Abstract: Systems and a method are described. The method includes identifying and presenting a plurality of data items comprised of receiving a selection that identifies a parent category; identifying a first plurality of categories based on the parent category, the first plurality of categories including a first category, the plurality of data items not being user-classifiable under the first plurality of categories; identifying the plurality of data items based on a link from the first category to a second category, the second category being included in a second plurality of categories that are respectively associated with the first plurality of categories, the plurality of data items being user-classified under the second category; and communicating, over a network, a user interface response to the receiving the selection, the user interface including the plurality of data items.

Abstract: Articles of manufacture and methods are described. Specifically, the methods include constructing category structures within a database, classifying a data item within a database, and facilitating location of a data item within a database are described. A first method includes defining, in a database, a first structure of categories and an alternative second structure of categories to provide an alternative classification of a data item. A second method includes classifying a data item in a first hierarchy of categories and a second alternative hierarchy of categories. A third method includes locating a data item responsive to identifying of a link between a first hierarchy of categories and a second alternative hierarchy of categories.

Abstract: Articles of manufacture and methods are described. Specifically, the methods include constructing category structures within a database, classifying a data item within a database, and facilitating location of a data item within a database are described. A first method includes defining, in a database, a first structure of categories and an alternative second structure of categories to provide an alternative classification of a data item. A second method includes classifying a data item in a first hierarchy of categories and a second alternative hierarchy of categories. A third method includes locating a data item responsive to identifying of a link between a first hierarchy of categories and a second alternative hierarchy of categories.

Abstract: A method of facilitating location of a data item describing, for example, a product or service that is the subject of on-line auction, commences with the presentation of a category navigation interface. The category navigation interface allows a user to navigate a “virtual” hierarchy of categories and to select a target virtual category of the virtual hierarchy. The target virtual category is then identified as being linked to an actual category, within an actual hierarchy of categories. Database items are classified only in terms of the real hierarchy of categories, and not the virtual hierarchy of categories. Having then identified an actual category to which the virtual category is mapped, data items of the real category are identified responsive to the user selection of the virtual category of the virtual hierarchy of categories.

Abstract: A method of facilitating location of a data item describing, for example, a product or service that is the subject of on-line auction, commences with the presentation of a category navigation interface. The category navigation interface allows a user to navigate a “virtual” hierarchy of categories and to select a target virtual category of the virtual hierarchy. The target virtual category is then identified as being linked to an actual category, within an actual hierarchy of categories. Database items are classified only in terms of the real hierarchy of categories, and not the virtual hierarchy of categories. Having then identified an actual category to which the virtual category is mapped, data items of the real category are identified responsive to the user selection of the virtual category of the virtual hierarchy of categories.