public int getMaximumAllowedCharacter() {
        if (maximumAllowedCharacter == 0) {
            maximumAllowedCharacter = defaultMaximumAllowedCharacter();
        }
        return maximumAllowedCharacter;
    }
Returns the maximum allowed character code that should be allowed
unescaped which defaults to 127 in US-ASCII (7 bit) or
255 in ISO-* (8 bit).
@return the maximum character code
xmppserver/src/main/java/org/jivesoftware/util/XMLWriter.java