Title: Message
My point is that,
for interoperability purposes, a BPEL process should provide at least one
BP-compliant portType/binding/port. In addition to that, it could provide any
other non-compliant elements.
The "at least one"
requirement assures that we would not get into the embarrassing situation where
two companies build two brand new BPEL processes (not talking about legacy Web
services here) and still the two processes would not be able to talk to each
other (not too good for BPEL's reputation ...).
Ugo
-----Original Message-----
From: Furniss, Peter
[mailto:]
Sent: Thursday, October 02,
2003 10:04 AM
To: Ugo Corda; BPEL OASIS
Subject: RE:
[wsbpel] Issue - 72 - ( was RE: [wsbpel] Issue 47 and WS-I BP
1.0)
How
on earth is that to be enforced ? Are we considering an abstract case, a bpel
engine, a process script or a particular running instance ? Does a BPEL
script that has one BP-compliant partnerlink become illegal if one day it's
bound (via appropriate WSDL) to MQ ? Must a BPEL engine fault an attempt
to use it to map between a non-BP 1.0 client and a differently non-BP 1.0
service, mangling between the messages to make them acceptable to
each.
Peter
-----Original
Message-----
From: Ugo Corda [mailto:]
Sent: 02 October 2003 17:54
To: Furniss, Peter; BPEL
OASIS
Subject: RE: [wsbpel] Issue - 72 - ( was RE: [wsbpel] Issue 47
and WS-I BP 1.0)
Please keep in
mind that saying that BPEL should offer
a BP-compliant service only means that at least one WSDL port
offered by the BPEL process has to be BPEL-compliant. The BPEL process could
provide additional non-compliant ports and still be considered
BP-compliant.
Ugo
-----Original Message-----
From: Furniss, Peter
[mailto:]
Sent: Thursday, October
02, 2003 2:30 AM
To: BPEL OASIS
Subject: [wsbpel]
Issue - 72 - ( was RE: [wsbpel] Issue 47 and WS-I BP
1.0)
I would strongly support Postel's law in general,
but I'm not sure it applies so easily to BPEL.
The detailed content and format of particular
messages sent from (be conservative) or received by (be liberal) a BPEL
process are obviously subject to Postel's law, but that's a matter for the
binding and the involved protocols, and their
profiles.
The equivalent for BPEL would first appear to be,
as Ron says, be liberal in the web services you use, conservative in
the ones you offer. However, the use/offer polarity is determined by
the WSDL MEP's in use. In the case of asynchronous
relationships, where there are paired port types one-way
operations, there isn't any obvious distinction as to which side
is doing the specifying and which is obediently following
it. Even for request/response patterns, it isn't invariably the case
that the server has freedom to choose (and thus to obey BP 1.0) and the
client has to follow the dictates of the server (whether it obeys BP 1.0
or not), which is the basis of Postel's law.
For BPEL, or indeed for business protocols in
general, which side has the initiative is probably determined by other
features (which side has more economic clout or more deployed
implementation or less intelligent developers or got there first).
Postel's law applies as something like "be generous in what you demand of
others, providing there is unambiguity; be precise in how you follow the
demands of others, even if it doesn't seem entirely
reasonable".
Peter
-----Original Message-----
From: Ron
Ten-Hove [mailto:]
Sent: 01 October
2003 21:48
To: Eckenfels. Bernd
Cc: BPEL
OASIS
Subject: Re: [wsbpel] Issue 47 and WS-I BP
1.0
Perhaps we should invoke
Postel's law, with respect to basic profile conformance. To promote
interoperability, we should be as permissive as possible when dealing
with (other) web services, but as conformant as possible when creating
our own (BPEL engine provided) web services.
I
realize this falls mostly on implementations to worry about, but the
basic profile does contain a lot of restrictions and clarifications for
the "abstract" service model that may be of interest.. The ban on
operation overloading might be slightly simplifying, for example.
Anyway, a quick scan of the BP didn't reveal
anything scary to me. It seems to me that WS-I BP 1.0 compliance will be
an implementation worry, but as a technology that will rely on
interoperation of our SOAP infrastructure, we ought to encourage (but
not mandate) BP compliance.
-Ron
Eckenfels. Bernd
wrote:
Hello Ugo,
I think it is not good to speak about violation if an
implementation is able to communicate with an larger number of
systems.
Perhaps we should chnage this: "conformant BPEL engines must be
able to provide and consume Web Services according to BP 1.0a
specification. Engine should not provide Web Services with HTTP SOAP
binding other than BP1.0 conformant.
Actually I see the point of requiring BP1.0 support as a
conformance rule, but I dont see a point of restricting engines to
that, even if it applies.
