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Subscribe to hCard

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One of several aspects of social-network-portability implementation details regarding hcard-supporting-user-profiles.

update frequency

regular updates

How often should a subscription to an hCard regularly poll that hCard for updates (similar to the question of how often should a feed reader subscription to an RSS/Atom feed pool that feed for updates) ?

Once a day seems like a reasonable frequency. Perhaps poll adaptively, that is, when an update finds new information, perhaps check more frequently until no new information is found, and then lengthen the time between checks until reaching a once per day (per week?) frequency.

meta tag - expires

Another option would be to honor the expires meta tag.

   The date and time after which the document should be considered expired. An illegal EXPIRES date, 
   e.g. "0", is interpreted as "now". Setting EXPIRES to 0 may thus be used to force a modification 
   check at each visit. Web robots may delete expired documents from a search engine, or schedule a revisit.

event based updates

It may be useful to trigger additional updates of hCards based on a number of external events, e.g.:

see also

subscribe-hcard was last modified: Thursday, May 29th, 2008

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