afs:pager gives access to reply pages surrounding the current page, when any. afs:pager is only available in the reply set when all the replies cannot fit in the current page, which means that there is at least another reply page.
afs:pager has the following attributes:
When the reply set contains other pages, afs:pager has a list of afs:page child element. It affords building a window of reachable pages surrounding the current page — usually the next nine pages for the first page, or the five pages before and after the current page in the middle of the reply set. Each afs:page element is of type integer, and holds the corresponding page number.