Cache with Onload

I wonder, is it possible to create a cache file when used with onload?


For example, I'd like the [onload;file=templates/default/layout/nav/nav-[var.tplid].tpl.php] to be cached.

Hope I'm making sense?

Slight correction, I'd like the file nav-filename.tpl.php to be cached

You can simply manage this cache file (create/refresh/let) before to merge the main template.

Another way is to use an 'onformat' function with parameter 'subtpl' (like in the manual) in order to manage the contents of the sub-template as if it was a normal template.