[ebxml-cppa-negot] Re: BSI distinguishing success, failure,and transition condition s

["Himagiri(Hima) Mukkamala" <himagiri@sybase.com>]

Marty,

Sybase's current implementation (Web Services Integrator)
providing BPSS support
has the ability to parse the payloads and make transition decisions
based on either payload elements or XPath expressions
to be evaulated over the business document.

BPSS also has the ability to provide transitions based on
conditionExpressions
and to evaulate these expressions the documents have to be parsed
and validated by the engine. This is the functionality  used in the
negotiation
BPSS instance.

-hima

Martin W Sachs wrote:

>
>
>
>
> Dipan,
>
> Thank you for the advice.  So, what I need to do is to express the
> condition expression as an XPATH predicate pointing into the message
> payload to an element or attribute whose value distinguishes among success,
> failure, and transition. Logically, that makes sense.
>
> Is there a BSI implementer reading this list who can say if it is practical
> for the BSI to process the payload to the point where it can look inside
> the payload? Presumably this means fully parsing (with validation) the
> payload into the DOM tree or some other internal object structure. Is this
> in fact something that BSI implementations already do?
>
> Regards,
> Marty
>
> *************************************************************************************
>
> Martin W. Sachs
> IBM T. J. Watson Research Center
> P. O. B. 704
> Yorktown Hts, NY 10598
> 914-784-7287;  IBM tie line 863-7287
> Notes address:  Martin W Sachs/Watson/IBM
> Internet address:  mwsachs @ us.ibm.com
> *************************************************************************************
>
>
>                       "Anarkat, Dipan"
>                       <DAnarkat@uc-            To:       Martin W Sachs/Watson/IBM@IBMUS, ebxml-cppa-negot@lists.oasis-open.org, ebtwg-
>                       council.org>              bps@lists.ebtwg.org
>                                                cc:
>                       08/14/2002 09:45         Subject:  RE: BSI distinguishing success, failure, and transition condition       s
>                       AM
>
>
>
> Marty,
>    The value of the condition expression MAY be a previously exchanged
> document. In that case the expressionLanguage should be set to
> 'DocumentEnvelopeLanguage' in the BPSS instance and the value of
> 'expression'  should then be the name of the 'DocumentEnvelope' exchanged.
>
>    Depending on the Business Collaboration you may want to specify more
> complicated conditions for 'Success' , 'Failure' or 'Transition'. In that
> case you may want to specify your condition expression using 'XPATH' as you
> 'expressionLanguage' with an XPATH predicate in the 'expression'attribute.
>
>    Typically you would have guard conditions expressed in OCL, on the input
> and output transitions from the BTA, in your Business Collaboration models
> (as per UMM). When you map the Business Collaboration models (in UMM) to a
> corresponding BPSS process specification you would map the OCL expressions
> to XPATH predicates in the 'ConditionExpression' element.
>
>    Any incoming message in a conversation would then be validated against
> the condition expression in the BPSS process specification, if specified.
> The BSI would then advance the conversation to the appropriate
> collaboration state based on the evaluation of the condition expression on
> the message recieved. I think this is how the BSI would behave.
>
> Regards,
>
> + dipan
>
> Dipan Anarkat
> Systems Analyst, Standards Development
> Uniform Code Council, Inc.
> Tel: (609)-620-4509
> http://www.uc-council.org/
>
> -----Original Message-----
> From: Martin W Sachs [mailto:mwsachs@us.ibm.com]
> Sent: Wednesday, August 14, 2002 9:20 AM
> To: ebxml-cppa-negot@lists.oasis-open.org; ebtwg-bps@lists.ebtwg.org
> Subject: BSI distinguishing success, failure, and transition conditions
>
> How does a BSI know if the exit condition from a BusinessTransaction
> Activity is Success, Failure, or Transition?  The value of the condition
> expression in these elements is the value of the name attribute of some
> BusinessDocument element.  How does the BSI know which condition expression
>
> the incoming message matches?  I can' find anything in the ebXML message
> header that contains this attribute value.
>
> Unless the BSI knows whether the incoming message satisfies the Success,
> Failure, or Transition condition, it can't track the choreography.
>
> Regards,
> Marty
>
> *************************************************************************************
>
> Martin W. Sachs
> IBM T. J. Watson Research Center
> P. O. B. 704
> Yorktown Hts, NY 10598
> 914-784-7287;  IBM tie line 863-7287
> Notes address:  Martin W Sachs/Watson/IBM
> Internet address:  mwsachs @ us.ibm.com
> *************************************************************************************
>
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