Automatic master pages

Hi,

Is it possible to have different master page for first page and selected pair of left/right master pages for the rest of elements. So, something like:

element X starts a page sequence (X_first page, X_left/X_right..)

element Y starts a page sequence (Y_first_page, Y_left/Y_right..)

i can get 1. page different with "single" span in StructMasterPageMap and rest of the pages with default left/right master paging, but not with specific left/right pairs.

BR, Martti