Validate an XSD Schema?

I'm writing an XML schema (an XSD) to describe the format our partners should send us data in.

And I'm having a hard time finding a tool that can validate the XSD schema file that I have written.

The best way I have found so far is to first write an example input XML file and then try to validate that with the XSD. But that doesn't feel like a best practice maneuver.

So, how should I validate an XML schema?