W3C home > Mailing lists > Public > public-ws-addressing@w3.org > February 2006

Re: WSA From

From: Mark Nottingham <mnot@mnot.net>
Date: Thu, 9 Feb 2006 11:54:50 -0800
Message-Id: <A40FA395-0740-4650-8FDD-4DD167A2BC52@mnot.net>
Cc: Paul Fremantle <pzfreo@gmail.com>, public-ws-addressing@w3.org
To: Mark Little <mark.little@jboss.com>

Speaking just as me...

It sounds like there are a lot of potential use cases for From.

What's less than clear is whether they're compatible; i.e., if WS-Foo  
says wsa:From should contain a URI that corresponds to the MAC  
address of your ethernet controller, WS-Bar says wsa:From should  
contain a urn:uuid for your service (as we're already seeing from our  
friends from the North, apparently), and WS-Baz says it should be  
your IP address, how do you use these specifications in a  
"composable" fashion?

Of course, From could changed to allow more than one URI, but then  
how do you pick which one is the appropriate one? E.g., if I see  
three http:// URIs in there, which one is MY From?

Smashing a bunch of different use cases into one vague semantic  
bucket isn't interoperable; it's asking for trouble. I see no reason  
why these different cases can't specify different headers to contain  
the information they need; yes, WS-Addressing is one boat that they  
could hop onto on the way to standards paradise, but there are others.


On 2006/02/08, at 4:11 AM, Mark Little wrote:

> +1
> I don't see what it adds in removing it, but I can see what it  
> removes by removing it.
> Mark.
> Paul Fremantle wrote:
>> Hi
>> I'd like to write in support of wsa:From.
>> 1) A lot of mediation (SLA provision, security checks, etc) is  
>> based on who/where the message came from. From is useful for that.
>> 2) WSA makes WS-* much more "peer-to-peer". But knowing where a  
>> message comes from is a key part of that.
>> For example we in Apache Synapse are allowing users to do custom  
>> routing based on wsa:From.
>> Paul
>> -- 
>> Paul Fremantle
>> VP/Technology, WSO2 and OASIS WS-RX TC Co-chair
>> http://bloglines.com/blog/paulfremantle
>> paul@wso2.com <mailto:paul@wso2.com>
>> "Oxygenating the Web Service Platform", www.wso2.com <http:// 
>> www.wso2.com>

Mark Nottingham     http://www.mnot.net/
Received on Thursday, 9 February 2006 19:55:01 UTC

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