Blender exporter doesn't export physical constraints?

Tried to export several rag-doll scenes with same result - lost constraints every time... Is it somehow possible to export these? Or the only variant is creating constraints in code?
PS. I also found no mention of constraints in exporter format description...

It is not possible to export theses at the moment... however should be pretty simple to add it. If you are intrested simply code it and send me a template projectin order to test and debug this feature. If its stable enough I will add it to the core.