From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <netdev-owner@vger.kernel.org>
Received: from mail-pf0-f169.google.com ([209.85.192.169]:36159 "EHLO
        mail-pf0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1753857AbeCFQ5U (ORCPT
        <rfc822;netdev@vger.kernel.org>); Tue, 6 Mar 2018 11:57:20 -0500
Received: by mail-pf0-f169.google.com with SMTP id 68so8973054pfx.3
        for <netdev@vger.kernel.org>; Tue, 06 Mar 2018 08:57:20 -0800 (PST)
Date: Tue, 6 Mar 2018 08:57:11 -0800
From: Stephen Hemminger <stephen@networkplumber.org>
To: David Ahern <dsahern@gmail.com>
Cc: netdev@vger.kernel.org, Stephen Hemminger <sthemmin@microsoft.com>
Subject: Re: [PATCH iproute2-next 3/7] ip: add json support to ip rule
Message-ID: <20180306085711.65883625@xeon-e3>
In-Reply-To: <5da46133-9cbb-c8c7-18c1-eab5cebcb6da@gmail.com>
References: <20180306030501.1289-1-stephen@networkplumber.org>
        <20180306030501.1289-4-stephen@networkplumber.org>
        <5da46133-9cbb-c8c7-18c1-eab5cebcb6da@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: netdev-owner@vger.kernel.org
List-ID: <netdev.vger.kernel.org>

On Tue, 6 Mar 2018 09:51:29 -0700
David Ahern <dsahern@gmail.com> wrote:

> NULL for detached value seems weird.
> [ {
>         "priority": 998,
>         "src": "all",
>         "iif": "dummy2",
>         "iif_detached": null,
>         "table": "1"
>     },
> 
> Is that normal for json for fields that only exist when a value is true?

null is the best way to indicate a value with presence having a meaning.