4.5. XML Validation
Most XML parsers provide a validation capability. Validation means that beyond just ensuring that the XML is well-formed, the parser will also verify that the XML document conforms to the DTD or XML Schema. Unfortunately, telling a parser whether or not it should use validation is one of the things that is implementation-dependent, so there is no portable way to turn validation on or off.
For the Apache Xerces parser, validation is turned on and off by a setFeature() method. For SAX, you can call setFeature() on the org.xml.sax.XMLReader object (if you're using JAXP, you can obtain a reference to this object by calling the getXMLReader() method of the javax.xml.parsers.SAXParser object). For DOM, you must call the setFeature() ...
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