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Subject: Re: [ubl-ndrsc] NDR Review - Section 7.7
Hi folks-- I bet you thought I had fallen off the edge of the earth, huh? I hope you're all well, and I wish you a happy 2004. I wasn't going to comment on this issue, but Mike's message has emboldened me. As he points out, it poses no particular problems that a maxOccurs greater than 1 doesn't already have, so at the least, the rationale shouldn't be as stated below. But beyond that, I think it's a little weird to actually forbid choice groups. It feels a little like "All that is not mandatory is forbidden". It's certainly going to be more rare in business documents than in prose documents; perhaps a need for it will pop up in catalogs, which are a hybrid?... I believe the main reason UBL doesn't have *any* choice groups to date is that its chosen methodology and spreadsheet encoding have no way to accommodate it. But I can certainly imagine ways for them to do so, if the need arose. Eve Grimley Michael J NPRI wrote: > Greetings, > > I know we are not currently going to reconsider decisions already made; however, we do have to change the explanatory text around the xsd:choice rule (Section 7.7 - GXS9). It currently reads: > > ================================================== > The xsd:choice compositor allows for any element declared inside it to occur in the > instance document, but only one. As with the xsd:all compositor, this feature is > inconsistent with business transaction exchanges and is not allowed in UBL. > ================================================== > > I don't think this is true. As I had mentioned on yesterday's call, because an xsd:choice element can be contained within an xsd:sequence, it leads to no more uncertainty/variability in an instance than a "minOccurs='0'" does; therefore, I don't believe it is "inconsistent with business transaction exchanges". > > Comments? > > Thank You, > Mike Grimley -- Eve Maler +1 781 442 3190 Sun Microsystems cell +1 781 354 9441 Web Products, Technologies, and Standards eve.maler @ sun.com
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