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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@y...] Sent: Monday, March 27, 2006 4:28 AM To: Michael Kay; xml-dev@l... Subject: RE: 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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