I'm trying to embedded one SVG DOM into the one created by the SVGGraphics2D.  Everything seems to work fine for most embedded images.  However, for a few of them I'm getting an SVGGraphics2DRuntimeException and the message is: Unable to write node of type org.apache.batik.dom.GenericProcessingInstruction.

I assume that my serializer is having troubles with one of the nodes in the embedded SVG (created from a 3rdParty app).  How can I tell which instruction it doesn't like?  I can't seem to get any more info than the message.