@Override
    public void startPrefixMapping(String prefix, String uri) throws SAXException {
        warn("StartPrefixMapping: \u201C" + prefix + "\u201D, \u201C" + uri + "\u201D.");
    }
@see nu.validator.checker.Checker#startPrefixMapping(java.lang.String, java.lang.String)
src/nu/validator/checker/DebugChecker.java