Validating non validating parser xml
Remember that your application will not generate a validation exception unless you supply an error handler such as the one here.Conforming XML processors fall into two classes: validating and non-validating.while DOM gave us facility of tree structure which we can obtain from an XML document after parsing it with SAX parser.
[Definition: Validating processors MUST, at user option, report violations of the constraints expressed by the declarations in the DTD, and failures to fulfill the validity constraints given in this specification.] To accomplish this, validating XML processors MUST read and process the entire DTD and all external parsed entities referenced in the document.If it did not help you, please reject it and add comments as to status and what else is needed.If you wish to award multiple experts, just comment here with detail.In other words, the message is saying that you are trying to validate the document, but no DTD has been declared, because no declaration is present. (In the next section, you'll learn how to define parameter entries so that we can use XHTML in the elements we are defining as part of the slide presentation.) It is important to recognize that the only reason an exception is thrown when the file fails validation is as a result of the error-handling code you entered in the early stages of this tutorial.So now you know that a DTD is a requirement for a valid document. What happens when you run the parser on your current version of the slide presentation, with the DTD specified? That code is reproduced here: is a validation error, although you have seen that it can also be generated if the file specifies a version of XML that the parser is not prepared to handle.
Here, you use the constants you defined earlier to specify the W3C's XML Schema language: In the process, however, there is an extra error to handle. In addition to the error handling you've already learned about, there is one error that can occur when you are configuring the parser for schema-based validation.