[wp-hackers] updating guid when changing permalinks

[John Joseph Bachir]

>> WordPress uses the permalink as the GUID, but any unique identifier 
>> would do. A post's GUID should never change.
>> 
>> That it stops every post from being seen as "new" by RSS readers when 
>> the permalink structure changes is the most practical reason why.
>
> Right. We don't change the GUID on published posts even if the slug 
> changes. The code is in wp_insert_post().

Ooohh I see. Where else is GUID used? I suppose the only requirement is 
that the GUID be universally unique. Which means I shouldn't use slugs at 
all because they could be reused on a different blog. I guess some 
combindation of the lyceum installations domain name and the post ID in 
the database would suffice?

John
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