Marking a dimension value as inert (or non-navigable) indicates that the dimension value should not be included in any navigation state, although it can be displayed in a user interface to help guide the end-user toward a selection.
When a user selects an inert dimension value, the navigation state is not changed, but the children of the dimension value are displayed for selection.
For example, if a Wineries dimension contains 1000 wineries and there is no geographic information from which to create a meaningful hierarchy, you can create a non-navigable alphabetical hierarchy. The first set of refinements returned for the Winery dimension would be the non-navigable refinements (such as A, B, C, and so on). When a user selects 'A,' the resulting query returns the same record set but the winery refinements are limited to those wineries whose name begins with A.
To make a dimension value non-navigable:
Fully implementing this feature requires additional work outside of Developer Studio. Please refer to the Endeca Basic Development Guide for details.