[Closed] Please give some advice on serialization of max objects

You can create a method which goes through any nodes parameters/properties and writes them out to xml taking in account their class and types and then read them back and assign all the data back using execute. It is a bit of work at he beginning but then you can write almost anything to XML, it is basically what we are doing here although we went a step ahead and really filter out how we write any specific data.

the first draft of your data writing system did write anything no matter the type of data.