Comment 28 for bug 873470

(In reply to comment #4)
> What other mime-types have that problem?

None, just like the .odp mime has no problem either.

> I can't see any, so it's not that bad a solution.

The solution is bad because the zip inheritance is perfectly fine from a shared-mime-info point of view (it represents mime types, after all).
If the problem is not letting a specific user-level file archiver application see openoffice documents as zip, then let's find an application-level solution for this (and any other potentially similar case in which you want to handle a mimetype but not some mimes inheriting from it, for any reason you want).
I personally don't think there's nothing wrong in having some file archiver opening any kind of zip files, if the user wants to.