> Hi,
>
> If you have an XForms model containing two (or more) data instances, what is
> the recommended way to then perform an XML submission which requires bits of
> data from both instances?
>
> For example,
>
> <xf:instance id="alpha">
>   <alpha>
>       Some data...
>   </alpha>
> </xf:instance>
>
> <xf:instance id="beta">
>   <beta>
>       Some more data...
>   </beta>
> </xf:instance>
>
> <xf:instance id="result">
>   <result>
>       Some data...
>   </result>
> </xf:instance>
>
> As far as I am aware the submission mechanism only allows you to reference
> data from a single instance e.g.
>
> <xf:submission id="do-alpha" method="post" resource="alpha"
> ref="instance('alpha')" replace="instance" instance="resullt"/>
>
>
> Therefore when you need to process data from two separate instances I
> believe it is necessary to copy data from one instance to the other thus
> duplicating data. This is really awkward and gets messy very quickly.
>
> Is there an easier way to do this? For example is there a way to aggregate
> the data from multiple instances when you submit? For example something
> like:
>
> <xf:submission id="do-alpha-beta" method="post" resource="alpha-beta"
> ref="aggregate('data', instance('alpha'), instance('beta'))"
> replace="instance" instance="resullt"/>
>
> This approach doesn't work at the moment, but would seem to be a nice way of
> creating the required instance data on-the-fly.
>
> One other alternative I could think of would be to aggregate the data
> sources when the page is constructed, but this is just pushing the problem
> to the XPL rather than the XForm code.
>
>
> Any thoughts on this would be much appreciated.
>
> Regards,
> Neil
>
>
>
>
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>
>
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>