FeedSync, previously Simple Sharing Extensions, are extensions to RSS and Atom feed formats designed to enable the synchronization of information by using a variety of data sources. Initially developed by Ray Ozzie, Chief Software Architect at Microsoft, it is now maintained by Jack Ozzie, George Moromisato, Matt Augustine, Paresh Suthar and Steven Lees. Dave Winer, the designer of the UserLand Software RSS specification variants, has given input for the specifications.
The current version is 1.01, which was released on September 15, 2008. The 1.0 version was released on December 4, 2007. The differences between the two can be found here. FeedSync is licensed under the Creative Commons Attribution-ShareAlike License (version 2.5) and the Microsoft Open Specification Promise.
The scope of FeedSync for Atom and RSS is to define the minimum extensions necessary to enable loosely-cooperating applications to use Atom and RSS feeds as the basis for item sharing – that is, the bi-directional, asynchronous synchronization of new and changed items amongst two or more cross-subscribed feeds.[1]
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Examples
Atom feed
<?xml version="1.0" encoding="utf-8"?> <feed xmlns="http://www.w3.org/2005/Atom" xmlns:sx="http://feedsync.org/2007/feedsync"> <title>To Do List</title> <subtitle>A list of items to do</subtitle> <link rel="self" href="http://example.com/partial.xml"/> <author> <name>Ray Ozzie</name> </author> <updated>2005-05-21T11:43:33Z</updated> <id>urn:uuid:60a76c80-d399-11d9-b93C-0003939e0aaa</id> <sx:sharing since="2005-02-13T18:30:02Z" until="2005-05-23T18:30:02Z" > <sx:related link="http://example.com/all.xml" type="complete" /> <sx:related link="http://example.com/B.xml" type="aggregated" title="To Do List (Jacks Copy)" /> </sx:sharing> <entry> <title>Buy groceries</title> <content>Get milk, eggs, butter and bread</content> <id>urn:uuid:60a76c80-d399-11d9-b93C-0003939e0aa0</id> <author> <name>Ray Ozzie</name> </author> <updated>2005-05-21T11:43:33Z</updated> <sx:sync id="item_1_myapp_2005-05-21T11:43:33Z" updates="3"> <sx:history sequence="3" when="2005-05-21T11:43:33Z" by="JEO2000"/> <sx:history sequence="2" when="2005-05-21T10:43:33Z" by="REO1750"/> <sx:history sequence="1" when="2005-05-21T09:43:33Z" by="REO1750"/> </sx:sync> </entry> </feed>
RSS feed
<?xml version="1.0" encoding="utf-8"?> <rss version="2.0" xmlns:sx="http://feedsync.org/2007/feedsync"> <channel> <title>To Do List</title> <description>A list of items to do</description> <link> http://example.com/partial.xml </link> <sx:sharing since="2005-02-13T18:30:02Z" until="2005-05-23T18:30:02Z" > <sx:related link="http://example.com/all.xml" type="complete" /> <sx:related link="http://example.com/B.xml" type="aggregated" title="To Do List (Jacks Copy)" /> </sx:sharing> <item> <title>Buy groceries</title> <description>Get milk, eggs, butter and bread</description> <sx:sync id="item_1_myapp_2005-05-21T11:43:33Z" updates="3"> <sx:history sequence="3" when="2005-05-21T11:43:33Z" by="JEO2000"/> <sx:history sequence="2" when="2005-05-21T10:43:33Z" by="REO1750"/> <sx:history sequence="1" when="2005-05-21T09:43:33Z" by="REO1750"/> </sx:sync> </item> </channel> </rss>
Examples of Real World Use
There are several examples of "real world" use of FeedSync feeds to synchronize data between applications.
FeedSync Service
This prototype developer service is an implementation of HTTP based FeedSync endpoint. Applications can use HTTP GET and POST commands to synchronize feeds, where the latter performs the FeedSync merge operation on the feed hosted by the FeedSync Service.
Strong Angel III
FeedSync feeds were used extensively at the Strong Angel III exercise in August 2006 as a lightweight middleware to link applications from Microsoft, Google, ESRI and others on desktops and mobile devices.
ROME project
The comprehensive Java RSS project, ROME, contains an implementation of the FeedSync specification.
Mesh4x
Mesh4x, an open-source set of libraries, tools, applications and services for mesh-based applications, uses FeedSync as the versioning standard, and implements a Feedsync-inspired packet-based protocol to synchronize data over SMS text messages. http://mesh4x.org.
See also
References
External links
Specifications
- FeedSync for Atom and RSS.
- RSS 2.0 Specification by Dave Winer
- Frequently Asked Questions for FeedSync.
Code
- FeedSyncSamples Codeplex project
- SSE for .NET Codeplex project
- FeedSync Tutorials (written in Javascript).
Articles
- Deprecated blog entry by Ray Ozzie on Really Simple Sharing.
- visualization How Simple Sharing Extensions Will Change the Web.
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