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Title: FeedSync  
Author: World Heritage Encyclopedia
Language: English
Subject: RSS, Windows Live Mesh, Web syndication formats, List of content syndication markup languages, Windows Live Devices
Collection: Rss, Web Syndication Formats, Xml-Based Standards
Publisher: World Heritage Encyclopedia


FeedSync for Atom and RSS, previously Simple Sharing Extensions, are extensions to 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 of FeedSync for Atom and RSS specification is 1.02 can be found here. FeedSync for Atom and RSS 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.

Note that while much of FeedSync is currently defined in terms of Atom and RSS feeds, at its core what FeedSync strictly requires is:

  • A flat collection of items to be synchronized
  • A set of per-item sync metadata that is maintained at all endpoints
  • A set of algorithms followed by all endpoints to create, update, merge, and conflict resolve all items

This means that FeedSync can be implemented by almost any programming language have its metadata represented in many structured data formats.


  • Examples 1
    • RSS Feed Example 1.1
    • Atom Feed Example 1.2
    • POX Item Example 1.3
    • JSON Item Example 1.4
  • Examples of Real World Use 2
    • FeedSync Service 2.1
    • Strong Angel III 2.2
    • ROME project 2.3
    • Mesh4x 2.4
  • See also 3
  • External links 4


RSS Feed Example

  To Do List
  A list of items to do 
   Buy groceries
   Get milk, eggs, butter and bread

Atom Feed Example

  To Do List
  A list of items to do
    Ray Ozzie
   Buy groceries
   Get milk, eggs, butter and bread
    Ray Ozzie

POX Item Example

 Buy groceries    
 Get milk and eggs    

JSON Item Example

 "title" : "Buy groceries",    
 "description": "Get milk and eggs",    
  "id": "item_1_myapp_2005-05-21T11:43:33Z",    
  "updates": "1",    
  "history": [    
    "sequence": "1", 
    "when": "2005-05-21T09:43:33Z", 
    "by": "REO1750"

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, 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.

See also

External links


  • FeedSync for Atom and RSS.
  • FeedSync for Collections.
  • RSS 2.0 Specification by Dave Winer
  • Atom Specification


  • FeedSync Samples
  • FeedSync Service Samples
  • SSE for .NET Codeplex project


  • Deprecated blog entry by Ray Ozzie on Really Simple Sharing.
  • visualization How Simple Sharing Extensions Will Change the Web.
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