XDR – perform validation using a XDR Validation Type.
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And then, once you know how to perform validation, you also need to know how to handle validation errors, which is why this article also includes a simple example that uses built-in exception handling mechanisms to trap errors that the Reader may come across. I’ll explain how the XMLValidating Reader works by again referring to the sample XML instance created in the first part of this article.
In case you don’t remember what it looked like, here it is again: [code] attribute.
Here, I need to first initialize a plain-vanilla Xml Text Reader object, and then pass this object as a parameter to the new Xml Validating Reader object, as shown below: [code][/code] You can set the “Validation Type” property of the Xml Validating Reader object to any one of the following: Validation Type. Auto – search for a file automatically; if available, carry out validation Validation Type.
DTD – perform validation using a DTD Validation Type.
Now you may, as I did initially, question the rationale behind having a reader for such a specific requirement — after all, you can easily use the method and properties of the Xml Document object to parse the file.
But it’s important to remember that DOM parsing is a processor-intensive task; therefore, using an Xml Reader object (which is faster and not as resource-hungry as the regular DOM parser) can produce better results in some cases.Second, it is not wise to assume that your application will always receive XML data in the form of a flat file or an XML data stream.XML data might even come to you in the form of a fragment of DOM tree.In such situations, you’ll also need to know how you can use a DTD to validate an XML document instance.Here’s the updated XML file — notice it now includes a reference to a DTD instead of an XML Schema: [code][/code] A close look at this file and you will see that it describes the structure of the XML document instance fairly well.Finally, assuming no errors in validation, you can iterate over the document and process the XML inside it with the variable, displaying the appropriate outcome of the validation process to the user in the browser.