[ZODB-Dev] How to do something similar to sql unique?

[Michael Zimmermann]

I hope this post

currently I am developing a small application used for bibliography 
managment. There, publications are stored as objects of a publication 
classs with the title, author.... as attributes to this object. For 
storage the zodb is used.

Now, I do havethe following problem:
For the ui I need to have a list of all authors (or titles or whatever), 
i. e. something like the unique constraint available in sql.

To do this, do I have to iterate over all object, create a list of all 
entry values and "uniquify" it?

Or what is the best solution for this problem?

-- 
cu,
    Michael

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