code: public XMLWriter toXML(XMLWriter xw)
  			throws IOException
  			{
  		xw.printRaw("<?xml version='1.0' standalone='no' ?>");
  		//xw.printRaw("<!DOCTYPE " + XML_CONTENT_TYPE + " SYSTEM '" + XML_DTD + "' >");
  		xw.openTag("JFatCatConfig");
  
  		xw.openTag("PDBFILEPATH");
  		// we don;t serialize the tempdir...
  		String tempdir = System.getProperty(TMP_DIR);
  		if (! pdbFilePath.equals(tempdir))
  			xw.attribute("path", pdbFilePath);
  
  		xw.attribute("fetchBehavior", fetchBehavior+"");
  		xw.attribute("obsoleteBehavior", obsoleteBehavior+"");
  		xw.attribute("fileFormat", fileFormat);
  		xw.closeTag("PDBFILEPATH");
  
  		xw.closeTag("JFatCatConfig");
  		return xw ;
  
  			}
docs: convert Configuration to an XML file so it can be serialized
  add to an already existing xml file.
  
  @param xw the XML writer to use
  @return the writer again
  @throws IOException
  @see org.biojava.nbio.structure.align.webstart.ConfigXMLHandler