[ogsa-bes-wg] BES spec

[David Snelling]

Karl,

To be complete your example would ned to be:

<Running>
    <Stagingin>
       <Held/>
    </Stagingin>
</Running>

Right?

I need to think more about this, but it may be ok.

Could we standardize the meaning of some of the substates, such as  
<Held/> and <Suspended/>? Then we could get standardized semantics  
anywhere. E.g.

<bes;Running>
    <ds:DavesSpecialDataMovementState>
       <bes:Held/>
    </ds:DavesSpecialDataMovementState>
</bes:Running>



On 3 Jul 2006, at 08:42, Karl Czajkowski wrote:

> On Jul 03, David Snelling modulated:
>
>> There is one thing I am concerned about and that is how do we express
>> these substates? For example we want to be able to combine the
>> concepts of StagingIn and Held without building a complex matrix of
>> all possible combinations. While at the same time, we want
>> StagingIn_Held to be a substate of StagingIn and restricted
>> accordingly, e.g. limiting what the next states can be. What does
>> this look like in XML?
>
> Maybe it shouldn't be StagingIn_Held, it should be /StagingIn/Held
> (using XPath syntax):
>
>   <stagingIn>
>      <held/>
>   </stagingIn>
>
> come on, the answer is right there in the phrase "NESTED states". ;-)
>
> The advantage here is you can use open extensibility (with the "any
> other" namepsace restriction, perhaps) to allow anyone to define
> extensions. As you mentioned, a client can ignore the inner (extended)
> content if they wish to operate more generically.
>
> I agree with your explanation of state transition rules. Note, this is
> just rephrasing the theory of hypergraphs, so people could look to
> that for references if they are worried about the ramifications.
>
>
> karl
>
> -- 
> Karl Czajkowski
> karlcz at univa.com

-- 

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     Dr. David Snelling < David . Snelling . UK . Fujitsu . com >
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