why not using SimpleXmlElement when saving simulator document ?

[houcemL]

https://github.com/eureka2/G6K/blob/6ab4e0caaacf1d292cd2c74f49f04d54c7048bc4/src/G6K/Model/Simulator.php#L3027 hello

First thank you for sharing this wonderfull and intelligent project !

I was reading the code and i'm wondering why you did not use a new SimpleXmlElement and so on for all childs .. to finaly generate the xml ? otherwise did you try to use some serialization components / libraries such as sf serialization or JMS ?