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From "Ford, Mark" <mark.f...@ll.mit.edu>
Subject Re: BPEL assignment question
Date Tue, 03 Feb 2009 18:33:29 GMT
I went through this exercise a week or so ago and wasn't able to get Xquery working off of
the 2.0 trunk (Build 87). I don't know when Xquery support was added, but I'm reasonably sure
that you have to use the 2.0 trunk.

Don't start with your own simple process. Instead, look at the Xquery test cases that ODE
has and see if you can get those to run. If you can, then follow those examples. I couldn't
get them to work but I haven't followed up with the latest build or filed a bug report. The
errors I had were on deployment - some bogus message about an attempt to reference an undeclared

Here's the link I got last time I asked:


On 2/3/09 1:15 PM, "Jackson, Douglas" <douglas.s.jackson@siemens.com> wrote:

I have not been able to get the xquery stuff to work.  I created an extremely simple BPEL
to test it.  I am attaching a zip file with all
of the files from the process.  I would appreciate it if someone could
tell me where I am going wrong.  (The commented out from clause works)
The process throws an Uninitialized variable for me.  I built the ode from the trunk.  I also
built off the 1.2 branch with the same results.  What is the minimum version of Ode in which
this would work?
Thanks in advance!

-----Original Message-----
From: Ford, Mark [mailto:mark.ford@ll.mit.edu]
Sent: Monday, January 26, 2009 8:00 AM
To: user@ode.apache.org
Subject: Re: BPEL assignment question

My guess is that you need to wrap the expression within a CDATA or escape the XML.

On 1/24/09 6:52 PM, "Jackson, Douglas" <douglas.s.jackson@siemens.com> wrote:

I do get some warnings that I cannot explain at bpel compile time - I set the expressionLanguage="...xquery1.0"
on the process node and on the <from> node:
WARN - GeronimoLog.warn(92) | Unrecognized element in BPEL dom: {http://xxx/yyy}c-info

WARN - GeronimoLog.warn(92) | null:449: warning: [XPath20Syntax] The string "
          " is not a valid XPath 2.0 expression: empty string

WARN - GeronimoLog.warn(92) | Unrecognized element in BPEL dom: {http://xxx/yyy}a-request

-----Original Message-----
From: Jackson, Douglas [mailto:douglas.s.jackson@siemens.com]
Sent: Saturday, January 24, 2009 12:06 PM
To: user@ode.apache.org
Subject: RE: BPEL assignment question

Thank you Karthick and Mark for your responses!

I followed your advice, but now the variable that I am assigning the XQuery value to says
it is uninitialized when I refer to it in another copy just after the copy that set the variable.
 There are no errors from the XQuery or BPEL prior to referring to the variable in the subsequent
copy.  Is there anything I can do to figure out what is going wrong?
I am going to try to simplify the XQuery (removing variable references) to see if that makes
any difference.

Any debugging advice would be appreciated.

-----Original Message-----
From: Karthick Sankarachary [mailto:sankarachary@intalio.com]
Sent: Friday, January 23, 2009 3:27 PM
To: user@ode.apache.org
Subject: Re: BPEL assignment question


I couldn't agree more with Mark's recommendation to use XQuery for
constructing XML nodes, whether it be an element, attribute or what have
you. And, yes that feature has been pretty well tested.

For more details, please refer to the
constructors<http://www.w3.org/TR/xquery/#id-constructors>section in
the XQuery spec. It lets you not only write static XML fragments,
but also build dynamic XML fragments on the fly.


On 1/23/09, Ford, Mark <mark.ford@ll.mit.edu> wrote:
> You should look at XQuery for this use case. I haven't tested with ODE yet
> but I saw a post from a while back that the trunk supports XQuery with the
> following namespace:
> urn:oasis:names:tc:wsbpel:2.0:sublang:xquery1.0
> Your example below would look like this in XQuery:
> <from expressionLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xquery1.0">
>    <c-info xmlns="http://xxx/yyy">
>       <c-id>{$unique-id}</c-id>
>       <client-id>{$client-id}</client-id>
>       (: other elements go here :)
>    </c-info>
> </from>
> The text between the curly braces is executable and will produce the
> results you're looking for. This is a very simple example of a literal style
> XQuery expression. I find this a much better way of constructing elements.
> Often times you can collapse many different copy operations into a single
> operation which greatly simplifies the coding and maintenance of the
> process.
> On 1/23/09 2:16 PM, "Jackson, Douglas" <douglas.s.jackson@siemens.com>
> wrote:
> Hi!
> I am trying to create a complex element in an assignment without first
> creating a literal element and subsequently filling in values.
> I tried an assignment like the following:
>         <from>concat('&lt;c-info xmlns="http://xxx/yyy"&gt;',
>                     '&lt;c-id&gt;', $unique-id, '&lt;/c-id&gt;',
>                     '&lt;client-id&gt;', $client-id, '&lt;/client-id&gt;',
>                     '&lt;type&gt;', 'Type', '&lt;/type&gt;',
>                     '&lt;owner&gt;',
> $req-msg.req-part/p:r-info/p:user-name, '&lt;/owner&gt;',
>                     '&lt;group&gt;',
>                          $req-msg.req-part/p:r-info/p:group,
>                     '&lt;/group&gt;',
>                   '&lt;/process-info&gt;')</from>
> But Ode interpreted it as:
> <?xml version="1.0" encoding="UTF-8"?>
> <c-info xmlns="http://xxx/yyy">&lt;c-info xmlns="http://xxx/yyy
> "&gt;&lt;c-id&gt;1232736236359-63&lt;/c-id&gt;&lt;client-id&gt;cmid&lt;/client-id&gt;&lt;type&gt;Type&lt;/type&gt;&lt;owner&gt;fred&lt;/owner&gt;&lt;group&gt;cgroup&lt;/group&gt;&lt;/c-info&gt;</c-info>
> This would expand to a lot of code with literal + replacement...
> I guess I could write an extension function that would convert the string
> to a node...
> Ode could add a new form of <from> like <literal-with-replacement> that
> allowed the variables to be substituted. :)
> -Doug.

Best Regards,
Karthick Sankarachary

Mark Ford
MIT Lincoln Laboratory
244 Wood Street
Lexington MA 02420
(781) 981-1843

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