private void detectPrefix(String s, XmlTag tag) {
      if (s != null && !(tag instanceof HtmlTag) && s.length() < 1000) {
        Matcher matcher = PREFIX_PATTERN.matcher(s);
        while (matcher.find()) {
          String group = matcher.group();
          myHolder.addUsedPrefix(group.substring(0, group.length() - 1));
        }
      }
    }
private void detectPrefix(String s, XmlTag tag)