0=contains
1=doesn't contain
2=is
3=isn't
4=is empty

5=is before
6=is after
    
7=is higher than
8=is lower than

9=begins with
10=ends with

11=sounds like
12=LdapDwim

13=is greater than
14=is less than

15=NameCompletion
16=is in my address book
17=isn't in my address book