<http://schema.org/description>
"Google today announced an update to Google+ Sign-In, adding three improvements: support for all Google account types, easy migration from other auth methods, and incremental auth. All ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/google/2013/12/11/google-sign-gets-support-google-accounts-migration-auth-methods-incremental-auth/>