Logical Structure for questions, that can be uploaded/replaced by users (not developers)

Hi All, I would like to implement Logical decision trees, that can be replaced by users (e.g. if A=true then if B=false; set flag =’red should be replaced by if A=true then if C=true; set flag =’red’), that can be imported and exported (so controlled by the users NOT the developers). I thought of importing an xml file and then create this kind of logic structure would do the job (and just loop over it mapping some strings (if “A=true” : set A=true) to concreate fields or procedures, e.g. “setflag”->execute set flag=’red’).   Any ideas what the simplest approach would be (e.g. is xml format the right choice)? Or maybe you have even some examples? Thank you in advance, Andreas  
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