SV: [ubl-dev] Order items - substitution items - optimization

["Bryan Rasmussen" <BRS@itst.dk>]

I have to go with Chee-Kai (excuse me if I'm mixing surname and forename),
Buyers and Sellers are derived from the class Party if I understand the
thinking correctly (I have tried to keep out of the modelling/semantics
discussions because I didn't agree with much from an XML aesthetics
discussion and didn't see any reason to fight against what seems foregone,
the downside is that I don't know much of the arguments as to why things are
as they are).

It seems David is arguing that rather they are both Party instances that have
a role of either Buyer or Seller. This doesn't seem right because there is a
major difference between them in a business context, although not modelled in
UBL 2.0 internally in the structure of a Buyer or Seller, and that difference
is in which direction the money is moving. Given such a major difference,
even if it is implicit, it somehow feels right to identify them by naming the
structure rather than by giving a generic structure a role. (but note, this
is just a feeling on my part)

At any rate, because of the difference in which direction the money is
moving, what optimization is possible? Surely you will still have to process
them seperately.

Cheers,
Bryan Rasmussen



-----Oprindelig meddelelse-----
Fra: Chin Chee-Kai [mailto:cheekai@SoftML.Net]
Sendt: 18. januar 2007 05:21
Til: David RR Webber (XML); ubl-dev@lists.oasis-open.org
Emne: Re: [ubl-dev] Order items - substitution items - optimization


At 01:14 PM 2007-01-17 -0700, David RR Webber \(XML\) wrote:
>Folks - just reviewing this - seems like Buyer and Seller substitution
>items are identical structurally (but HUGE!) - therefore it would make
>more sense to just have one of them in the schema structure -
>repeatable - and then a mandatory LineType of either "Buyer" /
>"Seller".

I'm afraid this would discard the whole point of cementing the semantics
of "Buyer" with the Buyer tag and the semantics of "Seller" with the Seller
tag which UBL 1.0 & 2.0 so readily provide now.

Informatically, you cannot throw away, or rather optimise (to put it
more nicely), the bit information of "Buyer/Seller".  This means that
if you have a GenericBuyerOrSeller tag, you're going to need a flag of
some sort as a child of that to distinguish them apart.  The decision
to use either
<GenereicBuyerOrSeller>
   <Flag>I-am-a-Buyer</Flag>
   ...
</GenereicBuyerOrSeller>
<GenereicBuyerOrSeller>
   <Flag>I-am-a-Seller</Flag>
   ...
</GenereicBuyerOrSeller>

OR

<Buyer>...</Buyer>
<Seller>...</Seller>

is thrashed out within UBL, and I suppose the common wisdom coming out
of UBL 1.0 & 2.0 is the latter form.




Best Regards,
Chin Chee-Kai
SoftML
Tel: +65-6820-2979
Fax: +65-6820-2979
Email: cheekai@SoftML.Net
http://SoftML.Net/


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