RE: D-AG004: Ensures platform independence

Hi Abbie,
 
I think platform independence can be better ensured without
introducing a dependence on JAVA.  At the lower level, endpoints
are communicate over socket connections, and socket semantics
are widely supported in many languages: C/C++/C#, JAVA, ...
IMHO a better approach to platform independence is through better
messaging, such as adopting a ubiquetous message format, say SOAP.
 
Joe Hui
Exodus, a Cable & Wireless service
=============================
----Original Message----- 
From: Abbie Barbir [mailto:abbieb@nortelnetworks.com] 
Sent: Tue 3/19/2002 7:48 AM 
To: michael.mahan@nokia.com; Austin.D@ic.grainger.com 
Cc: www-ws-arch@w3.org; Christopher Ferris 
Subject: RE: D-AG004: Ensures platform independence



 Mike and all,
  
 Per the last teleconference call D-AG004 is still open and must be closed by the next call.
 In this e-mail I attempt to close the issues regarding the design Goal.
 The goal as stated 
 " 
 D-AG0004 
 ensures platform independence of web services components in a way that does not preclude any programming model nor assume any particular mode of communication between the individual components 

 "

 In my original e-mail I have riased some issues regarding the goal, but unfortunatly I did not get good track.
  
 So here are my $.002,
  
 Discussion:
 ------------------
  
 In order to ensure platform independence, we need the following:
 1. Adopt the use of platform independent languages such as JAVA. 
 2. Have very well defined interfaces to web components that are general and could be invoked using appropriate protocols.
 3. Try to use XML and other markup techniques that ensures the ability to invoke web components using variaty of protocols.
  
  
 The design goal can coexist with D-AG0003: is sufficiently extensible and  with D-AG0005:provides simplicity and ease-of-use that does not impose high barriers to entry for users of web services. In my opnion, the appropriate designs for platform independence interfaces can help the above two stated golas.
  
  
 Furtheremore, Some issues were raised regarding the interdependecne of D-AG004 and D-AG011. Here D-AG011 is restated:
  
 CURRENT GOAL STATEMENT: 
 Web Services are consistent with the existing web and its heterogenous environment and distributed architecture to the greatest extent possible.
  
 Discussion -2:
 -------------------
  
 I really do think that the requirement of platform independence does contradict the above design goal. In my view designing for platform independence must be consistant with D-AG011. So in this regard, D-AG011 can feed into D-AG004.
  
 Crtitical Success Factors:
 ----------------------------------
  
 The design goal can be achieved through the insistance on using platform independent development tools and languages such as XML and JAVA. The interfaces to web components must also be properly designed.
  
 Derived Requirements:
 --------------------------------
 1. Consistent definition of web components
 2. Good definition of web components Interfaces.
 3. Use XML based protocols for invoking the web components.
  
  
 Current Recommendation:
 --------------------------------------
 The goal should stay as written
  
  
 cheers
 abbie
  
  
 
 

  -----Original Message-----
  From: michael.mahan@nokia.com [mailto:michael.mahan@nokia.com]
  Sent: Thursday, March 14, 2002 10:48 AM
  To: Austin.D@ic.grainger.com; Barbir, Abbie [CAR:1A00:EXCH]
  Cc: www-ws-arch@w3.org
  Subject: RE: D-AG004: Ensures platform independence
  
  
  Hi Abbie,
   
  In message [1], I questioned whether platform independence goal is separate from D-AG0011. Can you comment on that.
   
  Thx, Mike
   
   
  [1] http://lists.w3.org/Archives/Public/www-ws-arch/2002Mar/0181.html <http://lists.w3.org/Archives/Public/www-ws-arch/2002Mar/0181.html> 

   -----Original Message-----
   From: ext Austin, Daniel [mailto:Austin.D@ic.grainger.com]
   Sent: March 12, 2002 05:41 PM
   To: 'Abbie Barbir'
   Cc: 'www-ws-arch@w3.org'
   Subject: RE: D-AG004: Ensures platform independence
   
   
   Hi Abbie,
    
       The text of this goal was quoted directly from the group charter, so we have to be careful about amending it. But I think these are good questions. What are the answers?
    
   Regards,
    
   D-

    -----Original Message-----
    From: Abbie Barbir [mailto:abbieb@nortelnetworks.com]
    Sent: Tuesday, March 12, 2002 1:19 PM
    To: www-ws-arch@w3.org
    Cc: Abbie Barbir
    Subject: D-AG004: Ensures platform independence
    
    


    This message kicks off discussion on goal 4, "ensures platform independence of web services" 

    Please comment on goal wording, success factors, relation to other goals, etc. 

    The goal as stated 
    " 
    D-AG0004 
    ensures platform independence of web services components in a way that does not preclude any programming model nor assume any particular mode of communication between the individual components 

    " 

    Discussion: 
    -------------- 
    I think that the goal as stated provides a nobel idea that software designers would like to comply with. However, it seems to me that 

    1. A proper definition of the term components must be provided, where the line would be drawn on where and how the platform idependence could be achieved.

    2. In addition, does plateform independence means the independence from the actual operating system and/or programming language. 

    3. In order to be able not to preclude any programming model, what kind of interface do we assume for web services components?

    4. In order not to assume any mode of communications between the individual components, how would data be exchanged (if need be ?)

    
    Other issues: 
    ------------- 

    5. Is this redundant with D-AG0003: is sufficiently extensible to allow for future evolution of technology and of business goals 

     when combined with D-AG0005:provides simplicity and ease-of-use that does not impose high barriers to entry for users of web services 

    Critical success factors 
    ------------------------ 

    How platform independence could be measured, verified and achieved? and who will verify that? 

    cheers 
    abbie

Received on Tuesday, 19 March 2002 14:34:33 UTC