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In other words, it can tell you whether the document is valid.If validation is not activated, however, it can only tell whether or not the document is well-formed, as was shown in the previous section when you deleted the closing tag from an XML element.Remember that your application will not generate a validation exception unless you supply an error handler such as the one here.
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.
Because JAXP-compliant parsers are not namespace-aware by default, it is necessary to set the property for schema validation to work.
In addition to the error handling described in Setting up Error Handling, there is one error that can occur when configuring the parser for schema-based validation.
option and providing the name of the schema source file to be used.
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 // ...