Formatting Objects

My work is to render documents in print.
Elsag S.p.a. would to use XML+XSL.
I'm interested in 'formatting object'.
I have a question: the final output that utilizes 'FO' should be already structured in page (Is this right?). Who and how decides page breaks?

Will they be features that will be implemented in the next working draft?

For example: if I have a paragraph at the end of a page, how may I mean if it must be divided between two pages?

Best regards.