public class XmlDataLoader <T>
{
	private static final Logger	log				= Logger.getLogger(XmlDataLoader.class);

	@SuppressWarnings("unchecked")
	public T loadStaticData(Class<?> clazz, String Schema, String XmlFile) 
	{
		try
		{
			JAXBContext jc = JAXBContext.newInstance(clazz);
			Unmarshaller un = jc.createUnmarshaller();
			un.setSchema(getSchema(Schema));
			return  (T) un.unmarshal(new File(XmlFile));
		}
		catch (JAXBException e)
		{
			log.fatal("Error while loading xml data"+ e.getErrorCode(), e);
			throw new Error("Error while loading xml data", e);
		}

	}

	private static Schema getSchema(String Schema)
	{
		SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
		Schema schema = null;
		try
		{
			schema = sf.newSchema(new File(Schema));
		}
		catch (SAXException e)
		{
			log.fatal("Error getting schema", e);
			throw new Error("Error getting schema", e);
		}

		
		return schema;
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<opcodes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:noNamespaceSchemaLocation="packets.xsd">
	<opcodelist direction="DOWNSTREAM"
		package="org.wowemu.login.network.netty.packet.client.">
		<packet id="00" name="CMD_AUTH_LOGON_CHALLENGE" state="CONNECTED"/>
	</opcodelist>
	<opcodelist direction="UPSTREAM"
		package="org.wowemu.login.network.netty.packet.server.">
		<packet id="00" name="TCMD_AUTH_LOGON_CHALLENGE"/>
	</opcodelist>
</opcodes>