Cocoa Foundation

Linked List Discussions

 * http://www.jonathansaggau.com/blog/2007/02/core_data_double_linked_list_h.html

Formatting

 * http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/DataFormatting/DataFormatting.html

Reference
NSDictionary * foo = SomeFunctionReturningAnNSDictionary; NSEnumerator * e = [foo keyEnumerator]; id obj; while (obj = [e nextObject]) { NSLog(@"Key: %@", obj); }
 * Understanding Cocoa Foundation