动态（Js）替换和验证XSLTForms实例

I'm trying to manipulate an instance through Js code with no success at all, because everytime you reload the form, the instance is not working anymore if it contains 'binding' attributes in at leas one node. I know XSLT forms engine take some new values everytime it is loaded, and my -locally saved- instance files must be "revalidated", but I really can't find the way to do it.I'm trying to manipulate an instance through Js