W3C home > Mailing lists > Public > xml-dist-app@w3.org > February 2001

RE: [AMG] Thoughts about path and intermediaries

From: Dick Brooks <dick@8760.com>
Date: Fri, 9 Feb 2001 09:47:04 -0600
To: "Martin Gudgin" <marting@develop.com>, "Williams, Stuart" <skw@hplb.hpl.hp.com>, "Henrik Frystyk Nielsen \(E-mail\)" <frystyk@microsoft.com>, "Jean-Jacques Moreau \(E-mail\)" <moreau@crf.canon.fr>, "John Ibbotson \(E-mail\)" <john_ibbotson@uk.ibm.com>, "Krishna Sankar \(E-mail\)" <ksankar@cisco.com>, "Lynne Thompson \(E-mail\)" <Lynne.Thompson@unisys.com>, "Marc Hadley \(E-mail\)" <marc.hadley@uk.sun.com>, "Mark Baker \(E-mail\)" <mark.baker@Canada.Sun.COM>, "Nick Smilonich" <nick.smilonich@unisys.com>, "Oisin Hurley \(E-mail\)" <ohurley@iona.com>, "Scott Isaacson \(E-mail\)" <SISAACSON@novell.com>, "Yves Lafon \(E-mail\)" <ylafon@w3.org>
Cc: <xml-dist-app@w3.org>
Gudg wrote:

>Conversely if the XML Protocol Layer does NOT support the notion of a path
>then it becomes inherently single-hop. In this latter case path becomes an
>application level construct and not part of the core definition of the XML
>Protocol. This would simplify the core definition of XML Protocol while
>still allowing applications to layer intermediary processing on top of XML

This is virtually identical to the discussion occurring within ebXML
regarding intermediaries.
A point-to-point protocol can be used in a "iterative" fashion between
multihop exchanges and this
makes the protocol/state machine significantly simpler to implement. The
trade-off is the loss of "protocol"
support for administrative and other functions that cross intermediaries.
However, as you indicated,
some of this functionality can be supplied as an application level

A good metaphor to help understand the relative complexities of the two
approaches is to compare IP routing(packet switching) to SS7 routing
(circuit based - used for call setup between telco switches).

Dick Brooks
Group 8760
110 12th Street North
Birmingham, AL 35203
Fax: 205-250-8057

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Received on Friday, 9 February 2001 10:53:10 UTC

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