>   C:\Program
> Files\Altova\xmlspy\XMLSpyInterface.jar;C:\Program
> Files\Java\jdk1.5.0_02\bin;C:\saxon84
>
>   Is there a syntax error ?

You need to put the actual jar on the classpath as well (as the jar is a
folder) eg:

C:\saxon84\saxon8.jar

cheers
andrew