Puppet users - Apr 2012 - accessing a variable within a previously declared instance of a defined type

I''m trying to define a static media server that uses a common website 
layout (e.g. with directories `etc/`, `log/`, `html/`, etc.), as well as an 
nginx config that will get included into a host-wide nginx config.  The 
site''s nginx config needs to make use of the doc root that gets defined
by
the declared `layouts::website` resource.

So, what I''d like to do is something like this:


    class sites::static ($sites_dir) {

        $domain = "static.example.com"

        layouts::website {$domain:
            base_dir => $sites_dir,
            name => $domain,
        }

        nginx::siteconfig {$domain:
            domain => $domain,
            doc_root => $layouts::website[$domain]::doc_root,
        }
    }

Which could then be used by declaring:

    class {''sites::static'': sites_dir =>
"/opt/sites"}


However, the above fails because the `$layouts::website[$domain]::doc_root` 
part is invalid.  I''ve tried various alternatives here, unsuccessfully.

From what I''ve read thus far, it seems that what I''m asking
for is not
possible (though I would be interested in any pointers to discussion on the 
topic if this is something that''s been suggested before).  Any
suggestions
on how can I accomplish the stated goal of using a base layout that then 
needs to be used by various bits that will populate content within that 
base layout?

Thanks,
Gary

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