Operators
=========

In general, operators describes how filter conditions are linked together. 
The following operators can be used. Boolean operators like "AND" or "OR" 
can be used to create :doc:`complex filter conditions <../references/complexfilterconditions>`.


**AND:**
  All filters placed below must be true. Only then AND returns TRUE.


**OR:**
  If one or both of the filters placed below is true, OR returns TRUE.


**NOT:**
  Only one Filter can be placed below NOT operator, and if the filter evaluation 
  is true, NOT returns FALSE.


**XOR:**
  If one of the two filters are possible in the XOR Operator.


**TRUE:**
  Useful for debugging, just returns TRUE.


**FALSE:**
  Useful for debugging as well, returns FALSE.