@Override
    public void comment(char[] ch, int offset, int len) throws SAXException {
        try {
            printLead();
            writer.write("<!-- ");
            writer.write(ch, offset, len);
            writer.write(" -->\n");
        } catch (IOException e) {
            throw new SAXException(e);
        }
    }
@see org.xml.sax.ContentHandler#characters(char[], int, int)
src/nu/validator/servlet/TreeDumpContentHandler.java