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RE: I-D Submission: draft-lee-httpext-metadata-00.txt

From: 이문상 <sang0627.lee@samsung.com>
Date: Sun, 04 Jul 2010 14:28:17 +0900
To: 'Eran Hammer-Lahav' <eran@hueniverse.com>, ietf-http-wg@w3.org
Message-id: <001301cb1b39$b5099120$1f1cb360$%lee@samsung.com>

Thanks for your comments, Eran.
According to your suggestion, I've read documents you mentioned. And, let
me ask and explain several things which show differences between my
proposal and other prior proposals.

If a context IRI is "http://domain/music.mp3", how does the Link header
provide additional information about music.mp3? It may provide Link header
like Link: <music.xml>; rel="describedby" type="application/powder+xml"
while combining Link header and POWDER. Or, It may also possible to combine
Link header and hostmeta as you mentioned. However, if we focus on the
acquisition of resource meta-data, these kinds of approach enlarge response
time and complicate server maintenance as below.

1. Indirect meta-data
Any combination using existing standards requires two separate requests to
get the meta-data of a resource, one for retrieving Link header and the
other for retrieving meta-data itself. It increases response time for meta-
data acquisition transaction and overall network traffic. 

2. Consistency consideration
According to previous proposals, it is required to keep consistency between
a resource and its meta-data. For example, if a publisher has modified or
removed music.mp3, then its linked document should also be modified or
removed to keep the consistency. Web is alive and millions of resources are
created, modified, and removed every day. Updating resource status to its
linked document is not trivial especially for large web server with dynamic

Moon-Sang Lee

Moon-Sang Lee, Senior Engineer, Ph.D.
Convergence Software Lab., Digital Media & Communication R&D Center,
Samsung Electronics Co., Ltd.,
TEL: +82-31-279-8082
Email: sang0627.lee@samsung.com
Wisdom begins in wonder. *Socrates*

-----Original Message-----
From: Eran Hammer-Lahav [mailto:eran@hueniverse.com] 
Sent: Saturday, June 26, 2010 4:54 PM
To: 이문상; ietf-http-wg@w3.org
Subject: RE: I-D Submission: draft-lee-httpext-metadata-00.txt


You are entering an area with a lot of prior experience.

There is little reason to extend HTTP with additional headers given the
recent work on the HTTP Link header [1] (and the 'describedby' relation
type), as well as the POWDER [2] and XRD [3] descriptor formats, and the
host-meta proposal [4] which is currently in last call. In addition, you
might want to take a look at analysis included in an early draft of LRDD
[5] which covers existing methods for obtaining resource metadata.

Between using the HTTP Link header and host-meta, you should have full
coverage of what you are trying to do, without having to create any new


[1] http://tools.ietf.org/html/draft-nottingham-http-link-header
[2] http://www.w3.org/TR/powder-dr/
[3] http://www.oasis-open.org/apps/org/workgroup/xri/download.php/38236/xrd-
[4] http://tools.ietf.org/html/draft-hammer-hostmeta
[5] http://tools.ietf.org/html/draft-hammer-discovery-03#appendix-B

> -----Original Message-----
> From: ietf-http-wg-request@w3.org [mailto:ietf-http-wg-request@w3.org]
> On Behalf Of ???
> Sent: Friday, June 25, 2010 7:48 PM
> To: ietf-http-wg@w3.org
> Subject: FW: I-D Submission: draft-lee-httpext-metadata-00.txt
> FYI.
> ---
> Moon-Sang Lee, Senior Engineer, Ph.D.
> Convergence Software Lab., Digital Media & Communication R&D Center, 
> Samsung Electronics Co., Ltd.,
> TEL: +82-31-279-8082
> Email: sang0627.lee@samsung.com
> Wisdom begins in wonder. *Socrates*
> -----Original Message-----
> From: IETF I-D Submission Tool [mailto:idsubmission@ietf.org]
> Sent: Friday, June 25, 2010 4:34 PM
> To: internet-drafts@ietf.org
> Cc: sang0627.lee@samsung.com; sang0627.lee@samsung.com
> Subject:
> Message-Id: <20100625073403.CBA163A69A1@core3.amsl.com>
> Date: Fri, 25 Jun 2010 00:33:55 -0700 (PDT)
> ,junglok.yu@samsung.com
> Subject: Manual Post Requested for draft-lee-httpext-metadata
> Content-Type: text/plain; charset="utf-8"
> Mime-Version: 1.0
> Manual Posting Requested for following Internet-Draft:
> I-D Submission Tool URL:
> https://datatracker.ietf.org/idst/status.cgi?submission_id=24392
> Filename:	   draft-lee-httpext-metadata
> Version:	   00
> Staging URL:	   http://www.ietf.org/staging/draft-lee-httpext-metadata-
> 00.txt
> Title:		   A New Header For Metadata Exchange
> Creation_date:	   2010-06-25
> WG ID:		   Individual Submission
> Number_of_pages: 11
> Abstract:
> This document provides a mechanism by which web servers can provide 
> metadata of a web resource which is indicated by a URL.  The web 
> client like web browser can use this metadata to filter out unwanted 
> web resource or link to itself.  In addition, the web client can take 
> advantage of such metadata to provide high-level services like 
> displaying additional information about the web resource without 
> downloading it.  We expect this mechanism to enable quick access to 
> metadata of any web resource from any web client reduces overall web
traffic remarkably.
> Submitter: Moon-Sang Lee (sang0627.lee@samsung.com)
> Author(s):
> Moon-Sang Lee, sang0627.lee@samsung.com
> Jung-Lok Yu, junglok.yu@samsung.com
> Comment:
> Thank you!
Received on Sunday, 4 July 2010 05:28:53 UTC

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