Formatting objects question

What is the root element of the result tree when using the formatting
object vocabulary? I note:

"A document can contain multiple basic-page-sequences. For example, each
chapter of a document could be a separate basic-page-sequence; this would
allow the chapter title within a header or footer."

So "basic-page-sequence" seems not to be the right answer.
-- 
 Paul Prescod  - ISOGEN Consulting Engineer speaking for only himself
 http://itrc.uwaterloo.ca/~papresco

"Remember, Ginger Rogers did everything that Fred Astaire did,
but she did it backwards and in high heels."
                                               --Faith Whittlesey


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