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uf:flock 2008/09/05 09:14 uf:flock 2009/11/18 13:53 current
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-A flock is a list of [[Flockr]]s as generated by means of [[Proximities|a proximity function]].+====== Flock ======
-The list changes dynamically as the input to the proximity function changes (e.g. because of buddies joining, leaving, updating their profile, being added or deleted).+A flock is a list of [[Flockr]]s defined in terms of [[Proximities | a characteristic function ]] that determines which users belong to the flock. 
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 +The list changes dynamically as the input to the characteristic function changes (e.g. because of buddies joining, leaving, updating their profile, being added or deleted)
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 +In other words, while the characteristic function can be regarded as an "intensional" representation of a group of friends, the flock is the "extensional" representation of that group. For example, if ''f'' is a flock of "all of my friends who are older than 25" (an intensional description), and the friend list is "[Alice (26), Bob (22), Carol (24)]", then the flock contains only Alice (an extensional representation of the group) 
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 +=== Implementation === 
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 +Conceptually, a flock is a list of flockrs. Technically, a flock is implemented as a list of profiles. From the profiles, the flock can acquire the flockr's unique username. Given the username, the flock can acquire a far ref to the flockr via its own "owner" flockr.
 
 
 
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