Reuse a variable in OSB XPATH expression editor

Question

I have a problem with replacing activity in Oracle Service Bus.
I created a variable with the follow content
<response>
<operationResponse name="OPERATION1" result=""/>
<operationResponse name="OPERATION2" result=""/>
<operationResponse name="OPERATION3" result=""/>
<operationResponse name="OPERATION4" result=""/>
</response>
For each operationResponse I call a businessProxy that invokes an external webservice. If this call is made with success, I replace `result=""` with `result="1"`.
I have created a replace activity like this:
<con3:replace contents-only="true" varName="responseElement"> <!-- var responseElement = <response>.*</response> -->
<con2:id>_ActionId-3886365367816551561--27a55993.13f0a38ab8f.-7c95</con2:id>
<con3:location>
<con2:xpathText>./operationResponse/@result</con2:xpathText>
</con3:location>
<con3:expr>
<con2:xqueryText>"1"</con2:xqueryText>
</con3:expr>
</con3:replace>
After running this program, all the attributes "results" are replaced by "1", if the businessService is called successfully.
The problems is that I need to replace the attribute "result" only for the element operationResponse that have the attribute "name" equal to the operationResponse that invokes the businessService.
I have created a variable called operationName that contains the current response/operationResponse. I used ./operationResponse[@name=$operationName]/@result.
The OSB XPATH expression editor is throwing the follow error:
Variable "$operationName" used but not declared for expression
Can anyone help with this?

Answer 1

Hi, XPath and XQuery are conceptually different. XPath expression can not have variables while an XQuery expression can have a variable inside the XPath when the expression is bound to a variable.
To work around the issue, instead of using the condition in XPath expression inside replace you should write the XQuery expression of REplace in such a way that it results in what you need.
For ex. if I take the example above:
say the content of $body is as below:
<soap-env:Body>
<aaa>
<bbb>
<ccc>A</ccc>
<key>1</key>
</bbb>
<bbb>
<ccc>B</ccc>
<key>2</key>
</bbb>
</aaa>
</soap-env:Body>
and you wanted to replace values of ccc to X for any bbb elements which have key=1(and you have saved a variable called keyCheck with value '1' earlier in the flow), then you could do the following:
Replace contents of  . in body with
<aaa>
for $bbb in $body/aaa/bbb
if ($bbb/key/text() = $keyCheck)
then
<bbb>
<ccc>X</ccc>
<key>{$bbb/key/text()}</key>
</bbb>
else
$bbb
</aaa>