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This section examines the validating parser to find out what happens when you use it to parse the sample program.Two things must be understood about the validating parser: method on white space that it knows to be irrelevant.(You can also examine the sample programs that are part of the JAXP download.They use a simple XML Schema definition to validate personnel data stored in an XML file.)Note: There are multiple schema-definition languages, including RELAX NG, Schematron, and the W3C "XML Schema" standard.Since JAXP-compliant parsers are not namespace-aware by default, it is necessary to set the property for schema validation to work.You also set a factory attribute specify the parser language to use.Does something less with the SPI for JAXP in the OSGi bundle?
For now, understand that schema validation is a namespace-oriented process.I added a couple checks and moved some of the exception handling around so if document builder creation fails, it fails right away but the schema creation stuff will just log an INFO and continue. uses the non-validating parser by default, but it can also activate validation.It's time to have a look at the validating parser to find out what happens when you use it to parse the sample presentation.You need to understand about two things about the validating parser at the outset: .(To learn more about XML Schema, you can review the online tutorial, Note: There are multiple schema-definition languages, including RELAX NG, Schematron, and the W3C "XML Schema" standard.(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.Now that you understand more about namespaces, you're ready to take a deeper look at the process of XML Schema validation.Although a full treatment of XML Schema is beyond the scope of this tutorial, this section will show you the steps you need to take to validate an XML document using an XML Schema definition.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.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.