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RE: Issue i020, subissue iv

From: Jonathan Marsh <jmarsh@microsoft.com>
Date: Mon, 7 Feb 2005 11:22:10 -0800
Message-ID: <7DA77BF2392448449D094BCEF67569A506762A6B@RED-MSG-30.redmond.corp.microsoft.com>
To: "Anish Karmarkar" <Anish.Karmarkar@oracle.com>, <public-ws-addressing@w3.org>

See below...

> -----Original Message-----
> From: public-ws-addressing-request@w3.org [mailto:public-ws-
> addressing-request@w3.org] On Behalf Of Anish Karmarkar
> Sent: Sunday, February 06, 2005 11:13 PM
> To: public-ws-addressing@w3.org
> Subject: Issue i020, subissue iv
> 
> 
> I took an action to start a discussion on issue 020, subissue iv [1] .
> This email fulfills that action item. Subissue 020 states:
> 
> "WS-Addressing talks about an Endpoint Reference, but does not say
> what
> an endpoint is. So what does an EPR refer to? WSDL also has the
> concept
> of an endpoint. What is the difference between the two, if any."
> 
> WS-Addressing Core [2] states:
> 
> "A Web service endpoint is a (referenceable) entity, processor, or
> resource to which Web service messages can be addressed."
> 
> WSDL 2.0 also defines a component called Endpoint [3] which is scoped
> to
> a specific service. It defines the details of a specific endpoint at

"Describes", not "defines".

> which a particular service is available.
> 
> Clearly (at least to me), there are instances where they mean the same
> thing, but it is also possible that they mean quite different things.
> For example, an EPR may contain the value of [address] which is a URN
> and also contains a [service endpoint] (without a designated port).
> Such
> a [service endpoint] may in fact contain multiple ports (or WSDL 2.0
> endpoints). Such an EPR would not be confined to a single WSDL 2.0
> endpoint.

Sorry, I'm missing something.  Are you suggesting that leaving off the
optional @EndpointName implies that the EPR refers simultaneously to
multiple endpoints?

> Given that most folks who read WSDL 2.0 will also read WS-Addressing
> (and vice versa), the use of the same term with different meaning is a
> source of confusion. I would like to suggest that we add wordings that
> point out that an endpoint component in WSDL 2.0 and an endpoint that
> is
> referenced by an EPR can be different beasts.
>
> Comments?

It seems to me that an endpoint is what it is.  It can be described to a
certain level of fidelity with a WSDL Endpoint component, and it can be
referenced by an EPR which also carries certain level of additional
information or metadata.  Are simply you suggesting stating that a Web
service endpoint consists of a set of semantics and behaviors, some of
which cannot currently be described by WSDL or by any metadata embedded
in an EPR?

> -Anish
> --
> 
> [1] http://www.w3.org/2002/ws/addr/wd-issues/#i020
> [2] http://dev.w3.org/cvsweb/~checkout~/2004/ws/addressing/ws-addr-
> core.html
> [3] http://www.w3.org/TR/2004/WD-wsdl20-20040803/#Endpoint
Received on Monday, 7 February 2005 19:22:19 GMT

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