Fastest way check xml well formed, and pinpoint problems for Windows Developer

Just wondering if somebody could suggest the quickest tool for the situations where you know somebody committed some invalid XML and you want to find it really fast.

Right now I've been us开发者_JS百科ing XML Copy Editor.

Any other suggestions? I will eventually put validation commit hooks to prevent people from committing invalid .xml files.

Thanks

Personally I use xmllint and I'm happy with it. Thought it is a command line tool.

Open it using Internet Explorer.
If it finds any non-compliance will point the first failure.