Need Help On How To Pass Multiple Parameters To An Action

Hi there,
could anybody give some advice on how to configure the action to accept multiple parameters? let's say, the URL is something like this:

www.domain.com/index.php/FooController/SomeAction/params

where params could be something like

cat/id

or

cat=3/id=5

or

cat=5&id=6&foo=something

I realized that my actual configuration only accepts one numeric parameter to be handled by

public function actionFoo ($int)
{
...
}

I appreciate your help