Non validating dom parser
The Java XML implementation does so whenever the DTD makes it possible.
The program is configured to take additional arguments when it is started, which tell it to implement no validation, DTD validation, XML Schema Definition (XSD) validation, or XSD validation against a specific schema source file.
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.
(Even a DTD qualifies as a "schema," although it is the only one that does not use XML syntax to describe schema constraints.) However, "XML Schema" presents us with a terminology challenge.
Although the phrase "XML Schema schema" would be precise, we will use the phrase "XML Schema definition" to avoid the appearance of redundancy.
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.
This section examines the validating parser to find out what happens when you use it to parse the sample program.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.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.