(57) A window or door frame structure (3), such as for a roof window, said frame structure
(3) comprising, at a side (3a) facing inwards in the mounted position of the window
or door assembly, at least one at least partially circumferential groove (7) adapted
for receiving a end portion (8) of a lining structure (2), wherein said groove (7)
in at least a part of its longitudinal extension has a cross sectional surface profile
having at least two sections (9a, 9b), each said section (9a, 9b) having a substantially
rectangular shape.
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