Page groups are architected groups of one or more pages to which some action or meaning is assigned.
Consider the example of the bank statement application. Each bank statement in the print file comprises one or more pages. By grouping each statement in a logical manner, you can assign specific indexing or tag information to each group (statement). You can then use this grouping to perform actions such as archival, retrieval, viewing, preprocessing, postprocessing, and so on. The grouping also represents a natural hierarchy. In the case of OnDemand, you can locate a group of pages and then locate a page within a group. If you again use the example of the bank statement application, you can see how useful this can be. You can retrieve from the server all of the bank statements for a specific branch. You can then select a specific bank statement (group-level) to view and select a tagged summary page (page-level).