Data of the Enum, or Enumerated, type is data with a fixed, limited number of options. Usually (as far as to be seen in Titan) the options need to be given as String.

Examples:

• a cue's fade mode can only be of “Mode0”, “Mode1”, “Mode2”, or “Mode3”
• the overall playback paging can only be of “AlwaysHold”, “NeverHold”, or “Normal”

Some (few) enumerations are listed in the online documentation - just scroll to the end in the left-hand contents frame, e.g.

• AcwRecordMask
• GroupLayoutMode
• AcwTimecodeSource