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Page history last edited by Chris Messina 10 years, 4 months ago


An attachment is a files or media object that the user provides in association with an activity.

There may or may not be a meaningful relationship between the activity and the attachment, and the user may associate zero or more attachments to an activity.


The attachment(s) of an activity acts as a generic bundle of files and media objects that the user wishes to associate with an activity. Depending on your case and the actor, activity verb, activity object-type, or attachment object-type you may wish to display an attachment as a single link below an activity, or as a thumbnail or inline representation, as in a video or audio file.

An attachment is equivalent to an Atom enclosure, except that it bears several additional properties that are not provided by an the enclosure element.



<link rel="related" title=".." type="text/html" href="/...">






Prior Art



MySpace recently updated their sharing control to allow users to attach a link, photo, or video:

This results in status activities with attachments like:


Basecamp Attachments

Basecamp Attachments


Stream Attachments

Stream Attachments


  • Chris Messina
  • Rob Dolin

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