Patent ID: 7421441

Claim:
A method for providing information from a corpus of content items to a client, the method comprising: defining a plurality of grouping labels, wherein each grouping label is includable by a plurality of publishers in a plurality of content items in a corpus; automatically building an index configured to identify, for each of the plurality of grouping labels, each of the content items in the corpus that includes that grouping label; wherein each grouping label corresponds to a group of affiliated publishers, and wherein the category identifiers corresponding to different ones of the grouping labels form a hierarchical taxonomy: building a directory of content items based on the hierarchical taxonomy of category identifiers, wherein each content item that has at least one grouping label included therein is listed in the directory under each category identifier that corresponds to one of the grouping labels included in that content item; receiving from a client a request for identification of content items related to a first content item, the request including a first one of the plurality of grouping labels extracted from the first content item; accessing the index to identify a second content item having the first one of the plurality of grouping labels included therein; and returning a reference to the second content item to the client.