3. The method of claim 1 wherein the content item N is a document, a sub-document, a collection of documents, a collection of sub-documents, a database record, a database object, a collection of database records, or a collection of database objects; and wherein database records or objects are drawn from one or more databases or one or more database views.
5. The method of claim 3 , wherein the content hierarchy C corresponds to a Web page; and wherein the method further comprises displaying N by itself according to a layout stipulated for N in the Web page, in response to determining the topical relevance of N for the concept to be greater than a threshold.