| Ontological Link | If it is essential to y that A and if the proposition expressed by A is directly about x then y ontologically depends upon x.7 |
| Linguistic Link | If it is essential to y that A and if A contains a term that directly refers to x then y ontologically depends upon x. |
| Referential Link | The proposition expressed by a sentence A is directly about x whenever A contains a term that directly refers to x. |