enum LevelValueEnumLevel values.
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                  Unknown. DeclarationSwift case unknown
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                  Low. DeclarationSwift case low
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                  Medium. DeclarationSwift case medium
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                  High. DeclarationSwift case high
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                  Critical. DeclarationSwift case critical
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                  Creates a new instance with the specified raw value. If there is no value of the type that corresponds with the specified raw value, this initializer returns nil. For example:enum PaperSize: String { case A4, A5, Letter, Legal } print(PaperSize(rawValue: "Legal")) // Prints "Optional(PaperSize.Legal)" print(PaperSize(rawValue: "Tabloid")) // Prints "nil"DeclarationSwift init?(rawValue: UInt64)ParametersrawValueThe raw value to use for the new instance.