Example: RDDLStripper

import javax.xml.stream.*;
import java.net.*;
import java.io.*;

 
public class RDDLStripper {
    
  public final static String RDDL_NS = "http://www.rddl.org/";

  public static void main(String[] args) {
        
    if (args.length == 0) {
      System.err.println("Usage: java RDDLStripper url" );
      return;    
    }
        
    try {      
      InputStream in;
      try {
        URL u = new URL(args[0]);
        in = u.openStream();
      }
      catch (MalformedURLException ex) {
        // Maybe it's a file name
        in = new FileInputStream(args[0]);
      }
      
      XMLStreamReader parser 
       = XMLInputFactory.newInstance().createXMLStreamReader(in);
      XMLStreamWriter serializer 
       = XMLOutputFactory.newInstance().createXMLStreamWriter(System.out);
        
      while (true) {
         int event = parser.next();
         if (parser.isStartElement()) {
             String namespaceURI = parser.getNamespaceURI();
             if (!namespaceURI.equals(RDDL_NS)) {
                 serializer.writeStartElement(namespaceURI, parser.getLocalName());
                 // add attributes
                 for (int i = 0; i < parser.getAttributeCount(); i++) {
                     serializer.writeAttribute(
                       parser.getAttributeNamespace(i),
                       parser.getAttributeName(i),
                       parser.getAttributeValue(i)
                     );
                 }
                 // add namespace declarations
                 for (int i = 0; i < parser.getNamespaceCount(); i++) {
                     String uri = parser.getNamespaceURI(i);
                     if (!RDDL_NS.equals(uri)) {
                       serializer.writeNamespace(parser.getNamespacePrefix(i), uri);
                     }
                 }
             }
         }
         else if (parser.isEndElement()) {
             String namespaceURI = parser.getNamespaceURI();
             if (!namespaceURI.equals(RDDL_NS)) {
                 serializer.writeEndElement();
             }
         }
         else if (event == XMLStreamConstants.CHARACTERS
           || event == XMLStreamConstants.SPACE) {
             serializer.writeCharacters(parser.getText());
         }
         else if (event == XMLStreamConstants.CDATA) {
             serializer.writeCData(parser.getText());
         }
         else if (event == XMLStreamConstants.COMMENT) {
             serializer.writeComment(parser.getText());
         }
         else if (event == XMLStreamConstants.DTD) {
             serializer.writeDTD(parser.getText());
         }
         else if (event == XMLStreamConstants.ENTITY_REFERENCE) {
             serializer.writeEntityRef(parser.getLocalName());
         }
         else if (event == XMLStreamConstants.PROCESSING_INSTRUCTION) {
             serializer.writeProcessingInstruction(parser.getPITarget(), parser.getPIData());
         }
         else if (event == XMLStreamConstants.END_DOCUMENT) {
            serializer.flush();
            break;
         }
      }  
      serializer.close();         
      parser.close();
      
    }
    catch (XMLStreamException ex) {
       System.out.println(ex);  
    }
    catch (IOException ex) {
      System.out.println("IOException while parsing " + args[0]);   
    }
        
  }

}