4. The method recited in claim 3, wherein said description includes nodes within each of the regions.
4. The method recited in claim 3, wherein said description includes nodes within each of the regions. 7. The method of claim 4, 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.