[1] ActivityIntent ( ()) <https://akihikodaki.github.io/activity-intent/index>
[2] ActivityPub Extension for Intent ( ()) <https://akihikodaki.github.io/activity-intent/activitypub.html>
[3] URL Scheme for Activity Streams 2.0 ( ()) <https://akihikodaki.github.io/activity-intent/scheme.html>
[4] Intent Class in Activity Streams 2.0 Vocabulary ( ()) <https://akihikodaki.github.io/activity-intent/vocabulary.html>