+ const EQ = '=';
+ const NEQ = '<>';
+ const LT = '<';
+ const LTE = '<=';
+ const GT = '>';
+ const GTE = '>=';
+ const IS = '='; // no difference with EQ
+ const IN = 'IN';
+ const NIN = 'NIN';
+ const CONTAINS = 'CONTAINS';
+ const MEMBER_OF = 'MEMBER_OF';
+ const STARTS_WITH = 'STARTS_WITH';
+ const ENDS_WITH = 'ENDS_WITH';