au_subgroups

Allows creation of groups within groups

Properties of Subgroups

only members of the parent group can join a sub-group
sub-groups are fully qualified groups in their own right, may have sub-groups of their own
infinite depth of sub-groups
breadcrumb navigation on group pages shows path from parent to current group
groups owner block contains link to parent group
groups owner block contains link to subgroups
when users leave a parent group, they are removed from all subgroups

Events

Creating a subgroup

subgroup automatically inherits colors/backgrounds from parent if group custom layout is used

Deletion of a group

if the group has subgroups, all subgroups will be deleted
content within subgroups can be reassigned to the original owner, to the parent group, or deleted

Updating a group/subgroup

if the visibility of the group becomes more restrictive, any subgroups contained by the group will be updated to the more restrictive visibility.