1. A computerized search and presentation method for a set of items, comprising: assigning one or more Attributes to each item in the set of items; further assigning to each Attribute, and to no item, a single Kind; creating assignments between Attributes and Kinds, where the assignments assign to each Attribute a single Kind, and to each Kind an arbitrary number of Attributes; assigning to each Kind at least one scheme of transitive implications among the Attributes such that each Kind is associated with several Attributes; determining which Attributes of each Kind are broad Attributes, broad Attributes being Attributes that do not within the set of items imply any other Attribute; presenting to a user a list of Kinds by which the set of items are to be grouped; upon accepting the user's selection of one or more Kinds, listing one or more broad Attributes of that Kind; upon accepting the user's selection of one or more broad Attributes, presenting information about a subset of items having the selected one or more broad Attributes; wherein Kinds are not assigned to items.
1. A computerized search and presentation method for a set of items, comprising: assigning one or more Attributes to each item in the set of items; further assigning to each Attribute, and to no item, a single Kind; creating assignments between Attributes and Kinds, where the assignments assign to each Attribute a single Kind, and to each Kind an arbitrary number of Attributes; assigning to each Kind at least one scheme of transitive implications among the Attributes such that each Kind is associated with several Attributes; determining which Attributes of each Kind are broad Attributes, broad Attributes being Attributes that do not within the set of items imply any other Attribute; presenting to a user a list of Kinds by which the set of items are to be grouped; upon accepting the user's selection of one or more Kinds, listing one or more broad Attributes of that Kind; upon accepting the user's selection of one or more broad Attributes, presenting information about a subset of items having the selected one or more broad Attributes; wherein Kinds are not assigned to items. 11. The method of claim 1 , wherein graphical means are provided by which the user may specify the presence or absence of a particular Attribute or Kind as conditions constraining what items may belong to the set of items.