This page can be called with parameter only=at, only=de or any other country / continent code (eu, na, sa, af, as, au, oc) e.g. only=eu.
This page can be called with parameter category=Partner.
This page must be called with parameter column=1, column=2 or column=false.
This page must be called with parameter lang=de_AT, lang=en_US or any other supported language code.