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From Michel Drescher <Michel.Dresc...@uk.fujitsu.com>
Subject Re: [jira] Commented: (AXIS2-540) A default TransportInProtocol
Date Tue, 04 Apr 2006 01:40:04 GMT
Hi Sanjiva,

On 2 Apr 2006, at 8:38, Sanjiva Weerawarana wrote:

> On Sun, 2006-04-02 at 08:31 +0100, Michel.Drescher (JIRA) wrote:
>>     [ http://issues.apache.org/jira/browse/AXIS2-540? 
>> page=comments#action_12372822 ]
>>
>> Michel.Drescher commented on AXIS2-540:
>> ---------------------------------------
>>
>> Still, the address property of the EPR is NOT determining the  
>> transport
>>  protocol, whether WSDL is involved or not. THis is just the wrong  
>> way
>>  to do it, even if I would program against the API.
>
> I guess I don't understand ... in *most* cases, the address  
> property of
> the EPR *does* determine the protocol and the physical address as  
> well.
> In some cases (like having an explicit proxy of some sort) it  
> doesn't -
> and we have a property that can be set to indicate that address.

The fact that an EPR is by about 99% a URL does not mean you can  
extract its scheme, see that it is "http" and just go along with this.

The EPR's address property is a URI, and as such, just a string with  
a defined formatting. This string, however, is just an identifier  
with no additional sematics (as opposed to a URL, which incorporates  
a scheme/transport id, authority, etc.) An example for such  
identifying strings are XML namespaces, which are in overwhelming  
majority URLs (because they offer intrinsic uniqueness).

But still, they are just identifier, nothing more.

As an example, WSRF uses WS-Addressing to identify the resource to  
which to send the messages. It explicitly does *not* mention any  
transport layer, as WSRF is itself transport agnostic. This way, WSRF  
allows you to model your Web Service(s) so that you either offer one  
Web Service per Resource, or one Web Service for all your resources.

Does this make it clearer, what I mean?

Cheers,
Michel


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