Saxon extensions to the W3C XSLT/XQuery specifications
saxon:distinct() extension function now works on any sequence.
saxon:range() extension function
(it can now be done using the syntax "a to b")
saxon:tokenize() to return a sequence of strings instead of a node-set
saxon:node-set() extension function, which is now obsolete.
saxon:if() extension function, which is superseded by XPath 2.0
saxon:closure()function is temporarily withdrawn, because it relies on non-standard use of the