State (property type)
A "State List" property type has two or more options that you can choose from, each of which is a single word.
If the state list only has two options, then it is displayed as two side-by-side radio buttons and you simply select the one you want. If you select the "Object can be opened and closed" property on the properties page of an object, then you will see the mandatory "Open status" property which has two radio buttons marked "Open" and "Closed".
The "Gender" property of characters is an example of a state-list with more than two options. In this case a drop-down list is displayed from which you can select the wanted option.
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