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FWIW, from a style perspective I always prefer to create an *explicit*
specification of a semantic rather than making assumptions about the
presence/absence of an information item ! If you're going to the trouble of
creating a spec for carrying information you may as well use it for all
instances IMO :-
<Bonus>0</Bonus>
<Bonus>1000000</Bonus>
Fraser.
>From: "Tolkin, Steve" <Steve.Tolkin@FMR.COM>
>To: "Michele Vivoda" <idmichele@yahoo.it>, <xml-dev@lists.xml.org>
>Subject: RE: [xml-dev] Occurrence Question
>Date: Mon, 27 Mar 2006 14:35:49 -0500
>
>Can you please clarify what you meant by "there is no difference between
>empty and absent in xml."
>
>I think there is a difference. Suppose the empty element <Bonus> is
>used as a "marker", meaning: If and only if <Bonus/> occurs then the
>person is eligible to receive a bonus.
>Clearly there is a difference between empty and absent.
>
><!-- Alex cannot get a bonus, the Bonus element is Absent -->
><Pay><Name>Alex</Name><Salary>30</Salary></Pay>
><!-- Ben can get a Bonus-->
><Pay><Name>Ben</Name><Salary>20</Salary><Bonus/></Pay>
>
>
>Hopefully helpfully yours,
>Steve
>--
>Steve Tolkin Steve . Tolkin at FMR dot COM 508-787-9006
>Fidelity Investments 82 Devonshire St. M13L Boston MA 02109
>There is nothing so practical as a good theory. Comments are by me,
>not Fidelity Investments, its subsidiaries or affiliates.
>
>
>-----Original Message-----
>From: Michele Vivoda [mailto:idmichele@yahoo.it]
>Sent: Monday, March 27, 2006 4:28 AM
>To: Michael Kay; xml-dev@lists.xml.org
>Subject: RE: [xml-dev] Occurrence Question
>
>
>Thanks, I was also thinking about this option, I think
>that the PSVI is the same because neither particle or
>choice contribute to the PSVI, and they validate the
>same instances because there is no difference between
>empty and absent in xml. So, _in a choice with
>elements only_ should be true that adding an optional
>element makes the whole choice optional. Is this that
>I wrote true, and in case, is it _always_ true, also
>with other kind of particles ?
>
>Greetings
>Michele Vivoda
>
>[rest snipped]
>
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