IHM_DATASET_GROUP_LINK category provides the list of datasets present in a particular group.
loop_ _ihm_dataset_group_link.dataset_list_id _ihm_dataset_group_link.group_id 1 1 2 1 3 1 4 1 5 1 1 2 2 2 3 2
loop_ _ihm_dataset_group_link.dataset_list_id _ihm_dataset_group_link.group_id 1 1 2 2 3 3 4 4 5 5