fo:basic-page-sequence

According to the XSL spec,

A basic-page-sequence holds:

     a number of child simple-page-masters that define 
     the layouts to be used for this sequence.

     a number of child queues which hold the content 
     to be placed in this sequence.

However, there is an example earlier in the spec that indicates that
fo:basic-page-sequence may directly contain fo:block elements. Which is
correct?  What, exactly can a fo:basic-page-sequence contain?

Furthermore, the spec states:

     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.

Does this mean that fo:basic-page-sequence elements can nest?  Is it
true and that the root element of an FO file must be
fo:basic-page-sequence?

Finally, one meta question: how solid is the formatting object part of
the spec as it stands, incomplete though it is?  How dramatically is
this likely to change in the future?

--
Elliotte Rusty Harold


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