问转换XML时出错

EN

ERROR:  'Namespace for prefix 'SOAP-ENV' has not been declared.'
Jul 8, 2011 3:24:54 PM kumar.runs.start$2 run
SEVERE: null
javax.xml.transform.TransformerException: java.lang.RuntimeException: Namespace for prefix 'SOAP-ENV' has not been declared.
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:716)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:313).........

    SAXParserFactory saxFactory = SAXParserFactory.newInstance(); 
    SAXParser parser = saxFactory.newSAXParser(); 
    XMLReader reader = new XMLTrimFilter(parser.getXMLReader()); 

    TransformerFactory factory = TransformerFactory.newInstance(); 
    Transformer transformer = factory.newTransformer(); 
    transformer.setOutputProperty(OutputKeys.INDENT, "no"); 
    DOMResult result = new DOMResult(); 
    SAXSource ss = new SAXSource(reader, is);
    transformer.transform(ss, result); 
    return (Document)result.getNode(); 

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:enc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
    <SOAP-ENV:Header />
    <SOAP-ENV:Body>
            <swp:addOwnRet xmlns:swbep="urn:SWBEP">
                  <apples>33</apples>
                  <bucket>
                    <orange>5</orange>
                    <banana>5</banana>
                  </bucket>
            </swp:addOwnRet>
    </SOAP-ENV:Body>

package kumar.srcs;

private CharArrayWriter contents = new CharArrayWriter(); 

public XMLTrimFilter(XMLReader parent){ 
    super(parent); 
} 
public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException{ 
    writeContents(); 
    super.startElement(uri, localName, qName, atts); 
}

public void characters(char ch[], int start, int length){ 
    contents.write(ch, start, length); 
} 

public void endElement(String uri, String localName, String qName) throws SAXException{ 
    writeContents(); 
    super.endElement(uri, localName, qName); 
} 

public void ignorableWhitespace(char ch[], int start, int length){} 

private void writeContents() throws SAXException{ 
    char ch[] = contents.toCharArray(); 
    if(!isWhiteSpace(ch)) 
        super.characters(ch, 0, ch.length); 
    contents.reset(); 
} 

private boolean isWhiteSpace(char ch[]){ 
    for(int i = 0; i<ch.length; i++){ 
        if(!Character.isWhitespace(ch[i])) 
            return false; 
    } 
    return true; 
}