I was just discussing a serialization schema with Gavin, and I used the term "object graph", to which he didn't understand what I meant. I though this was a fairly common term so I was quite stunned to see it wasn't even on Wikipedia. Well it is now
http://en.wikipedia.org/wiki/Talk:Object_graph, and hopefully it will become permanent soon.
Object Graph
A view of an object system at a particular point in time. Whereas a normal data model details the relationships between objects, the object graph relates the instances. i.e. Instead of a Car having a relationship to a wheel, MyCar has four relationships to four different Wheels(FrontLeft, FrontRight, BackLeft, BackRight).
Examples
Examples from google
See also
Data Model