Objective C serialize a collection to JSON/XML - objective-c

Question

I have a classes looking like this:
#interface AISlideItem: NSObject <NSCoding>
{
NSString* PlaceHolderName;
NSInteger PlaceHolderID;
}
#property (nonatomic, strong) NSString* PlaceHolderName;
#property (nonatomic) NSInteger PlaceHolderID;
#end
#interface AITitleSlideItem : AISlideItem
{
NSString* Title;
}
#property (nonatomic, strong) NSString* Title;
#end
#interface AIParagraphSlideItem : AISlideItem
{
NSMutableArray* Paragraphs;
}
#property (nonatomic, strong) NSMutableArray* Paragraphs;
#end
#interface AITextSlideItem : AISlideItem
{
NSString* Text;
}
#property (nonatomic, strong) NSString* Text;
#end
#interface AIPictureSlideItem : AISlideItem
{
NSMutableData* Picture;
}
#property (nonatomic, strong) NSMutableData* Picture;
#end
#interface AISlideContent : NSObject
{
NSString* LayoutName;
NSMutableArray* Items;
}
#property (nonatomic,strong) NSString* LayoutName;
#property (nonatomic,strong) NSMutableArray* Items;
#end
#interface ContentParaghraph : NSObject
{
NSInteger Level;
NSString* Text;
}
#property (nonatomic) NSInteger Level;
#property (nonatomic, strong) NSString* Text;
#end
I create a complex collection from these classes like this:
NSMutableArray* l = [[NSMutableArray alloc]init ];
AITitleSlideItem* tis1 = [[AITitleSlideItem alloc]init];
[tis1 setPlaceHolderName:#"I don't think we're using this..."];
[tis1 setPlaceHolderID:1];
[tis1 setTitle:#"This is a title"];
AITextSlideItem* tes1 = [[AITextSlideItem alloc]init];
[tes1 setPlaceHolderName:#"I don't think we're using this..."];
[tes1 setPlaceHolderID:2];
[tes1 setText:#"This is the description"];
AISlideContent* slide1 = [[AISlideContent alloc]init];
[slide1 setLayoutName:#"Title content"];
[[slide1 Items]addObject:tis1];
[[slide1 Items]addObject:tes1];
[l addObject:slide1];
[l addObject:slide1];
What i want to to serialize the NSMutableArray l into any portable format like json or xml.
Could you please post some code doing so?
Sincerely
Zoli

Answer 1

After further investigation i found nothing more suitable for my needs.
I decided to learn a bit more about JSON and create a function that creates the JSON structure manually. Even if it took 2-3 hours, it did worth all the effort.