48. The method of claim 46 , wherein the presentation organizes the navigation options by more general attribute-value pairs.
46. The method of claim 9 , wherein navigation options include a presentation of a set of lists of attribute-value pairs, each list corresponding to one of the attributes, some lists including attribute-value pairs that refine the attribute-value pairs corresponding to the current navigation state and some lists including attribute value pairs that are incomparable to the attribute-value pairs corresponding to the current navigation state.