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To be notified of validation errors in an XML document, the parser factory must be configured to create a validating parser, as shown in the preceding section.
In addition, the following must be true: You'll learn more about namespaces in Validating with XML Schema.
To see what happens when the XML document does not specify a DTD, remove the declaration. Because you don't yet have one, it's value is null.
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.
After you've learned more about namespaces, you'll see how to use XML Schema to validate complex documents that use them.
80% of you will probably never need to use the material in this chapter, and Chapter 3 will completely cover your needs.If the parser is not 1.2-compliant and therefore does not support XML Schema, it can throw a Note: You'll learn about namespaces in Validating with XML Schema.For now, think of these attributes as the "magic incantation" you use to validate a simple XML file that doesn't use them.For now, understand that schema validation is a namespace-oriented process.Because JAXP-compliant parsers are not namespace-aware by default, it is necessary to set the property for schema validation to work.