Re: [wsbpel] Issue 103 - How to write a propertyAlias for a messageType?

[Francisco Curbera <curbera@us.ibm.com>]

Yuzo,

Isn't proposal B actually what is in the spec right now? Maybe I am missing
something.

B is also consistent with the direction in which we closed 103, essentially
recognizing that each message part is an independent XML infoset and
refraining from moving into a model where queries across multiple parts
would be enabled.

As you can tell, I am happy with B.

Paco



                                                                                                                                        
                      Yuzo Fujishima                                                                                                    
                      <fujishima@bc.jp.        To:       wsbpeltc <wsbpel@lists.oasis-open.org>                                         
                      nec.com>                 cc:                                                                                      
                                               Subject:  Re: [wsbpel] Issue 103 - How to write a propertyAlias for a messageType?       
                      03/16/2005 01:05                                                                                                  
                      AM                                                                                                                
                                                                                                                                        




Hi,

How do we write a propertyAlias for a messageType?

Now that we have passed the proposal for Issue 103
with $var.part (or $var_part) amendment,
a property alias query  can not contain anything to
specify a part.

Probably we need something here to fix the problem.
Below are some ideas:

A. Introduce a special variable "source" (or other
proper name.). Bind $source to the data from which
the property value is derived.

Eg.
<propertyAlias propertyName="a:prop"
                messageType="b:msgTyp">
   <query>
     $source.part1/some/element/here
   </query>
</propertyAlias>

B. Add messagePart attribute to propertyAlias element.

Eg.
<propertyAlias propertyName="a:prop"
                messageType="b:msgTyp"
                messagePart="part1">
   <query>
     /some/element/here
   </query>
</propertyAlias>
(Must a query start with "/"?)

With B, query can be applied only to one part.
With A, you can write something like
concat($source.part1/some/element, $source.part2/another).
I prefer A.

Yuzo Fujishima
NEC Corporation


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