question about how to "expand" nested references in a bookmap

["Grosso, Paul" <pgrosso@ptc.com>]

We've come across some bookmaps where some users are
expecting one thing and some are expecting another in
terms of how references expand in terms of nesting.

Does the DITA spec give an answer?  If not, does the TC
have an answer?

Here are two examples where each could be expanded in
(at least) two different ways:

Starting with a bookmap document:

   bookmap
      part  href=conceptA
      part  href=conceptB
      . . .
   /bookmap

where conceptA includes two nested topics:

   conceptA
      body
      conceptC
          body
      conceptD
          body
   /conceptA

How should these references get resolved?

Option #1: 

   RDS
      bookmap
         part as conceptA
            body for conceptA
            chapter for conceptC
               body for conceptC
            chapter for conceptD
                body for conceptD
         part as conceptB
             body for conceptB
         . . . 

Option #2:  

   RDS
        bookmap
           part as conceptA
              body for conceptA
              conceptC
                 body for conceptC
              conceptD
                 body for conceptD
            part as conceptB
                 body for conceptB
            . . .

(or something else).

Here is another example:

   bookmap
      chapter   href=mapA  format=ditamap
   MapA
       topicref  href=conceptE
       topicref  href=conceptF
       topicref  href=conceptG

How should these references get resolved?

Option #1:

   RDS
      Bookmap
         conceptE
         conceptF
         conceptG

or Option #2:

   RDS
       bookmap
          chapter for conceptE
          chapter for conceptF
          chapter for conceptG

(or something else).

paul