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RE: Question on SCXML algorithm

From: Jim Barnett <Jim.Barnett@alcatel-lucent.com>
Date: Mon, 17 May 2010 17:11:06 -0700
Message-ID: <E17CAD772E76C742B645BD4DC602CD8102ED0CD0@NAHALD.us.int.genesyslab.com>
To: "ENGELMANN Bruce" <Bruce.ENGELMANN@3ds.com>, <www-voice@w3.org>

It looks like you have come across a bug in the algorithm that has been fixed in the latest working draft, which was published just last week.    Let us know if this version fixes your problem:  http://www.w3.org/TR/scxml/ 


Please let us know about you experience with the spec.  We have tried to keep SCXML from being voice-specific, and are very interested in non-voice applications.


-          Jim


From: www-voice-request@w3.org [mailto:www-voice-request@w3.org] On Behalf Of ENGELMANN Bruce
Sent: Monday, May 17, 2010 5:58 PM
To: www-voice@w3.org
Subject: Question on SCXML algorithm




I am the CTO of DS SIMULIA Corporation. I am looking at adopting SCXML for a controller for multiphysics simulation - a far cry from the voice applications which reference SCXML. I am very excited about the emerging standard as Haral state charts are quite useful for some of our applications.


I have a question on the "Algorithm for SCXML Interpretation from the Working Draft 29 document. In procedure addStatesToEntry, when evaluating the block isCompoundState(s), there is a call to getDefaultInitialState(s). I cannot find this function defined in the document. Presumably it returns a single value of a state id. However, in my understanding of SCXML that the target of the sole transition of an <initial> element can be any decendant (not necessarily direct) of the composite state. If the composite state has parallel grandchildren then can't there be multiple targets within that parallel region? If so, then how do I interpret getDefaultInitialState(s) in the algorithm.


It may be my lack of understanding of SCXML but I sure would appreciate some help here. I am very excited from what I see so far and this seems very applicable to our domain. I would be glad to update you on our progress in the future.


Thanks for your help in advance.





Cordialement / Best regards, 


SIMULIA Product Dev & Research
Office: +1 401276 4460
Bruce.ENGELMANN@3ds.com <mailto:Bruce.ENGELMANN@3ds.com> 
Dassault Systèmes I www.3ds.com <http://www.3ds.com>  

Visit us at: www.simulia.com <http://www.simulia.com> 
SIMULIA - Dassault Systemes Simulia Corp. 166 Valley Street - 02909-2499 PROVIDENCE - United States




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Received on Tuesday, 18 May 2010 00:11:52 UTC

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