19. The method of claim 17 , further comprising storing a plurality of facet-value pairs associated with the plurality of objects, wherein each of a plurality of values has an association with at least one of a plurality of facets characterizing the objects.
19. The method of claim 17 , further comprising storing a plurality of facet-value pairs associated with the plurality of objects, wherein each of a plurality of values has an association with at least one of a plurality of facets characterizing the objects. 28. The method of claim 19 , wherein a first facet-value pair is associated with the second set of objects and a second facet-value pair is associated with the third set of objects, and wherein the value of the first facet-value pair is a parent of the value of the second facet-value pair.