mp2: processing a subrequest with HTML::FillInForm

[Stephen Howard]

I have a form validator PerlResponseHandler (using Data::FormValidator) 
that needs to repopulate a form upon failure.  Problem is, the original 
form is not generated by the handler, but by other pages on the site.  
My thinking is that I ought to be able to do a lookup_uri and pass it a 
filter that can repopulate the html correctly, but the online docs for 
filters is failing me. 

The lookup_uri documentation says that it takes an Apache2::Filter 
object, but nowhere can I find information on how to create one of 
these.  Whatever filter I build I'll need to be able to pass into it 
data specific to the parent request in order to repopulate the html form 
correctly.  How do I do this?

thanks,
- Stephen