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NSManagedObject conform to MKAnnotation
#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>
#import <MapKit/MapKit.h>

@interface Station : NSManagedObject <MKAnnotation>
@property (nonatomic, retain) NSString * station_name;
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
@end

#import "Station.h"


@implementation Station

@dynamic station_name;
@synthesize coordinate;
- (void)setCoordinate:(CLLocationCoordinate2D)newCoordinate
{
    coordinate = CLLocationCoordinate2DMake(newCoordinate.latitude, newCoordinate.longitude);
}
- (NSString*)title
{
    return self.station_name;
}
@end