Re: SV: SV: [ubl-psc] UBL PSC TC- Schema Generation

["G. Ken Holman" <gkholman@CraneSoftwrights.com>]

At 2009-10-09 22:39 +0200, Peter L. Borresen wrote:
>I see your point. Because of the ripple effect if a ABIE has a version 2.1
>BBIE, then itself becomes a 2.1 ABIE. An ABIE cannot contain ASBIEs or BBIEs
>of a higher version. Tim, please correct me if I am wrong.

I know you are not asking me, Peter, you are asking Tim ... but I'm 
more confident now after explaining in my post 
http://lists.oasis-open.org/archives/ubl-psc/200910/msg00011.html and 
thinking about it after that the column should be reserved for the 
version number that a row in the model was added to the model, not 
when its children were last changed.

One can derive the latest version by when its contents were last 
changed by looking at the versions of its children.  But one loses 
the version an ASBIE was added if it is overwritten with that 
information that can be derived simply from its members.

Why lose useful information by information that can be calculated when needed?

If I'm looking at the model for UBL 2.7, I would think it would be 
very useful to know when a particular ABIE was introduced into UBL 
(in case I have to roll back to it for some reason).  It would tell 
me, for example, that I cannot roll back to before version 2.4 
because up to 2.3 the particular ABIE was not in the model.

Though I wonder if I could look at the earliest version of any of an 
ABIEs children to know when that ABIE was created ... but that 
introduces a different meaning for the column for ABIEs than for 
ASBIEs and BBIEs.  In order to keep the meaning of the column the 
same for all rows, I think we have to interpret the column as the 
version in which the row was introduced into the model.

So I believe that indeed an ABIE can contain ASBIEs and BBIEs of a 
higher version.

I hope this is helpful ... and I am curious what Tim thinks as well.

. . . . . . . . . . . Ken


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