XQuery

since unknown year (earliest usage recorded on this site was 2006)

Users

2006

2007

2008

2009

2010

2011

2012

liza

smalltobi

ndw

brutasse

liza - 3 years

smalltobi - 7 years

ndw - 5 years

brutasse - 3 years

2006–2008

2006–

Used it extensively during my diploma thesis. Still using it occasionally in combination with XSLT

2008–

2010–

Interesting functional approach to XML transformations (that's what I use it for, but it can do lots of other things too).