Raised when a value inside the entity this referenced entity is referencing has been changed. This event contains the information about the particular change.

Event which is raised when a contained element has been changed. For observers it's not important which one, they have to re-examine the path for their own requirements to see whether it's still valid.

Raised when the implementing element has been removed from its container

Raised when a value inside the valuetype this referenced valuetype is referencing has been changed. This event contains the information about the particular change.