27. The computer-readable medium of claim 24, wherein said description includes a first set of nodes that are each associated with: at least one region from said regions, and selection criteria; and the step of selecting source text includes selecting a first node from said first set of nodes based on whether selection criteria associated with said first node is satisfied.
29. The computer-readable medium recited in claim 27, in which the step of receiving a request further includes the step of receiving a request from the client, wherein the request includes a value of TRUE specified for a "selective" parameter.