overlapping fo:region-before and fo:region-body

i have the problem to create a content-dependant table in region-body,
not knowing how many rows ( positions of a bill) are coming.
how do i achieve a table frame, that has a bottom line always at the
bottom of region-body, and not led end the table after the last position
of my bill ?
i found a solution where in region-before the fixed table (e.g. one row that
spans
over 15cm and has borders) is defined in region-before, and the
content-dependant
table with variable count of rows in region -body.
by letting them overlap (margin-top of region-body less than region-before)
they achieved a fixed-layout of the table.
a similar solution i found for retrieve-marker statements, which have to be
placed
in region-before or region-after. if they have to be located in region-body
(e.g.
first or last row of a table) this can also be achieved by overlapping the
regions.

my question : how do you think about this solution and do you know any other
possibilities to achieve the two mentioned effects ?

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