this comes from trying to implement a rule that goes along the lines of...
"all documents must have an ID. However with some documents (eg Order)
it may be either the BuyersID and/or the SellersID"
unfortunately we dont have schema (or spreadsheet) syntax for "either
are optional but one must be used" - which is actually a common rule in
the real world. What we have don is the best we can.
Anne Hendry wrote:
> We notice that some documents contain an 'ID' element. The 'ID'
> elements seem to be mandatory. The documents that don't have 'ID'
> seem to have 'BuyersID' and 'SellersID', but those are optional.
>
> Is this an intended modeling aspect that assumes in the documents that
> don't have 'ID' the users would implement either a BuyersID or
> SellersID, even though they are both optional? Do we want to
> duplicate this model for new documents? When do you determine you
> want a mandatory ID vs. two optional Buyers|Sellers IDs?
>
> Thanks,
> Anne
>
>
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--
regards
tim mcgrath
phone: +618 93352228
postal: po box 1289 fremantle western australia 6160
DOCUMENT ENGINEERING: Analyzing and Designing Documents for Business Informatics and Web Services
http://mitpress.mit.edu/catalog/item/default.asp?sid=632C40AB-4E94-4930-A94E-22FF8CA5641F&ttype=2&tid=10476
