6. The method of claim 5 wherein said plurality of elements associated with said new category name comprises, in a given element, a value indicating a quantity of elements in said plurality of elements associated with said new category name.
5. The method of claim 1 wherein said receiving a user search request comprises receiving an indication of a category to be searched as a selection from a master list of categories and further comprising adding a category to said master list of categories by: receiving a new category name; associating a plurality of elements with said new category name, said plurality of elements being derived in accordance with said second mapping function; and adding a reference to said new category name to said master list of categories.