An enum is a list of literals. Before you can use an enum, you must declare it in Application Explorer.
Hundreds of enumerable types are built into the standard application. For example, the NoYes enum has two associated literals: No has the value 0, and Yes has the value 1.
To reference an enum value, enter the name of the enum, two colons, and then the name of the literal. For example, to use the literal No in the NoYes enum, enter NoYes::No.