MSS is a web metrics syndication format. Its name is an acronym for metrics syndication standard. MSS is a dialect of XML. All MSS files must conform to the XML 1.0 specification, as published on the World Wide Web Consortium (W3C) website. The goal of MSS is to provide sites with a standard way to publish easily ingestible metrics relating to its community and content.

Here is the schema that shows the documented structure of a MSS feed.
http://developer.trendrr.com/mss/mss-schema.xml

Here are some sample MSS feeds.
http://trendrr.com/graphs/timeseries-mss.seam?id=385755
http://trendrr.com/trends/searchResults-mss.seam?q=trendrr

MSS 0.1 is offered by Trendrr and Wiredset under the terms of the Attribution/Share Alike Creative Commons license.