Hi Peter,
Sorry for the delay in getting back to you.
With regards to, currently we do not have support to import the Serialized XML (from Silverlight) into Asp.NET WebDiagram control and save it as image by using DiagramWebControl.ExportDiagramAsImage()method.
Assumption:
We assume that your requirement is to serialize the Diagram into XML and save into DataBase and then render the XML as Image.
Details about XML serialization in Silverlight and save in Database.
Link:
http://forums.silverlight.net/t/131175.aspx/1 However, we will create a sample based on your requirement. We will update you with the sample on 9th April 2012.
Please let us know if you have any concerns,
Regards,
Ramya