Re: reasons why an XML instance must be validated witha XML sc
Philippe is precisely correct. But I would put it more pungently: When information interchange fails, the finger of blame must be pointable. If information interchange has already failed, then if the XML is consistent with its schema, maybe the problem is on the recipient's side. If the XML is not OK, then probably there's at least one problem on the sender's side. It's usually best to *avoid* information interchange failures, and that's another good reason to validate outgoing XML instances. Before sending the XML instance, the producer process can check whether, if information interchange later fails, the parser will point the finger of blame at the producer. It's a quality-control measure for people who prefer to avoid situations in which their work is subject to objective criticism. (And that's just about everybody, I guess.) As far as I know, there's no other reason for validation than pointing the finger of blame. If all information interchange failures can be detected and diagnosed in other ways, then there's no need for XML validation. If you work in the real world, where failures of information interchange sometimes occur, XML validation is normally one of the least expensive and most powerful ways to detect, diagnose and prevent information interchange failures. (It can't detect every cause of information interchange failure, of course.) Philippe Poulard wrote: > ilango a écrit : >> If so, why should we use XML schema to validate XML? > > An XML Schema is the expression of some constraints expected on an XML > document class. Expressing constraints on XML documents ensure that > applications will process them without causing faults. Expressing > constraints with schemata ensure that applications developers will > spend most of their time in designing data process and few of their > time in controlling them. >
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