite a distinct aspect of the interface.
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