[TYPO3-mvc] How to clear page cache when object property has changed

[g4-lisz at tonarchiv.ch]

hi there,

we use two actions "show" and "edit". the show action is cached.
now when we edit a property of a domain object (e.g. "city"), this 
change of course should be reflected in the show action. i.e. the page 
cache has to be cleared. is there an easy way to achieve this without 
having to clear the whole pages cache?

i'm think about calling some "clearPageCache($pid)" function in the 
editAction method - is there something similar?

thanks,
till