How can I check which XSLT processor is being used in Solr?

Question

How can I verify which XSLT processor is being used in Solr? I want to change the XSLT version from 1.0 to 2.0.

I am using Solr 4.0.

Answer 1

Use:

to identify the processor and:

to identify the version of XSLT it supports.