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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.
Note - There are multiple schema-definition languages, including RELAX NG, Schematron, and the W3C "XML Schema" standard.
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.
Pull parsers operate on stream and if you have a large enough file they will not know it is well formed until it is read to the end.
If you need to know if it is well formed or/and valid, read it till the end or validation error (you can use next() for fast reading if you don't care about contents).