Nested collection model or any hierarchical model in Entity Framework 4.2

Question

I would like to know if there is some kind of plugin for managing nested db set design in entity structure 4.2

http://en.wikipedia.org/wiki/Nested_set_model

I have hierarchical data to solve, and, in my opinion, the Nested set is a more efficient way to work.

I know that there is something in the Php doctrine (ORM) and Hope is something similar in EF.

Thanks.