public abstract Document parse(InputSource source) throws SAXException, IOException;
public Document parse (File file) throws SAXException, IOException { if (file==null) { throw new IllegalArgumentException("File si 'null'"); } InputSource	source;  source = new InputSource (fileToURL (file)); source.setByteStream (new FileInputStream(file)); return parse (source); }
	public abstract Document parse(InputSource source) 		throws SAXException, IOException;