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.
(Descriptions of these options, to configure the factory to return a namespace-aware parser.
Xmlreader non validating
Remember that your application will not generate a validation exception unless you supply an error handler such as the one here.
As mentioned earlier, warnings are generated only when the SAX parser is processing a DTD.
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.
Note - More information about namespaces is included in Validating with XML Schema in Document Object Model.