• Logical
• Comparison
• Numerical
• Nodeset operators

Precedence of operators is (lowest to highest):

Operators	Examples
or	@xyz or @abc
and	@xyz and @abc
= , !=	@xyz = '325' ; @xyz != '325'
<= , < , >= , >	@year < 1990 ; <= 1990 ; 1990 > @year ; 1990 >= 1990
+ , -	@year - @birthyear ; @birthyear + @age
* , div , mod	@size * 2 ; @size div 2 ; @size mod 3
unary -	-@size --@size ---@size
|	title | book
location path	thought/title
filter expression	title [position() > 3]