attr_rewrite replaced by ulang

Hi Guys We are in the process of setting up a test environment so we can migrate from 2.x to 3.x Reading the documentation, attr_rewrite is obsolete and should be replaced by ulang... I have this in my sites-available/default authorized { realmchange ... } realmchange is referenced back to:- attr_rewrite realmchange { attribute = realm searchin = packet searchfor = ".+" replacewith = %{Called-Station-Id} maxmatches = 1 new_attribute = yes } 1. How do I write this in ulang? 2. Do I put the ulang section under authorize { ... } section? Many thanks, Gabriel