This model is basically a ISubGraphModel that automatically assigns links to belong to groups. There are two methods, one to get the containing group for a link (if any), GetGroupForLink, and one to get all of the link data that are members of a group, GetMemberLinksForGroup.

Because membership of links in groups is automatically computed, there are no modification or updating methods in this interface.

Note that this interface is universal, because it can only assume the node data is of type System.Object. The corresponding methods in the generic model classes operate on and return a specific node data type.

Reference