Updating instance data in XPL

> Hi,
>
> I would like to find out more about how the following use case  
> described in the OPS documentations works:
>
> "View and Model with XML Submission, Case 2"
> http://www.orbeon.com/ops/doc/reference-page-flow#d161927e2245
>
> I am working on a XForms-based editor that needs to:
>
> Step 1: take an ID (part of instance data) input via URL (http://
> url?id=xxxx)
> Step 2: retrieve form content (identified by ID) from a database  
> via another URL (REST)
> Step 3: populate the form with the content (rest of instance data)  
> and get it ready for editing.
>
> This seems to correspond with the use case stated in the  
> documentation.
>
> I have done steps 1 and 2 using the following page flow and default  
> submission:
>
> <page path-info="/editor" model="load-data.xpl"
>     default-submission="formModel.xml"  view="editor.xsl" >
>         <setvalue ref="/instance/id" parameter="id"/>
> </page>
>
> with the following element in the form view:
>
> <xforms:model xmlns:xforms="http://www.w3.org/2002/xforms">
>     <xforms:instance>
>             <xsl:copy-of select="doc('input:instance')"/>
>      </xforms:instance>
>     ......
> </xforms:model>
>
> and a "prologue" load-data.xpl to retrieve the form content from a  
> database. But I am stuck at Step 3.
>
> Question - how do you:
> 1. update the instance data in XPL, and
> 2. output the instance data back to the form view?
>
> I thought passing instance data is implicit.. in that as long as it  
> is updated in the XPL, you can use doc('input:instance') to access  
> it. But this seems not to be case as described in the OPS  
> documentation: "...the model declares an instance output. This  
> allows the model to modify the submitted XML instance..." .
>
>
>
> Boon
>
>
>
> -----
> Boon Low
> System Developer, EGEE Training
> UK National e-Science Centre
> http://homepages.ed.ac.uk/boon
>
>
>
>
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> wws
>
>

> Hi,
>
> Solved this by using the following parameters at the beginning of the  XPL.
>
>     <p:param name="instance" type="input"/>
>     <p:param name="instance" type="output"/>
>
> and used a XUpdate processor with the following output.
>
>     <p:output name="data" ref="instance"/>
>
> Hope this is may be useful to you..