[xml] is my xsd file valid?

[Andy Davidson <andy_davidson apple com>]

Hi 

I am able to use to xmllint to  validate an xml file against a xsd file.

$ xmllint --noout zoo.xml --schema zoo.xsd
zoo.xml validates

Any idea how I can validate the actual xsd file?  I have a large set of xsd files. I want to create a shell 
script that makes it easy to check the set is valid

thanks

Andy