[MMUSIC] draft-ietf-mmusic-rfc4566bis-10: can attributes have a null value

Brett Tate <brett@broadsoft.com> Tue, 05 August 2014 14:18 UTC

Return-Path: <brett@broadsoft.com>
X-Original-To: mmusic@ietfa.amsl.com
Delivered-To: mmusic@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 635191B27F5 for <mmusic@ietfa.amsl.com>; Tue, 5 Aug 2014 07:18:24 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.979
X-Spam-Level:
X-Spam-Status: No, score=-1.979 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id roHrStO-bxiI for <mmusic@ietfa.amsl.com>; Tue, 5 Aug 2014 07:18:19 -0700 (PDT)
Received: from mail-vc0-f177.google.com (mail-vc0-f177.google.com [209.85.220.177]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 46E6A1A0312 for <mmusic@ietf.org>; Tue, 5 Aug 2014 07:18:19 -0700 (PDT)
Received: by mail-vc0-f177.google.com with SMTP id hy4so1561569vcb.8 for <mmusic@ietf.org>; Tue, 05 Aug 2014 07:18:18 -0700 (PDT)
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:mime-version:thread-index:date:message-id :subject:to:content-type; bh=4TgMuR6XPjQ0tfqAFRYtQxZO7hneIvzIMxoNBAmOZRQ=; b=heS04QRIL2qVQrn3jH8bDY6ZP3tAhxhHxcpm4Jg6GmJOZq2ULYV/yb6f8M+/ahtvWc kIBO6GPb4jpA6zY4CNtQ2msjffJmEk+Iw59D9Oy5yoBKfW09oBmagHQ1IqW/Os58k1r3 kw0uptOw9oUTnuFJVIhialSX9Zy0jx63s+5iE0HYv6DsOpAZkS/Vi60OVS9bdsIus1N+ IBMuKUIQusLyUitLWGxIySXj2Nb8RVNpx4xC/YkPkYjYq8Q2Ge5Vy/0HuSEOdBcACKjZ imVmDqrRE0bFj3RUXHg0Ei50hXGl/VclcUEk+ehcfHHEwXQV0+OEGwgUIKBgxWEWy2aY OyIg==
X-Gm-Message-State: ALoCoQl+plZrK37dqeTDmOZ1WcAkxMyq523du+0qc8H13hbsy4SfySIsn+uxuavz5FtxJ/Mn7FZJ
X-Received: by 10.53.3.169 with SMTP id bx9mr1529913vdd.80.1407247972705; Tue, 05 Aug 2014 07:12:52 -0700 (PDT)
From: Brett Tate <brett@broadsoft.com>
MIME-Version: 1.0
X-Mailer: Microsoft Outlook 14.0
Thread-Index: Ac+wtz8/SRlEsRzHTeyKczkmwewwRA==
Date: Tue, 5 Aug 2014 10:12:52 -0400
Message-ID: <b0f1449ce327d51a1a6e947df246533f@mail.gmail.com>
To: mmusic@ietf.org
Content-Type: text/plain; charset=UTF-8
Archived-At: http://mailarchive.ietf.org/arch/msg/mmusic/nDB-bV6aueC0IlhGVWLXD5tqxuo
Subject: [MMUSIC] draft-ietf-mmusic-rfc4566bis-10: can attributes have a null value
X-BeenThere: mmusic@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: Multiparty Multimedia Session Control Working Group <mmusic.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/mmusic>, <mailto:mmusic-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/mmusic/>
List-Post: <mailto:mmusic@ietf.org>
List-Help: <mailto:mmusic-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/mmusic>, <mailto:mmusic-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 05 Aug 2014 14:18:24 -0000

Hi,

Draft-ietf-mmusic-rfc4566bis-10 section 5.13 discusses two formats of
attribute fields.  However, it doesn't appear to clearly indicate the
validity/invalidity of colon without a value.

Is an attribute such as "a=rtcp-xr:" valid?  For instance, RFC 3611
indicates that it is valid; however errata 3795 indicates that it
potentially shouldn't be valid.

Should draft-ietf-mmusic-rfc4566bis-10 section 5.13 be updated to clarify
the topic?

Thanks,
Brett