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Oh well...) So what happens when you run the parser on your current version of the slide presentation, with the DTD specified? Element "item" does not allow "em" -- (#PCDATA|item) sax. That code is reproduced below: In general, a SAX parsing error is a validation error, although we have seen that it can also be generated if the file specifies a version of XML that the parser is not prepared to handle.SAXParse Exception: Element "item" does not allow "em" -- (#PCDATA|item) at xml.parser. The thing to remember is that your application will not generate a validation exception unless you supply an error handler like the one above.You'll learn more about namespaces in Using Namespaces.For now, understand that schema validation is a namespace-oriented process.

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.Thanks to James Clark and to the Apache project, whose parsers helped me improve my own.If you want to build Piccolo from the source code, you will also need Apache's Ant, a tool similar to UNIX "make".It's time to have a look at the validating parser and find out what happens when you use it to parse the sample presentation. The reference implementation supports any combination of configuration options.(If a combination is not supported by any particular implementation, it is required to generate a factory configuration error.)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 existing schema written in the XML Schema language.

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