anchor.diff:                          "page_count": 14,
                           "previous_page": 14,
                           "next_page": 2,
  -                        "first_href": "/groups?page_size=2",
  -                        "previous_href": "/groups?page=14page_size=2",
  -                        "next_href": "/groups?page=2&page_size=2",
  -                        "last_href": "/groups?page=14&page_size=2"
  +                        "first_href": "/user_groups?page_size=2",
  +                        "previous_href": "/user_groups?page=14page_size=2",
  +                        "next_href": "/user_groups?page=2&page_size=2",
  +                        "last_href": "/user_groups?page=14&page_size=2"
                       }
                   },
                   "user_groups": [{
  
positive.code: 
      [UserGroup][]
  
  ## Remove a Link [/groups/{id}/links/{link_type}/{link_ids}]
  Allows links to users, projects, or collections to be removed. Removed
  projects and collections are deleted. Removed users have their
  membership set to 'inactive'.
  
negative.code:                         "type": "projects"
                      },
                      "users.user_groups": {
                          "href": "/user_groups?user_id={users.id}",
                          "type": "user_groups"
                      },
                      "users.subjects": {
  