ASP.NET XML Schema Builder software?

[edmicman]

Before I reinvent the wheel, does there already exist any sort of software that lets you build an XML schema (with different, possibly nested elements of simple and complex types) from a web page? I'm envisioning a web app that you "build" the xml schema from, and then can save it out (or in my case, commit to a database and store it in an xml data type field). You'd think this would have already been done, but I don't see anything useful when I search Google. Thanks!