Sorry I was not clear,
I meant you should not have to write the plmxml file manually, I expected you to be able to get it out of your PLM system or another tool directly.
Datasmith can read a plmxml file, but at the moment can only load reference files that are supported by datasmith CAD: for instance Catia, JT, Step, prt… Sadly no obj or fbx.
This is why in your case it would be faster to do a python code to parse a csv file and import your obj.
the transfrom node is most likely the 4x4 transform matrix for the node.