orientation of pages in PDF

Hi,

A little question about orientation of pages in PDF.
I have documents with many sections, with different orientations (portrait/landscape). 
How fix the orientation of a section or a page into a FO or PDF document from docbook ?

Cordialement,

____________________________________________
Christopher COMPAGNON
AXA GROUP SOLUTIONS - Procurement, BI Supply
Département Solutions Business Intelligence
Domaine BI France - Reporting Opérationnel
(  01 44 45 04 16 (55 04 16) 
E-mail: 
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