AVT issues with sourcing an instance

Hi, this is probably a simple issue, but ...

I am evaluating Orbeon forms as an alternative for some significant recodes of XsltForm and betterform pages. In running some tests, I found the AVT code below passes the literal "{...}" rather than the substituted value.

<xf:instance id="ID" resource="http://localhost:8080/exist/apps/testform/testOrbeon.xq?ID={instance('fr-form-instance')/section-1/grid-1/control-4}"/>

The specified instance node contains data. What I am testing is pretty straightforward - a form accepting url parameters and retrieving specific information from various sources based upon the input parameters.

Apologies if there is a simple solution that I am not seeing!
Thanks,
Don

Hi Don,

Indeed AVTs are not supported there. What would the evaluation context be? Typically, it is the root element of the first instance, but what if you are loading the first instance? So , instead, for a case like this you'll need to use a submission, and run it on `xforms-model-construct-done`, which, I know, it a bit verbose. Would that work for your use case?

-Alex

Yes, that works Alex. Thanks. The code that got the concept working was:
            <xf:action event="xforms-model-construct-done">
               <xf:send submission="getRecord"/>
            </xf:action>
            <xf:submission id="getRecord" method="post"
                           resource="http://localhost:8080/exist/apps/testform/testOrbeon.xq?ID={xxf:get-request-parameter('ID')}"
                           ref="instance('record')"
                           replace="instance"
                           instance="record">
               <xf:action event="xforms-submit-error">
                    <xf:message>Submit Error Status: Resource-uri: <xf:output value="event('resource-uri')"/> Response-reason-phrase: <xf:output value="event('response-reason-phrase')"/> Value: <xf:output value="event('response-status-code')"/>
                    </xf:message>
                </xf:action>
            </xf:submission>

Perfect Don, and thank you for the confirmation.

-Alex