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Subject: Re: Special meeting to discuss NDR VER8 and VER9

A meeting was held 2005.04.08 to discuss the versioning problem.


   Jon Bosak
   Tony Coates
   Stephen Green
   Arofan Gregory
   Eduardo Gutentag
   Anne Hendry
   Sylvia Webb


 - There is a real problem here that is independent of schema
   generation (i.e., it would exist even if the changes were made
   by hand)

 - The problem arises when changes are made simultaneously to two
   or more items sharing the same namespace

 - The suggestion to limit minor version changes to XSD extension
   doesn't solve the problem

 - If we can't figure out a way around this then we will have to
   abandon polymorphism within the limits of XSD as a goal


   An ad-hoc team composed of Arofan, Stephen, Tony, and David
   Kruppke will work over the next two weeks to analyze this
   problem in detail and recommend a solution.  All other
   interested TC members are invited to participate.

   Key questions:

    - Is it possible to preserve polymorphism?

       - If so, how?

       - If not, what do we recommend instead?  (The default is
         redeclaration of the whole set.)

    - In either case, what changes need to be made to the NDRs and
      the Customization Guidelines?

   The team will hold phone meetings from 18h00-20h00 Central
   European time (17h00-19h00 in the UK) on 4/12 (Tuesday), 4/15
   (Friday), 4/18 (Monday), and 4/19 (Tuesday) using the usual UBL
   conference bridge. (Subcommittee chairs: please notify me ASAP
   if this conflicts with any of your scheduled calls and we will
   switch to an alternative number for these sessions.)

   Email will be used to exchange examples.  To ensure the widest
   possible participation, mail on this subject will use the TC
   mailing list.  All messages in this thread will begin with
   "[ver]" to distinguish them from other mail.  Arofan will be
   copied on all such mail by including the address
   "ilg21@yahoo.com" on the cc line.

   Initial action: Arofan to review the examples posted earlier by
   Stephen at



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