W3C home > Mailing lists > Public > www-ws-desc@w3.org > March 2004

Re: WSDL Import/Include Locations

From: Yaron Y. Goland <ygoland@bea.com>
Date: Mon, 01 Mar 2004 15:02:17 -0800
Message-ID: <4043C0F9.1010309@bea.com>
To: Martin Gudgin <mgudgin@microsoft.com>
Cc: Arthur Ryman <ryman@ca.ibm.com>, www-ws-desc@w3.org

Which means that if one did decide to use two imports to pull in the 
same data for the purpose of robustness then if both imports succeed, 
besides wasting time and resources, the WSDL would be illegal since the 
same data would be pulled in twice.

Therefore it would seem appropriate to make it possible to list multiple 
URIs on a single import with the explicit semantics that one should try 
them in a random order (for load balancing purposes) until one works.

	Yaron

Martin Gudgin wrote:

> I didn't say the spec prohibited two or more imports with the same namespace 
> attribute. I said it prohibited two or more imports that resulted in components 
> in a given symbol space with duplicate names.
>  
> I believe the spec already states that an import is a necessary condition in 
> order to reference components in a given namespace that is not the target namespace
>  
> Gudge
> 
>     --------------------------------------------------------------------------------
>     *From:* www-ws-desc-request@w3.org [mailto:www-ws-desc-request@w3.org] *On
>     Behalf Of *Arthur Ryman
>     *Sent:* 20 February 2004 20:24
>     *To:* www-ws-desc@w3.org
>     *Subject:* Re: WSDL Import/Include Locations
> 
> 
>     Gudge,
> 
>     I looked at the spec and the schema and I couldn't see where we prohit two
>     or more <import>'s that have the same namespace attribute.
> 
>     Also, in the case of diamond inheritance, you will end up indirectly
>     importing the same WSDL into the component model twice. We allowed this by
>     saying if a component is defined twice or more then the definitions must be
>     equivalent.
> 
>     I have been looking at imports and includes in the spec and I think we need
>     to clarilfy the situation. If a WSDL directly references a component from
>     another namespace, then that namespace MUST be declared in a top level
>     import, whereas any components that are directly or indirectly included or
>     imported do become part of the component model. The component model
>     "forgets" where they come from, yet we do care about where they come from by
>     requiring top-level imports. We seem to have two levels at which we discuss
>     correctness, namely at the document level (where we have imports and
>     includes) and at the component model level (after imports and includes are
>     resolved). This is analogous to PSVI. We seem to have the notion of a Pre
>     and Post Import/Include Processing Component Model.
> 
>     Arthur Ryman,
>     Rational Desktop Tools Development
> 
>     phone: 905-413-3077, TL 969-3077
>     assistant: 905-413-2411, TL 969-2411
>     fax: 905-413-4920, TL 969-4920
>     intranet: http://w3.torolab.ibm.com/DEAB/
> 
>     www-ws-desc-request@w3.org wrote on 02/18/2004 06:05:01 PM:
> 
>      >
>      >
>      > Martin Gudgin wrote:
>      > Actually I think our current spec already prohibits multiple imports
>      > ( or includes ) of components with duplicate names. So while you
>      > could do two imports of the same namespace, it would only work if
>      > all the components in the second had names different from those in the
>     first.
>      >  
>      > Gudge
Received on Monday, 1 March 2004 19:47:59 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Monday, 7 December 2009 10:58:30 GMT