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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.

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.

This page documents known AS2 extensions and best practices for using other namespaces in AS2.

This document lists the terms used for the ActivityStreams 2.0 protocol and its stable extensions, and provides a namespace so each term has an HTTP IRI. This document is merely a W3C-internal document. It has no official standing of any kind and does not represent consensus of the W3C Membership.