Search Operator Constants while defining data dictionary.
EQUALS = 1
NOT_EQUALS = 2
GREATER_THAN = 3
LESS_THAN = 4
GREATER_EQUALS = 5
LESS_EQUALS = 6
BEGINS_WITH = 7
CONTAINS = 8
DOES_NOT_CONTAIN = 9
ENDS_WITH = 10
IN = 11
NOT_IN = 12
BETWEEN = 13
IS_NULL = 14
IS_NOT_NULL = 15
NOT = 16