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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Schema concepts
 THOMAS PASSIN wrote: > Stefan Haustein wote, responding to my post that responded to Jeff Lowery's: > > While I agree to your statement, I do not understand the conclusion: > > Wouldn't a simplified XML Schena spec help all processors, regardless > > if they are OOP or not? > > > Yes, I think simplicity is ***very*** important. As simple as possible. > The hard part comes with the addendum: "but as complete as necessary". > Efforts to be complete tend to sacrifice simplicity, don't they? In part, I > imagine, XML-Schema is complex beause the authors are trying to be complete > about difficult abstractions. So there are really two issues, aren't there? > 1) Is the correct set of abstractions present? and 2) if they are, are they > expressed with as much simplicity as possible? Yes, that's a good point. So the question arises "what exactly are the different levels of abstractions covered by <type> and <element>"? (My opinion is that one level of abstraction is enough to describe an XML schema. I agree that XML schema applications need higher levels of abstractions than just the schema syntax, but they cannot be covered inside XML schema completely anyway. So, I personally would prefer a simple schema with a good extension or link-in mechanism over the current specs including "some" additional abstraction level not fitting my needs.) > Even if we stuck with an OOP paradigm, there is not universal agreement on > what either a class or type is. For example, forget methods, OK, but don't > we have to leave in inheritance? But how about multiple inheritance or > inheritance with restriction (i.e., the child omits some properties of the > parent)? BTW: Multiple inheritance is covered neither by <element> nor by <type> in the current XML schema specs. Best regards Stefan -- Stefan Haustein University of Dortmund Computer Science VIII www-ai.cs.uni-dortmund.de *************************************************************************** This is xml-dev, the mailing list for XML developers. To unsubscribe, mailto:majordomo@x...&BODY=unsubscribe%20xml-dev List archives are available at http://xml.org/archives/xml-dev/threads.html *************************************************************************** 
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