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Subject: Re: [ubl] use of 'ID' in documents

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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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

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