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xp requirement document specifies headers

From: Eric Prud'hommeaux <eric@w3.org>
Date: Mon, 22 Jan 2001 15:48:49 -0500
To: xml-dist-app@w3.org
Message-ID: <20010122154849.G17696@w3.org>
I noticed that the xp requirements document now defines and requires
a header [1]. Due to a limitation of two participants from an
organization, I have not participated in the teleconferences or face
to face meetings. However, I don't believe that there is a paper trail
in xml-dist-app [2] documenting consensus on adopting this
terminology/constraint from the May 2000 SOAP note [3].

Starting with a strawman like SOAP is a good way to accelerate and
ground a working group such as xp, however, it enhances the risks that
folks will not "think out of the box". Headers/body/footers is not the
only protocol construction that provides extensibility and
modularization.

Adopting the terminology of "blocks" [4], it is easy to imagine
other, less constraining organizations of blocks to indicate
processing order, precedence, and intended recipient. For instance,
these attributes may be communicated via attributes in the block
element, association lists in a manifest, or scoping tags. The latter
describes the header/body organization adopted by SOAP except that
in SOAP, the SOAP-ENV:Body [6] conveys the intended SOAP-ENV:actor
(recipient of the block) and SOAP-ENV:mustUnderstand (see [7]).

I believe the working group should consider whether these symantics
are always and will always be coexistentent. Otherwise, it may, for
instance, be useful to treat all blocks like the headers in a SOAP
envelope, capable of separately defining actor and mustUnderstand.  I
may also be adopting the SOAP mentality to a fault here. Perhaps there
are much cooler ways to design the block assembly that I can't
concieve of.


1 http://www.w3.org/2000/xp/Group/xp-reqs-05#fig2
2 http://lists.w3.org/Archives/Public/xml-dist-app/
3 http://www.w3.org/TR/2000/NOTE-SOAP-20000508
4 http://www.w3.org/2000/xp/Group/xp-reqs-05#g350
5 http://www.w3.org/TR/2000/NOTE-SOAP-20000508#_Toc478383497
6 http://www.w3.org/TR/2000/NOTE-SOAP-20000508#_Toc478383503
7 http://www.w3.org/TR/2000/NOTE-SOAP-20000508#_Toc478383504

-- 
-eric

(eric@w3.org)
Received on Monday, 22 January 2001 15:48:49 GMT

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