*CoreObject* is a framework for describing and organizing model objects, with automatic persistence and versioning by recording messages sent to objects. It offers a flexible versioning scheme where both individual objects and their entire object graph can be versioned separately. The built-in object model is a generalization of the property model used by the AddressBook framework. Foreign model objects can be also integrated by wrapping them with a special proxy. CoreObject uses the EtoileSerialize framework which, in many cases, allows objects and messages to be automatically serialized with no extra code being written. LICENSE: MIT Copyright (c) 2007-2008, Yen-Ju Chen, Quentin Mathe WWW: http://www.etoile-project.org/