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what is "unassigned literal" when defining an enumeration attribute in RTC

jeff thomas (542528) | asked Oct 07 '14, 6:30 p.m.
 When you define an enumeration type in RTC, you need to define a default value and an unassigned literal.  I understand what the default value is for.  I'm not sure about the "unassigned literal".  Can anybody explain that to me?

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Lily Wang (4.9k714) | answered Oct 07 '14, 7:29 p.m.
Hi Jeff, 

If you want to make an enumeration attribute as a required field, you can define an Unassigned literal. When the enumeration attribute has this Unassigned literal selected, RTC considers the attribute is unset. For a use case, you can see the answer in the post

Hope that's helpful.
jeff thomas selected this answer as the correct answer

jeff thomas commented Oct 07 '14, 7:54 p.m.

thank you Lily. 

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