Oxygen XML Developer performs the validation of XSLT documents with the help of an XSLT processor that you can configure in the preferences pages according to the XSLT version. For XSLT 1.0, the options are: Xalan, Saxon 6.5.5, Saxon 9.6.0.7 and a JAXP transformer specified by the main Java class. For XSLT 2.0, the options are: Saxon 9.6.0.7 and a JAXP transformer specified by the main Java class. For XSLT 3.0, the options are Saxon 9.6.0.7 and a JAXP transformer specified by the main Java class.
To access the XSLT
preferences quickly, use the 
Validation options action from the menu.
