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Discussion of the issue with Link|anyURI usage in the AS2 specification and the problems it can cause.

An old but interesting pre-specification document describing a variety of potential use cases for ActivityStreams 2.0.

Activity Streams 1.0 home page. Interesting for historical purposes. (Tagged as #activitystreams2)

This document describes the process and criteria for approving extensions for inclusion in the main Activity Streams 2.0 context document.

This specification details a profile for using Linked Data Notifications [LDN] with ActivityStreams2 [AS2] payloads in value-adding networks. A value-added network, as considered by this specification, is a network in which Web resources, for the purpose of this specification named Artifacts, are made available by nodes in the network, value is added to these Artifacts by other nodes in the network, and LDN+AS2 notifications with that regard are exchanged among network nodes.

The Activity Streams 2.0 Core Syntax defines the JSON syntax for Activity Streams. This document defines the vocabulary properties. The Activity Streams 2.0 Vocabulary defines a set of abstract types and properties that describe past, present and future Activities.

This is the AS2 OWL ontology which was abandoned in 2016 (not fully working or complete).

In the most basic sense, an "Activity" is a semantic description of an action. It is the goal of this specification to provide a JSON-based syntax that is sufficient to express metadata about activities in a rich, human-friendly but machine-processable and extensible manner. This can include constructing natural-language descriptions or visual representations about the activity, associating actionable information with various types of objects, communicating or recording activity logs, or delegation of potential actions to other applications.

This document includes errata for the Activity Streams and Activity Vocabulary documents.

A list of non-normative tutorials and commentary about Activity Streams topics. This is sometimes useful for understanding some of the quirks of the specification.