|The idea of faceted
browse is to allow the user to continually narrow the focus along several
defined axes, each of which is a hierarchy.
An item is defined by several facets...e.g. location, material, time
period....and they can be browsed as a whole, not separately.
|As the user drills
down, the display keeps track of what terms have been chosen, and offers
further refinement into each facet.
The chosen terms can be removed in any order, so navigation within the
faceted hierarchy is fluid.
|There are numerous
examples of full or partial implementation of this out in the world...Endeca