Issue #1091 resolved
The current group model in BibSonomy is flat, i.e., a group can't be a "member" of another group. We need a hierarchical model for reporting, etc.
- Each group in BibSonomy is represented by a user - we could model the hierarchy by allowing such users to be members of groups.
- To get efficient queries for the /group/*-Pages we very probably need more redundancy in the database.