<http://schema.org/description>
"Yes, we knew it was going to happen eventually. Sparrow is officially being open sourced by its creators as they leave for Google post-acquisition. Update: Only the open source componets ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/insider/2012/07/27/rip-sparrow-the-beloved-mail-client-is-open-sourced-for-personal-use-only/>