W3C home > Mailing lists > Public > public-ws-addressing@w3.org > December 2004

Re: i014 - Metadata Update/Reconciliation: a proposal

From: Hugo Haas <hugo@w3.org>
Date: Wed, 15 Dec 2004 15:55:29 +0100
To: Doug Davis <dug@us.ibm.com>
Cc: public-ws-addressing@w3.org
Message-ID: <20041215145529.GI21750@w3.org>
* Doug Davis <dug@us.ibm.com> [2004-12-15 08:57-0500]
>   If two different client applications are given the same EPR (same w.r.t. 
> address and ref.props) can we really assume they have the same 
> metadata/wsdl.... ?

It all comes down to how we define and use [address] and [reference
properties], the properties we get from them being a function of the
constraints they are placing on their use.

Right now, they are defined as:

  same [address]/[reference properties] ⇒ same metadata
  different [address]/[reference properties] ⇏ same metadata

With this definition, *if* you want to have different metadata, *then*
you have to use a different [address]-[reference properties] pair. And
if you do have identical pairs, then you can draw such a conclusion.

> As an example, what if based on the client's permissions the WSDL
> for a particular endpoint will differ - perhaps one has Admin access
> and the other doesn't.  In this case can WSA really claim that the
> two EPRs are the same w.r.t. metadata/WSDL and messages they accept?
> No.
[..]

I think it depends on how the service is built and exposed.

Two clients may be talking to the same service, with the same
[address]/[reference properties]. One client may have access to more
operations than the other, because it has different access privileges.
The service is the same for both, except that the lower-privileged
client is not authorized to use certain operations, and may not even
be aware of them.

So, in both cases, the WSDL is the same, it's just that one is
authorized to do certain things and the other one isn't.

Another way to do this would be to have two different, logically
separate, interfaces, and use different [address]/[reference
properties]. In this case, we have different metadata indeed.

Cheers,

Hugo

-- 
Hugo Haas - W3C
mailto:hugo@w3.org - http://www.w3.org/People/Hugo/

Received on Wednesday, 15 December 2004 14:55:30 GMT

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