I know there are quite some threads talking about validating XML file against its XML schema, such as : [validate-xml-using-libxml](https://stackoverflow.com/questions/3646689/validate-xml-using-libxml) and [xml-schema-validation-with-relaxng](https://stackoverflow.com/questions/258462/xml-schema-validation-with-relaxng)

So if there is a simple Perl module on CPAN that can test this with minimal code, then that would be very fantastic to know.