Mit freundlichen Grüßen
Bernd
Eckenfels
Chief
Architect
--
SEEBURGER AG - Edisonstr.1 , D-75015 Bretten,
Germany
Fax: +49 (0)7252 96-2400 - Phone: +49 (0)7252
96-1256
mailto: - http://www.seeburger.de
-----Original Message-----
From: Ugo Corda [mailto:]
Sent:
Wednesday, October 01, 2003 8:28 PM
To: Satish Thatte;
Prasad Yendluri; Eckenfels. Bernd
Cc: BPEL
OASIS
Subject: RE: [wsbpel] Issue 47 and WS-I BP
1.0
Right,
RPC literal would be fine, but RPC encoded would be in
violation.
-----Original Message-----
From:
Satish Thatte [mailto:]
Sent:
Wednesday, October 01, 2003 11:23 AM
To: Ugo Corda;
Prasad Yendluri; Eckenfels. Bernd
Cc: BPEL
OASIS
Subject: RE: [wsbpel] Issue 47 and WS-I BP
1.0
So for
instance the RPC encoded services bound to SOAP/HTTP would be in
the “in scope but in violation”
category?
From:
Ugo Corda [mailto:]
Sent: Wednesday,
October 01, 2003 11:18 AM
To: Satish Thatte; Prasad Yendluri;
Eckenfels. Bernd
Cc: BPEL OASIS
Subject: RE: [wsbpel] Issue
47 and WS-I BP 1.0
Let
me clarify point 4 (sorry, I mislabeled it as 3) in relation to
point 1.
I
think we should distinguish services that are not compliant with
BP 1.0 from those that are simply out of scope for BP
1.0.
If
I have a Web service that is not bound to SOAP/HTTP, then I would
say it is out of scope for BP 1.0, so it's OK for BPEL to interact
with it.
My
point 4 is about services that are within the scope of BP 1.0 and
still do not comply with its requirements.
Ugo
-----Original
Message-----
From: Satish Thatte [mailto:]
Sent: Wednesday, October 01,
2003 11:09
AM
To: Ugo Corda; Prasad
Yendluri
Cc:
BPEL OASIS
Subject: RE: [wsbpel] Issue
47 and WS-I BP 1.0
I doubt
that we can mandate BPEL to be used with BP 1.0 compliant
services only especially given the answer to 1 assuming it is
correct, and given that there are many services today that are
not compliant (e.g., RPC encoded
ones).
From:
Ugo Corda [mailto:]
Sent:
Wednesday, October 01, 2003 10:55 AM
To: Satish Thatte; Prasad
Yendluri
Cc:
BPEL OASIS
Subject: RE: [wsbpel] Issue
47 and WS-I BP 1.0
I
see a few separate issues/questions connected to the
relationship of BP 1.0 and BPEL.
1- Would
BP 1.0 be restricting BPEL to the point that some of BPEL's
functionality would not be available?
I
cannot think of any such restriction off the top of my
head.
2-
Would the fact that BP 1.0 only addresses the SOAP/HTTP binding
imply that also BPEL should be limited to that type of
binding?
I
don't think that anybody would imply that.
3-
Should a BPEL process be offered as a Web service that is BP 1.0
compliant?
My
answer would be yes.
3-
Would it be fair to limit BPEL use to interacting with BP 1.0
compliant Web services only?
My
personal answer would be yes. But I am a member of WS-I, and I
understand other people might have different
answers.
Ugo
-----Original
Message-----
From: Satish Thatte [mailto:]
Sent: Wednesday,
October 01, 2003 10:39 AM
To: Prasad
Yendluri
Cc:
BPEL OASIS
Subject: RE: [wsbpel]
Issue 47 and WS-I BP 1.0
For
the benefit of the non-expert could post a salient example
please? Specifically, a BPEL usage pattern that would
not work if BP 1.0 is followed but would work if any WSDL 1.1
portType is allowed. In other words, is BP 1.0 a
restriction on the WSDL artifacts we use or potentially on
BPEL itself?
From:
Prasad Yendluri [mailto:]
Sent:
Wednesday, October 01, 2003 10:11 AM
To: Satish Thatte
Cc: BPEL
OASIS
Subject: Re: [wsbpel]
Issue 47 and WS-I BP 1.0
The sections 5.5 and 5.6 in the basic
profile (http://www.ws-i.org/Profiles/Basic/2003-08/BasicProfile-1.0a.htm)
are devoted to binding aspects but, several major sections
including section 4, other sections of 5 address abstract
aspects of WSDL, which is a pretty large portion. All those
are applicable BPEL IMO.
Prasad
Satish Thatte
wrote:
Most of the BP 1.0
directives are binding related. BP also forbids outbound
operations which BPEL does not use. Can someone identify
a directive in BP 1.0 that actually affects
BPEL?
Satish
