Is it possible to validate an XML document against an XSD and produce a non english output.

Can I do something with XSLT and validation of an XML. I can use schematron to create all the rules but that will be to timeconsuming because I already have the XSD's. When I use the RelaxNG language I get an English output, the Saxon Validation only outputs English.

You will have to enquire about the capabilities of specific products in this area. Saxon's messages are in English only, but you may have better luck with Xerces or MSXML.

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference