Abstract: An article transport vehicle (200) has: a carrier base (202) configured for movement along a guideway and a pair of gripping arms (216), each gripping arm (216) having a first end (216a) connected to the carrier base (202) and a second end (216b) protruding from the carrier base (202). The pair of gripping arms (216) is movable between a closed position configured for holding an article (302) and an open position configured for releasing the article (302). The article transport vehicle (200) further has a closure mechanism (238) for moving the pair of gripping arms (216) between the closed position and the open position. The closure mechanism (238) is configured for biasing the pair of gripping arms (216) to the closed position and moving the pair of gripping arms (216) to the open position when the carrier base (202) is positioned at a predetermined portion of the guideway.

Abstract: Hierarchical data may be provided. First, first data may be received corresponding to a first item. The first item may correspond, for example, to a web site. Next, a first cache may be created corresponding to an ancestry of the first item. In creating the first cache, information may be included configured to define a hierarchy of the first item. The first item may correspond to a child web site and the information in the cache may correspond to a plurality of parent web sites higher in the hierarchy and being related to the child web site. The first cache may include the plurality of parent web sites in a parent-relative fashion. Then, the received first data corresponding to the first item may be stored in a database. In addition, the first cache may be stored in the database as a property of the stored first item.

Abstract: Hierarchical data may be provided. First, first data may be received corresponding to a first item. The first item may correspond, for example, to a web site. Next, a first cache may be created corresponding to an ancestry of the first item. In creating the first cache, information may be included configured to define a hierarchy of the first item. The first item may correspond to a child web site and the information in the cache may correspond to a plurality of parent web sites higher in the hierarchy and being related to the child web site. The first cache may include the plurality of parent web sites in a parent-relative fashion. Then, the received first data corresponding to the first item may be stored in a database. In addition, the first cache may be stored in the database as a property of the stored first item.