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It has no DOM support, and no support for validation: in fact, it is about as stripped-down as an XML parser can get. The SAX2 and JAXP libraries are not included in the package; these must be installed separately.They are available automatically if you use JDK 1.4. The JAR file includes no manifest, so placing the JAR file on your classpath will not make this the default JAXP parser.To be notified of validation errors in an XML document, the parser factory must be configured to create a validating parser, as shown in the preceding section.In addition, the following must be true: Note - The parser factory must be configured to generate a parser that is namespace-aware as well as validating. More information about namespaces is provided in Document Object Model but for now, understand that schema validation is a namespace-oriented process.

Activating validation allows the application to tell whether the XML document contains the right tags or whether those tags are in the right sequence.(Descriptions of these options, to configure the factory to return a namespace-aware parser.Sun's implementation supports any combination of configuration options.(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.You are free to modify AElfred for your own use and to redistribute AElfred with your modifications, provided that the modifications are clearly documented. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of merchantability or fitness for a particular purpose. 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.To learn more about XML Schema, you can review the online tutorial, XML Schema Part 0: Primer, at Note - There are multiple schema-definition languages, including RELAX NG, Schematron, and the W3C "XML Schema" standard.