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1#ifndef SIMPLE_H2#define SIMPLE_H3 4__attribute__((__objc_root__))5@interface I6@property(class, nonatomic, readonly) id nonnullProperty;7@property(class, nonatomic, readonly) id nonnullNewProperty;8 9@property(class, nonatomic, readonly) id optionalProperty;10@property(class, nonatomic, readonly) id optionalNewProperty;11 12@property(nonatomic, readonly) id unspecifiedProperty;13@property(nonatomic, readonly) id unspecifiedNewProperty;14 15@property(nonatomic, readonly) id scalarProperty;16@property(nonatomic, readonly) id scalarNewProperty;17@end18 19#endif20