http://developer.apple.com/mac/library/DOCUMENTATION/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtPropertyIntrospection.html http://developer.apple.com/mac/library/DOCUMENTATION/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtTypeEncodings.html http://www.webweavertech.com/ovidiu/Objective-C/objc-features_3.html http://www.mail-archive.com/es-discuss@mozilla.org/msg00999.html http://www.mail-archive.com/es-discuss@mozilla.org/msg01025.html