On 15-04-15 23:11, Thomas Beale wrote: > On 15/04/2015 17:28, Bert Verhees wrote: >> On 15-04-15 17:19, Dmitry Baranov wrote: >>> Sorry Bert ) I had to explain that Oracle 11 is a business >>> requirement, not a hardware limitation. >>> >>>> Just do it, and then it should run fine, although you have to >>>> change the >>>> XML-Schemas (a bit) before registering them to Oracle. I already >>>> explained to you before what and why. >>> I remember your advise but not sure that changing all the sequences >>> to choices is a right way for many reasons. And I'm almost sure that >>> it's an Oracle bug since other XSD validation tools (visual studio, >>> netbeans and eclipse) say that my instance files are all OK and >>> conform to XML schema. >> >> You are right it is a messy solution, but if you use "sequence", like >> it is defined in the XML Schema, you have to take care that all the >> nodes in your XML are in the right/defined order. >> I think this is hard to achieve when XML-files are created in >> production, but of course, you can arrange that as an alternative. >> >> I think it is a stupid rule in the XML-Schema standard. > > I just hit this in doing the AOM2 schema. It's a completely senseless > rule, clearly a hangover from 'document' thinking - nothing to do with > 'data' thinking. I ended up replacing <sequence> with. > > <xs:choice maxOccurs="unbounded">
It is a poor man's choice, because of the side-effects. The "choice"-constraint makes the engine ignore the minOccurs/maxOccurs constraints in the elements under the choice element. > > I have to say, XML-schema based data looks extremely unattractive as a > basis for anything except data exchange. I wouldn't try to implement > anything important inside a system with it, you are too compromised in > too many ways. It is also used, as I wrote yesterday, to tell an XML-database how, in a specific namespace, the data are arranged, in that way the database can auto-create indexes, etc. There is no other way to communicate the structure of XML-documents, and even if we found another way, or invented it ourselves, we still would need a broad acceptation. I never heard that there is any work going on in the committees, because XML Schema 1.1 is almost 15 years old. I believe it is considered finished. If that is true, it is very sad. Bert
