6. The method of claim 1 wherein the content items are Web pages and wherein automatically building the index includes: operating a Web crawler to locate and process a plurality of Web pages; during processing of each Web page, determining whether a particular grouping label of the plurality of grouping labels is included in said each Web page; and in response to determining that the particular grouping label is included in the Web page, adding information about the particular grouping label for each Web page to a page index.
22. A computer-readable storage medium carrying one or more sequences of instructions which, when executed by one or more processors, causes the one or more processors to perform the method recited in claim 6 .