保存服务器中xml文件的更改

I have a web page which correctly load an xml file into DOM and use that information to create a table on the html with javascript, now I want to create an admin page where you can change the xml file content easily for every person but i don't know which tool, library or function I can use to create a xml document back from de DOM and save change in the server.I have a web page which correctly load an xml f