Dare Obasanjo wrote:
This is getting metaphysical but do they represent the same thing?
> If Alice, Bob, Dick and Jane share a link to a favorite video
> should it be treated as identical with the same atom:id? What
if they each put their own caption on the video? What if there
> are comments from their friends on each instance they have
> shared? These aren't hypothetical questions, I'm describing
> Facebook's implementation of sharing videos with friends.
While I'd concede that this is not a general solution, in Activity
Streams land we currently have an object type that is called "bookmark"
that is a reference to something else.
In this case, the thing it's "about" to goes into <link rel="related">,
which is not ideal but seems to align with current practice.
The <link rel="alternate"> goes to a page representing the bookmark, if
any, or it's just omitted completely if there is no such page.
The following URL is an example of something that might be an an
appropriate <link rel="alternate"> for a "bookmark" object.
http://ma.gnolia.com/people/Mart/bookmarks/cribonush
I suppose the general case is that when the user adds additional
metadata their entry becomes a pointer to the original item rather than
the item itself, so the id (and everything else, for that matter) is
different in this case.
