What's the diff?

package com.developerWorks.xml.util;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
public class CommonResolver implements EntityResolver {
    public void resolveEntity(String publicID, String systemID)
        throws SAXException {
        
        // Look for the NHLCopyright system ID
        if ((systemID.equals("http://www.nhl.com/nhlCopyright.xml")) ||
            (systemID.equals("http://www.dallasStars.com/nhl/copyright.xml"))) {
            // You could add other system IDs for comparison here, as well
            
            return new InputSource("myLocalCopyright.xml");
        }
        
        // In all other cases, return null
        return null;                   
    }
}