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Hi Oliver Not sure I fully follow - could you provide the XML Schema types and syntax? I am not sure if a and aa are types or elements - seems like you may mean they are both? Jim -----Original Message----- From: Olivier Rossel [mailto:olivier.rossel@gmail.com] Sent: Monday, October 05, 2009 2:04 AM To: xml-dev@lists.xml.org Subject: Schemas and the open world assumption. Hello everyone. Sorry to be 5 years late, but it is just today that I question myself about derivation by extension and closed world assumption. Please do not hesitate to comment the following points: If I define "a" as being a sequence of b,c: <a> <b/> <c/> </a> and i extend "a" into "aa" that extends that sequence with d: <aa> <b/> <c/> <d/> </aa> then any "aa" will not validate against the definition of "a". right? this sounds like a MAJOR difference with OO paradigm (where any "aa" is also a "a"). that is what i call the closed world assumption in xml validation. considering i need a more open world approach, i plan to relax my schema by defining "a" in this way: <a> <b/> <c/> <xsd:any> </a> then i feel like i could extend my "a" definition without breaking the "subclass" philosophy. can anyone comment that point of view? i am especially interested in possible pitfalls i could have missed in using the "any" statement. i am also interested in best practices when defining modular expandable models. any help is very welcome. _______________________________________________________________________ XML-DEV is a publicly archived, unmoderated list hosted by OASIS to support XML implementation and development. To minimize spam in the archives, you must subscribe before posting. [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ Or unsubscribe: xml-dev-unsubscribe@lists.xml.org subscribe: xml-dev-subscribe@lists.xml.org List archive: http://lists.xml.org/archives/xml-dev/ List Guidelines: http://www.oasis-open.org/maillists/guidelines.php
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