eating cucumbers without permission...

The objective of Simple Sharing Extensions (SSE) is to define the minimum extensions necessary to enable loosely-cooperating apps

1. to use RSS as the basis for item sharing – that is, the bi-directional, asynchronous replication of new and changed items amongst two or more cross-subscribed feeds.
   
   
2. to use OPML as the basis for outline sharing – that is, the bi-directional, asynchronous replication of outlines, such as RSS aggregators' subscription lists

Just today I decided I needed an OPML extension like this for a project. How lovely to unexpectedly find a link to it while reading about some random and completely unrelated topic.