The first step would be to contact the authors of the entry.

If they agree that it is superseded by something else, the entry can be made 
empty, with an explanation/referral to whatever replaced it.

Cheers,
Gerwin

> On 06.10.2015, at 03:15, Makarius <makar...@sketis.net> wrote:
>
> What is the purpose of AFP/Lifting_Definition_Option? Isn't that already 
> superseded by an upgrade of the regular lifting package?
>
> I've come across a broken AFP/Lifting_Definition_Option several times, and 
> then spent extra time to maintain it, wondering if this is just dead code 
> anyway.
>
> Is there a procedure to remove obsolete material from the AFP?
>
>
>       Makarius
>
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> isabelle-...@in.tum.de
> https://mailmanbroy.informatik.tu-muenchen.de/mailman/listinfo/isabelle-dev


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