cannot resolve symbo: class DOMParser with DOM and xerces-2_2_1

Hi, Everyone:
I am parsing XML with DOM and OM and Xerces-2_2_1.
I imported:

import org.apache.xerces.parsers.DOMParser;
import org.w3c.dom.*;
import java.io.*;

When I complied with the classpath, it can not resolve the symbole: class 
DOMParser.
Why? Do I need to import other packages?

Thanks in advance!

Wenpeng

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