Each META ACTIVITY SITE
| K | must be the site of one and only one META ACTIVITY |
| K | must be performed by one and only one META ORGANISATION SITE |
| K | or must be performed at one and only one META PLACE |
Meta Model Class Menu
| K | must be the site of one and only one META ACTIVITY |
| K | must be performed by one and only one META ORGANISATION SITE |
| K | or must be performed at one and only one META PLACE |