last()

position()

count()

id()

local-name()

namespace-uri()

name()

string()

concat()

starts-with()

contains()

substring-before()

substring-after()

substring()

string-length()

normalize-space()

translate()

boolean()

not()

true()

false()

lang

This function is not supported.

number()

sum()

floor()

ceiling()

round()