Set<RelationshipKind> kinds = registeredKinds.get(group);
if (kinds == null) {
kinds = new HashSet<RelationshipKind>();
registeredKinds.put(group, kinds);
}
RelationshipKind kind = RelationshipKind.newInstance(group, name);
kinds.add(kind);
} else {
removeRelationshipKind(contrib);
}
}