A druid can be thought of as having a page that starts the sequence, one or more pages that end the sequences (there can be multiple end pages if the flow of pages diverges at some point) and some pages that are in between the start and end pages.

The Gnome.DruidPageEdge widget is for the first and last pages in a druid's sequence of pages. Pages in the "middle" of a sequence should use Gnome.DruidPageStandard.