I am proposing to register application/vnd.dia+xml as the media type for diagrams created by Dia, a diagramming tool hosted at http://live.gnome.org/Dia I have made multiple attempts to contact the lead developer of Dia, have received no response, so I am advancing this proposal myself for the benefit of both the Dia project and its users (which included me). Proposed media type: application/vnd.dia+xml The Dia file format is based on XML, so all considerations regarding XML apply. Is this the best media type to use? I chose this because the similar application, Visio, appears to have registered application/vnd.visio (http://www.iana.org/assignments/media-types/application/vnd.visio). Please comment. If there are no objections, I will prepare and submit the registration request.