Many to many objects relations in Java Google App Engine

Maybe I misunderstood this but from what I read I may have several problems creating many to many objects relations in the data store. So I hope I am wrong. Can anyone provide me with ideas on realizing such a system on GAE/J?

What 开发者_StackOverflowI need is many students can have many files (meaning Student A can have File A and Student B can have File A while Student A also can have N other different files that he may or may not share with other students). How can I implement a relatively simple DB model for Google App Engine (And please provide how to implement a "get all student files" method)?

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Here is the documentation on relationships for Google App Engine.

I hope it will help.

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The link Michael provided is to the French documentation. Here is the English version.