Hi OJB cummunity, here a link to a tool wich generates a model based on a OJB repository: http://www.claude-glauser.ch/j2ee/ojb/repository2uml2/index.html <http://www.claude-glauser.ch/j2ee/ojb/repository2uml2/index.html> here a link to an article about object-serialization (ojb): http://www.claude-glauser.ch/mambo/content/view/49/50/ <http://www.claude-glauser.ch/mambo/content/view/49/50/> Please send inaccuracies to [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> Best regards, Claude