private static void validateLocalePart(String localePart) {
		for (int i = 0; i < localePart.length(); i++) {
			char ch = localePart.charAt(i);
			if (ch != '_' && ch != ' ' && !Character.isLetterOrDigit(ch)) {
				throw new IllegalArgumentException(
						"Locale part \"" + localePart + "\" contains invalid characters");
			}
		}
	}