It is considered a best practice to create Keyword Type Groups with the Allow Null Values setting enabled. This setting increases the accuracy of the data being stored in OnBase. When this setting is selected, OnBase considers unindexed values null. Null values are not factored into queries and retrieval. When this setting is not selected, OnBase supplies empty values for any Keyword Values left unindexed. Empty values are factored into queries and retrieval. A search that uses comparative keyword operators will compare empty values to a provided Keyword Value.