Iteration

I'd like to generate multiple copies of the same PDF page, depending on the
value of an attribute of an element in the XML document.
I haven't found any XSL-FO tags for expressing such an iteration; does
anybody know how to implement this?


< item number_of_copies="6" >
    < sub-item >
        ...
    < /sub-item >
< /item >

THANK YOU.
Gianluca Gaiotto