[xwiki-users] Class Properties Documentation?

Hi, I've been trying to find a overview/documentation on what the specifications, formats, and/or usage scenarios for the different class properties. In particular, I'm looking for a way store a list of users (currently stored in an arrayList) as the property of a class. I cannot find any documentation on how to use the properties "list of users" or "static list"... Any ideas/suggestions/links? Thanks! Holger