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Semantic-Based Navigation in Open Spaces 279
In practice, users can easily select the desired information by accessing one or more
facets available in the used faceted classification and selecting one or more restrictions in
those facets. Users actually create faceted queries by navigating and selecting metadata (i.e.,
facets and restrictions respectively), thus specifying the data (i.e., results) that should be
retrieved (see Figure 10-7).
Figure 10-7. The faceted navigation model provides effective access to information via navigation
in multiple metadata views (facets) whose combination describes the global browsing state.
This effectively translates into multidimensional hierarchical navigation in metadata describing
a particular information domain or, in graph terms, simultaneous navigation in
multiple tree hierarchies (i.e., a forest) as individual facets are often hierarchically organized.
The combined navigation state from all facets then defines the global navigation
state and the presentation window, which shows the faceted query results.