Re: [apps-discuss] "X-" revisited

Larry Masinter <masinter@adobe.com> Tue, 12 July 2011 01:26 UTC

Return-Path: <masinter@adobe.com>
X-Original-To: apps-discuss@ietfa.amsl.com
Delivered-To: apps-discuss@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E1B8C11E8213 for <apps-discuss@ietfa.amsl.com>; Mon, 11 Jul 2011 18:26:45 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -106.599
X-Spam-Level:
X-Spam-Status: No, score=-106.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100]
Received: from mail.ietf.org ([64.170.98.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Mog+Gi0Z1Y2l for <apps-discuss@ietfa.amsl.com>; Mon, 11 Jul 2011 18:26:45 -0700 (PDT)
Received: from exprod6og110.obsmtp.com (exprod6og110.obsmtp.com [64.18.1.25]) by ietfa.amsl.com (Postfix) with ESMTP id DA8C311E80D2 for <apps-discuss@ietf.org>; Mon, 11 Jul 2011 18:26:44 -0700 (PDT)
Received: from outbound-smtp-1.corp.adobe.com ([192.150.11.134]) by exprod6ob110.postini.com ([64.18.5.12]) with SMTP ID DSNKThuiyZriHtnoi4FrX3mFTZMPykO9NdNt@postini.com; Mon, 11 Jul 2011 18:26:44 PDT
Received: from inner-relay-4.eur.adobe.com (inner-relay-4.adobe.com [193.104.215.14]) by outbound-smtp-1.corp.adobe.com (8.12.10/8.12.10) with ESMTP id p6C1PIES003768; Mon, 11 Jul 2011 18:25:19 -0700 (PDT)
Received: from nacas03.corp.adobe.com (nacas03.corp.adobe.com [10.8.189.121]) by inner-relay-4.eur.adobe.com (8.12.10/8.12.9) with ESMTP id p6C1QTMT008372; Mon, 11 Jul 2011 18:26:30 -0700 (PDT)
Received: from nambxv01a.corp.adobe.com ([10.8.189.95]) by nacas03.corp.adobe.com ([10.8.189.121]) with mapi; Mon, 11 Jul 2011 18:26:29 -0700
From: Larry Masinter <masinter@adobe.com>
To: Peter Saint-Andre <stpeter@stpeter.im>, John C Klensin <john@jck.com>
Date: Mon, 11 Jul 2011 18:26:09 -0700
Thread-Topic: [apps-discuss] "X-" revisited
Thread-Index: Acw/1+CoNID7GPQtQiSfg5ajuhEQZAAWbS/w
Message-ID: <C68CB012D9182D408CED7B884F441D4D05CB129EB0@nambxv01a.corp.adobe.com>
References: <4E08CDCB.70902@stpeter.im> <4E13DC15.2080302@stpeter.im> <60B61428BA7C86CBCF4D236D@PST.JCK.COM> <4E1B0A22.7080209@stpeter.im>
In-Reply-To: <4E1B0A22.7080209@stpeter.im>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
acceptlanguage: en-US
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Cc: "apps-discuss@ietf.org" <apps-discuss@ietf.org>
Subject: Re: [apps-discuss] "X-" revisited
X-BeenThere: apps-discuss@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: General discussion of application-layer protocols <apps-discuss.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/apps-discuss>, <mailto:apps-discuss-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/apps-discuss>
List-Post: <mailto:apps-discuss@ietf.org>
List-Help: <mailto:apps-discuss-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/apps-discuss>, <mailto:apps-discuss-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 12 Jul 2011 01:26:46 -0000

Don't the considerations around "x-" also apply to "vnd." in media types?

vendor-specific media types become standards. standard media types get vendor-specific extensions.

The additional "information" that we imagine is associated with "x-" or "vnd." is 
* not testable
* can evolve over time with no transition method, plan, policy in place
* has no cost associated with mis-use  (calling something x- or vnd. when it isn't, or not using x- or vnd. when proscribed).

In the general area of registry values, any lexical convention for registry values must have some actual implementation consequences for most of the community to take the restrictions seriously. 

Larry
--
http://larry.masinter.net