BookOpeningPolicy  
    The policy to pass back to the callback in the BookOpening.onWillOpenBook function.
Entries
Properties
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                  The reason why opening the book was denied. null if the policy is ALLOW.
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                  Returns a representation of an immutable list of all enum entries, in the order they're declared.
Functions
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                  Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
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                  Returns an array containing the constants of this enum type, in the order they're declared.