How to get the lang-attribute in a stylesheet?

Hi!

 

I have startet to change the javahelp.xsl, to fit the
version 2.0. Now I want to read the lang-attribute, I set in the Docbook file
by <book lang=“de“>.

 

I can get the title with $title, but I didn’t find some
information about the other available variables from my DocBook file.

 

Thanks and greetings,

Christian.