lib/expressir/model/literals/logical.rb in expressir-0.2.2 vs lib/expressir/model/literals/logical.rb in expressir-0.2.3

@@ -1,8 +1,12 @@
 module Expressir
   module Model
     module Literals
       class Logical
+        TRUE = :TRUE
+        FALSE = :FALSE
+        UNKNOWN = :UNKNOWN
+
         attr_accessor :value
 
         def initialize(options = {})
           @value = options[:value]
         end
\ No newline at end of file