Re: [ebxml-bp] FW: Differences between an operation and a BT

["David RR Webber" <david@drrw.info>]

Kenji,

I concur.  I keep saying over and over - the W3C never
designed or intended for WSDL to do this - its a
point-to-point linkage mechanism for processes and
data formats - designed to be specific to an implementation
scenario.

So why people think they can use it for a mission it
was never designed for without encountering
fundamental constraints and issues - baffles me.

Oh well.

DW

----- Original Message ----- 
From: "Kenji Nagahashi" <nagahashi@fla.fujitsu.com>
Cc: <ebxml-bp@lists.oasis-open.org>
Sent: Friday, May 28, 2004 8:15 PM
Subject: Re: [ebxml-bp] FW: Differences between an operation and a BT


> Anders,
>
> If I understood correctly, JJ is saying that particular WS operation
> cannot be reused by two or more different roles.
> Assume there are two roles and WSDL operation defined for each:
>
> Role A
> operation X
>
> Role B
> operation Y
>
> You cannot say "Party B invokes operation Y on party A" (even if X and Y
> are logically the same) since WSDL operations are inherently bound to
> particular role.
> In contrast, with BT, you can say either "Role A initiates BT X" or
> "Role B initiates BT X".
>
> JJ's statement "BT has no direction" might be too short :-)
> BT itself does has direction, but it can be bound to any direction
> within outer collaboration. WSDL doesn't allow this.
>
> Regards
> Kenji
>
>
> >>> Directed (A->B)                    No direction specified
> >>> (BTA
> >>>
> >>> A BT is directed since it is asymetrical with and an Initiator and a
> >>> Responder role.
> >>
> >> This statement is wrong. The roles are abstract. It is only when used
> >> in a BTA when you know the direction.
> >>
> > <awt>
> > yes, the roles are abstract. Its only when you start/enact/initiated the
> > BPSS when thay become concrete or real. But still a BT is asymetrical
> > with an abstract direction. When fitted into a BPSS using a proxy BTA
> > construct the abstract roles becomes bound to higher level roles through
> > the performs element in BTA. THis process is recursive all the way to
> > the top. i.e BPSS.
> > <awt>
>
>