Together with the value of the link DB should keep the information about all the objects where this link is stored and their respective paths.
Use case
Indexes
On updating the value of the link it should be possible to update this value in the respective index. As data in the indexes are accessible by path, the link should know, which object contains it by this path.
BackRefs
It is not an announced feature, but if it will be implemented, it is great to be able to access all the objects, having this link by the path.
Together with the value of the link DB should keep the information about all the objects where this link is stored and their respective paths.
Use case
Indexes
On updating the value of the link it should be possible to update this value in the respective index. As data in the indexes are accessible by path, the link should know, which object contains it by this path.
BackRefs
It is not an announced feature, but if it will be implemented, it is great to be able to access all the objects, having this link by the path.