RE: [wsbpel] Issue 13 - Updated Proposed Resolution - propertyAlias query usage

["Chris Keller" <chris.keller@active-endpoints.com>]

Another place that an XPath expression is used with no way to override
the expression language is in the propertyAlias extension element for
WSDL.  The proposal should be modified to include propertyAlias query
usage.  Below is the proposed change for propertyAlias.

Current syntax:

<wsbp:propertyAlias propertyName="QName" messageType="QName"
part="NCName" query="queryString"/>

Proposed Syntax:

<wsbp:propertyAlias propertyName="QName" messageType="QName"
part="NCName">
  <wsbp:query queryLanguage=".."?> ?      query goes here
  </wsbp:query>
</wsbp:propertyAlias>

Note: If the queryLanguage element is omitted it is assumed to be XPath
1.0.

-----Original Message-----
From: rkhalaf [mailto:rkhalaf@watson.ibm.com] 
Sent: Wednesday, December 10, 2003 11:41 AM
To: wsbpel@lists.oasis-open.org
Subject: [wsbpel] Issue 13 - Updated Proposed Resolution]

  The proposal is to replace things with expressions and queries  from 
being an attribute to being an element. This would affect <from>, <to> ,

<propertyAlias>, and conditions.  This would gear up for using other 
languages for querying that may have a structured syntax. An example is 
the upcoming XQueryX, a proposal for XQuery using XML syntax.   The case

for string queries is also shown below.

With elements instead of attributes, we can allow one to override the 
default query/expression languages locally. The proposal allows for  
optional query/expressionLanguage attributes on queries and conditions 
that can locally override the global default.

Current syntax:

<wsbp:from variable="ncname" part="ncname"? query="queryString"?/>

<wsbp:link ... transitionCondition="..." />
<wsbp:targets joinCondition="...">
.. the same for switch's case, and the whileCondition

Proposed syntax

<wsbp:from variable="ncname" part="ncname"?>
  <wsbp:query queryLanguage=".."?> ?      query goes here
  </wsbp:query>
</wsbp:from>

For example, an XPath 1.0 query would be encoded:

<wsbp:from variable="ncname" part="ncname"?>
  <wsbp:query>
  /shipNotice/ShipNoticeHeader/shipOrderID
  </wsbp:query>
</wsbp:from>

Conditions:

<wsbp:source ... >
      <wsbp:transitionCondition 
expressionLanguage=".."?>...</transitionCondition>?
</wsbp:source>

and

<wsbp:targets>
    <wsbp:joinCondition expressionLanguage="..."?>...</joinCondition> ?
     <wsbp:link.... />
</wsbp:targets>

.. the same for switch's case, and the whileCondition

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