A first version of our Zong! Webviewer Server is now online. It allows to open MusicXML files via the internet, renders them to PNG images, MP3 and OGG audio files and computes the cursor positions for playback visualization. There is a demo page which demonstrates the features for some given sample files, but also allows to open your own MusicXML files. The server is based on the Zong! libraries, Jetty and the H2 Database Engine.
As you can see, the server just provides a backend which can be controlled by sending JSON encoded commands. The next step is to create an HTML frontend (HTML 5 and JavaScript) that uses this backend to present a user-friendly online viewer for MusicXML files.
The Zong! Blog 