docs: public Object nextEntity(char ampersand) throws JSONException {
  		StringBuilder sb = new StringBuilder();
  		for (;;) {
  			char c = next();
  			if (Character.isLetterOrDigit(c) || c == '#') {
  				sb.append(Character.toLowerCase(c));
  			} else if (c == ';') {
  				break;
  			} else {
  				throw syntaxError("Missing ';' in XML entity: &" + sb);
  			}
  		}
  		String string = sb.toString();
  		Object object = entity.get(string);
  		return object != null ? object : ampersand + string + ";";
  	}