中文XML论坛--求助！！

我照着书上写了个例程
但是给果不对
程序如下import org.xml.sax.XMLReader;
import org.xml.sax.helpers.XMLReaderFactory;
import org.apache.xerces.parsers.SAXParser;
import java.io.IOException;
import org.xml.sax.SAXException;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;

public class MySAXParser
{
    public void parserXML(String url)
    {
        try{
            System.out.println("现在分析XML文件"+url+"\n\n");
            XMLReader parser = XMLReaderFactory.createXMLReader(
                    "org.apache.xerces.parsers.SAXParser");
            parser.setContentHandler(new MyContentHandler());
            parser.setFeature("http://xml.org/sax/features/validation",true);
            parser.parse(url);
        }catch(IOException ioe)
        {
            ioe.printStackTrace();
        }catch(SAXException saxe)
        {
            System.out.println("error formed!");
            saxe.printStackTrace();
        }
    }

    public static void main(String[] args)
    {
        if(args.length != 1)
        {
            System.out.println("请输入你想分析的文件 " +
                    "java example3-1[XML URL]");
        }
        String url = args[0];
        MySAXParser myParser = new MySAXParser();
        myParser.parserXML(url);
    }
}
class MyContentHandler implements ContentHandler
{
    private Locator locator;
    public void setDocumentLocator(Locator locator)
    {
        System.out.println("设置 locator 对象......");
        this.locator = locator;
    }
    public void startDocument() throws SAXException
    {
        System.out.println("文件分析开始->");

    }
    public void endDocument() throws SAXException
    {
        System.out.println("<-文件分析结束");
    }
    public void startPrefixMapping (String prefix,String uri) throws SAXException
    {
        System.out.println("命名空间对应开始->"+ "第" +
                locator.getLineNumber() + "行" + "\n\t命名空间前导符：" + prefix
                + "\n\t相应的统一资源标示： "+ uri);
    }
    public void endPrefixMapping(String prefix) throws SAXException
    {
        System.out.println("<-命名空间对应结束");
    }
    public void startElement(String namespaceURI,String localName,String qName,Attributes atts)
    throws SAXException
    {
        System.out.print("元素分析开始:" + localName);
        if(namespaceURI.equals("")){
            namespaceURI = "没有这种命名空间";
        }
        System.out.println("命名空间:" + namespaceURI + " 新名称 "+qName + ".");
        for(int i = 0;i <atts.getLength();i++)
        {
            System.out.println("\t 属性名称 :"+atts.getLocalName(i)+
                    "=" + atts.getValue(i)+".");
        }
    }
    public void endElement(String namespaceURI,String localName,String qName)
    throws SAXException
    {
        System.out.print("元素结束:" + localName);
        if(namespaceURI.equals(""))
        {
            namespaceURI = "没有这样的命名空间";
        }
        System.out.println(",命名空间:" + namespaceURI +
                ", 新名称:"+ qName + ".");
    }
    public void characters(char ch[],int start,int length)throws SAXException
    {
        String charData = new String(ch,start,length);
        System.out.println("字符数据 :\""+charData+"\"");
    }
    public void ignorableWhitespace(char ch[],int start,int length)
    throws SAXException
    {
        String whiteSpace = new String(ch,start,length);
        System.out.println("空格符 :\""+whiteSpace+"\"");
    }
    public void processingInstruction(String target,String data)
    throws SAXException
    {
        System.out.println("要分析的实体" + target +
                "和数据" + data);
    }
    public void skippedEntity(String name)
    throws SAXException
    {
        System.out.println("忽略的对象:" + name);
    }
}
我想问一下怎样修改这个代码验证有schema 的xm文档l


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