| ERROR | group must have name or ref but not both |
| CAUSE | ref or name attributes are either both missing or have both been specified. |
| ACTION | Specify either ref, name, but not both. |
| ERROR | group must have name or ref but not both |
| CAUSE | ref or name attributes are either both missing or have both been specified. |
| ACTION | Specify either ref, name, but not both. |