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Two things must be understood about the validating parser: method on white space that it knows to be irrelevant.From the standpoint of an application that is interested in processing only the XML data, that is a good thing because the application is never bothered with white space that exists purely to make the XML file readable.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: Note - The parser factory must be configured to generate a parser that is namespace-aware as well as validating. More information about namespaces is provided in Document Object Model but for now, understand that schema validation is a namespace-oriented process.If these exceptions are not thrown, the validation errors are simply ignored.In general, a SAX parsing error is a validation error, although it can also be generated if the file specifies a version of XML that the parser is not prepared to handle.
It is important to recognize that the only reason an exception is thrown when a file fails validation is as a result of the error-handling code shown in Setting up Error Handling. public void warning(SAXParse Exception spe) throws SAXException public void error(SAXParse Exception spe) throws SAXException public void fatal Error(SAXParse Exception spe) throws SAXException // ...
uses the non-validating parser by default, but it can also activate validation.
Activating validation allows the application to tell whether the XML document contains the right tags or whether those tags are in the right sequence.
On the other hand, if you are writing an application that filters an XML data file and if you want to output an equally readable version of the file, then that white space would no longer be irrelevant: it would be essential.
To get those characters, you would add the This code simply generates a message to let you know that ignorable white space was seen. The SAX specification does not require that this method be invoked.
To learn more about XML Schema, you can review the online tutorial, XML Schema Part 0: Primer, at