XPath library functions
!=	ARG1 ARG2
*	ARG1 ARG2
+	ARG1 ARG2
-	ARG1 &OPTIONAL (ARG2 NIL ARG2-SUPPLIED)
/	ARG1 ARG2
<	ARG1 ARG2
<=	ARG1 ARG2
=	ARG1 ARG2
>	ARG1 ARG2
>=	ARG1 ARG2
and	ARG1 ARG2
boolean	OBJECT
ceiling	NUMBER
contains	S1 S2
count	NODES
document	URI
false
floor	NUMBER
id	OBJECT
lang	STRING
last
local-name	&OPTIONAL (NODE *CONTEXT-NODE*)
mod	ARG1 ARG2
name	NODE
namespace-uri	&OPTIONAL (NODE *CONTEXT-NODE*)
normalize-space	&OPTIONAL (STRING *CONTEXT-NODE*)
not	OBJECT
number	&OPTIONAL (OBJECT *CONTEXT-NODE*)
or	ARG1 ARG2
position
round	NUMBER
starts-with	STRING1 STRING2
string	&OPTIONAL (OBJECT *CONTEXT-NODE*)
string-length	&OPTIONAL (STRING *CONTEXT-NODE*)
substring	STRING START &OPTIONAL END
substring-after	STRING1 STRING2
substring-before	STRING1 STRING2
sum	NODES
translate	STRING FROM TO
true
union	ARG1 ARG2