XQuery library functions
!=	ARG1 ARG2
*	ARG1 ARG2
+	ARG1 ARG2
-	ARG1 &OPTIONAL (ARG2 NIL ARG2-SUPPLIED)
/	ARG1 ARG2
<	E1 E2
<=	O1 O2
=	E1 E2
>	E1 E2
>=	O1 O2
and	ARG1 ARG2
avg	EXP
bagtolist	NODES
boolean	OBJECT
ceiling	NUMBER
comment	EXP
contains	S1 S2
count	NODES
data	OBJECT
deref	NODE
difference	S1 S2
distinct_nodes	NODES
distinct_value	NODES
document	URI
empty	DATUM
false
floor	NUMBER
id	OBJECT
index	EXP &AUX (INDEX 0)
intersection	S1 S2
lang	STRING
last
listtobag	NODES
local-name	&OPTIONAL (NODE *CONTEXT-NODE*)
localname	UNAME
max	EXP
min	EXP
mod	ARG1 ARG2
name	NODE
namespace	NAME
namespace-uri	&OPTIONAL (NODE *CONTEXT-NODE*)
nodes	NODE
normalize-space	&OPTIONAL (STRING *CONTEXT-NODE*)
not	OBJECT
number	&OPTIONAL (OBJECT *CONTEXT-NODE*)
or	ARG1 ARG2
parent	NODE
position
processing_instruction	NAME TARGET
ref	NODE
round	NUMBER
sequence	&REST ARGS
sort	SEQUENCE &REST FUNCTIONS-AND-KEYS &AUX FUN KEY
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
target	NODE
translate	STRING FROM TO
true
union	ARG1 ARG2
value	NODE