I'm a fan of declarative (eg. logic) programming but how is XSLT declarative when Java and XML isn't? XSLT has been proven Turing-complete a long time ago (eg. [1]), and if anything, is functional, being derived from DSSSL/Scheme up to the XML syntax.

[1]: http://conferences.idealliance.org/extreme/html/2004/Kepser0...).