Validating parser software sax

From there, I’ll move on to some more handlers: the left over from the last chapter.At that point, you should have a comprehensive understanding of the standard SAX 2.0 distribution.Because validation is turned on, you should get an ugly stack trace reporting the error.Of course, because that’s all that our error handler methods do, this is precisely what we want: java javaxml2. JTree Error Handler.error(SAXTree Viewer.java:445) Remember, turning validation on or off does not affect DTD processing; I talked about this in the last chapter, and wanted to remind you of this subtle fact.However, this is not the case; the URI is just an identifier, and as I pointed out, usually resolved locally.

Finally, I’ll introduce some new handlers to you, the , and show you how they are used.Good parsers ensure that you do not need network access to resolve these features; think of them as simple constants that happen to be in URI form.These methods are simply invoked and the URI is dereferenced locally, often to constantly represent what action in the parser needs to be taken. I’ve had many browsers report this to me, insisting that the URIs are invalid.To address this, SAX 2.0 defines a standard mechanism for setting important properties and features of a parser that allows the addition of new properties and features as they are accepted by the W3C without the use of proprietary extensions or methods. This means you have to change little of your existing code to request validation, set the namespace separator, and handle other feature and property requests.The methods used for these purposes are outlined in Table 4-1.

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The most convenient aspect of these methods is that they allow simple addition and modification of features.

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