gistfile1.txt

// BMOEDNSymbol.h

#import <Foundation/Foundation.h>

@interface BMOEDNSymbol : NSObject <NSCopying>

@property (strong, nonatomic, readonly) NSString *ns;
@property (strong, nonatomic, readonly) NSString *name;

-(instancetype)initWithNamespace:(NSString *)ns
                            name:(NSString *)name;

+(BMOEDNSymbol *)symbolWithNamespace:(NSString *)ns
                                name:(NSString *)name;


-(BOOL)isEqualToSymbol:(BMOEDNSymbol *)object;

@end


//// BMOEDNSymbol.m


@implementation BMOEDNSymbol

-(instancetype)initWithNamespace:(NSString *)ns
                            name:(NSString *)name {
    if (name == nil) @throw [NSException exceptionWithName:NSInvalidArgumentException reason:@"Symbol name must not be nil." userInfo:nil];
    
    if (self = [super init]) {
        _ns = ns;
        _name = name;
    }
    return self;
}

// swift

BMOEDNKeyword(namespace:"foo", name:"bar")

-(NSString *)description {
    if (self.ns == nil) return [self.name description];
    else return [NSString stringWithFormat:@"%@/%@",self.ns,self.name];
}