Documents by E. Leppanen
2006, RFC4660: Functional Description of Event Notification Filtering
2007, RFC4827: An Extensible Markup Language (XML) Configuration Access Protocol (XCAP) Usage for Manipulating Presence Document Contents
2008, RFC5263: Session Initiation Protocol (SIP) Extension for Partial Notification of Presence Information
2008, RFC5264: Publication of Partial Presence Information