XML Query Languages

I have my final project in my university,and i have to find and compare all the
xml query languages.I have focused until now at Lorel, XML-QL, XQL, XML-GL ,
XQuery and XSLT. 
Are there any other languages to search? 
Does the most of these language (like xml-ql,xql and xml-gl) work nowadays? 
XDuce is also a usable language? 
Thank you,
kostas

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