How to transmit Two Instances between pages

> Hi, all
>  
> I'm trying to do something similar to the example xforms-wizard-pfc.  In
> that example, each page uses xi:include as follows:
>  
> <xf:instance>
>     <xi:include href="input:instance"/>
> </xf:instance>
> <xf:instance id="nav-instance">
>     <nav xmlns="">
>         <action/>
>   </nav>
> </xf:instance>
> to bring in initial-instance.xml which looks as follows:
>  
> <form>
>     <action/>
>     <user>
>         <firstname/>
>         <lastname/>
>         <age/>
>     </user>
> </form>
> The contents of the <action> tag determine whether to navigate back or
> forward through the pages, and each page is used to supply values for
> <firstname>, <lastname>, and <age>.
>  
> My problem is, I don't want to have the <action> tag be part of the same
> instance that I'll be submitting when my form is fully filled out.  I
> tried creating a second instance as follows:
>  
> <xf:instance>
>     <xi:include href="input:instance"/>
> </xf:instance>
> <xf:instance id="nav-instance">
>     <nav xmlns="">
>         <action/>
>   </nav>
> </xf:instance>
> (after removing <action> from initial-instance.xml); however, the 2nd
> instance does not seem to be passed in input:instance or, if it is, I
> couldn't reference it (I tried instance('nav-instance')/action but that
> syntax was not recognized in page-flow.xml).  So then I tried moving the
> <xf:instance> tags for both instances into initial-instance.xml and
> changed the include statement to look like
>  
> <xf:model>
>     <xi:include href="input:instance"/>
> </xf:model>
> hoping to get both instances with one input.  This time, I got errors
> saying prefix xf: not allowed in the xml file.
>  
> So ... is there a way to do this and I just don't have the correct
> syntax, or am I fighting a losing battle?
>  
> Thanks in advance for any help/suggestions.
>  
> Mark MacKinnon
>  
>