Abstract
The paper describes an implementation of an XML Schema validator written entirely in XSLT 3.0. The main benefit of doing this is that the validator becomes available on any platform where XSLT 3.0 is implemented. At the same time, the experiment provides a valuable test of the performance and usability of an XSLT 3.0 implementation, and the experience gained from writing this application can feed back improvements to the XSLT processor that will benefit a large range of applications.