Activity Streams Ontology Specification

This work is licensed under a Creative Commons Attribution License. This copyright applies to the Atom Activity Streams RDF mapping Vocabulary Specification and accompanying documentation in RDF. Atom Activity Streams RDF Mapping uses W3C's RDF technology, an open Web standard that can be freely used by anyone.

Abstract

This specification describes the Atom Activity Streams Vocabulary (AAS), defined as a dictionary of named properties and classes using W3C's RDF technology, and specifically a mapping of the Atom Activity Streams work to RDF.

Status of This Document

This document is the second draft, and the first draft to have an RDF version

See the changes section for details of the changes in this version of the specification.

Notational Conventions

In this document, the following namespace prefixes are used for the given namespace URI from the referenced specification:

Alias	Namespace URI	Specification
`aas:`	`http://xmlns.com/aas#`	Atom Activity Streams Vocabulary
`foaf:`	`http://xmlns.com/foaf/0.1/`	Friend-of-a-friend ontology
`dcterms:`	`http://purl.org/dc/terms/`	DCMI Metadata Terms
`atom:`	`http://www.w3.org/2005/Atom`	The Atom Syndication Format (, “The Atom Syndication Format,” .) [RFC4287]
`thr:`	`http://purl.org/syndication/thread/1.0`	Atom Threading Extensions (Snell, J., “Atom Threading Extensions,” September 2006.) [RFC4685]
`activity:`	`http://activitystrea.ms/spec/1.0/`	Atom Activity Extensions
`media:`	`http://purl.org/syndication/atommedia`	Atom Media Extensions
`cal:`	`urn:ietf:params:xml:ns:xcal`	xCal
`pc:`	`http://portablecontacts.net/schema/1.0`	PortableContacts
`geo:`	`http://www.georss.org/georss`	GeoRSS

The choices of namespace prefix are arbitrary and not semantically significant.

Atom Activity Streams
Atom Activity Streams Vocabulary at a glance
AAS cross-reference: Listing FOAF Classes and Properties
Acknowledgments
Recent Changes

Activity Streams

The Activity Streams Atom extensions format is work to create extensions to Atom to represent the kinds of activities that occur in social networking sites and applications such as Facebook and MySpace. This document is a mapping from that work to RDF and will follow it closely as it develops.

Here is an example of an Atom feed entry describing an activity stream. Most of the content within the tag is traditional Atom, and is the material that all popular Atom readers like Google Reader and NewzCrawler use to render the content. The and tags are drawn from the Activity Streams specification, and are the portions of the entry that applications should program against.

<entry>
  <title>Snapshot Smith uploaded a photo.</title>
  <id>http://www.facebook.com/album.php?aid=6&id=499225643&ref=at</id>
  <link href="http://www.facebook.com/album.php?aid=6&id=499225643&ref=at" />
  <published>2009-04-06T21:23:00-07:00</published>
  <updated>2009-04-06T21:23:00-07:00</updated>
  <author>
    <name>Snapshot Smith</name>
    <uri>http://www.facebook.com/people/Snapshot-Smith/499225643</uri> 
  </author>
  <category term="Upload Photos" label="Upload Photos" />
  <activity:verb>
    http://activitystrea.ms/schema/1.0/post/
  </activity:verb>
  <activity:object>
    <id>http://www.facebook.com/photo.php?pid=28&id=499225643&ref=at</id>
    <thumbnail>http://photos-e.ak.fbcdn.net/photos-ak-snc1/v2692/195/117/499225643/s499225643_28_6861716.jpg</thumbnail> 
    <caption>A very attractive wall, indeed.</caption>
    <published>2009-04-06T21:23:00-07:00</published>
    <link rel="alternate" type="text/html" href="http://www.facebook.com/photo.php?pid=28&id=499225643&ref=at" />
    <activity:object-type>
      http://activitystrea.ms/schema/1.0/photo/
    </activity:object-type>
  </activity:object>
</entry> 

Atom Activity Streams Vocabulary (AAS) at a glance

An a-z index of AAS terms, by class (categories or types) and by property.

AAS terms, grouped in broad categories.

AAS cross-reference: Listing AAS Classes and Properties

AAS introduces the following classes and properties. The RDF/XML version is linked from the top of this document.

%s %s

Validation queries

Recent Changes

Reworded slightly to change emphasis from ontology to a mapping of an existing vocabulary (the Atom Activity Streams format) to RDF. In consequence, changed the namespace.
Created RDF/XML version of spec.
Marked everything as unstable for now.
Changed literals to xsd:Strings

Atom Activity Streams RDF mapping

Namespace Document 21 September 2009 - first draft

Abstract

Status of This Document

Notational Conventions

Table of Contents

Activity Streams

Atom Activity Streams Vocabulary (AAS) at a glance

Actor types

Object types

Verb types

Context types

AAS cross-reference: Listing AAS Classes and Properties

Validation queries

Recent Changes

Previous Changes