enum AttendanceStateThe states indicating the presence of known household members.
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                  The attendance state is unspecified. DeclarationSwift case attendanceStateUnspecified
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                  No household member statuses are known, for example, location signals are missing. DeclarationSwift case attendanceStateUnknown
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                  None of the household members are present in the area. DeclarationSwift case attendanceStateNoHouseholdMembers
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                  At least one household member is in the area, but not necessarily all of them. DeclarationSwift case attendanceStateSomeHouseholdMembers
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                  All household members are present in the area. DeclarationSwift case attendanceStateAllHouseholdMembers
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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.