a<b or a lt b (less than; the alternate
notation lt can be used to avoid conflicts with the special
XML character <, see Section 8.5.5 "Expression Terms and XML")
a<=b or a le b (less or equal)
a>b or a gt b (greater than)
a>=b or a ge b (greater or equal)
These operators apply to numbers (numerical ordering)
and string values (lexicographical ordering).
In addition, you can use the following operators on the indicated types:
a startswith b (true if string a starts with string b)
a endswith b (true if string a ends with string b)
a onlist b (true if string a is on word list b)
a->b or a in b (true if element or value
a is contained in set b)