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@interface ExampleJModel : RFJModel
JProperty(NSString *value_NSString, map_value_NSString);
@property (nonatomic, assign) int64_t tag;
@end

@implementation ExampleJModel
@end

{
    "map_value_NSString":"hello world",
}

NSDictionary *json = ...;
ExampleJModel *model = [[ExampleJModel alloc] initWithJsonDict:json];
NSLog(@"%@", model.value_NSString);