symfony embeded / merge forms

A list of reference:

http://www.blogs.uni-osnabrueck.de/rotapken/2009/03/13/symfony-merge-embedded-form/

http://symfony.com/blog/call-the-expert-customizing-sfdoctrineguardplugin

http://sandbox-ws.com/2009/01/how-to-embed-forms-in-symfony-12-admin-generator-part-2/

http://www.devexp.eu/2009/03/19/symfony-forms-framework-merge-2-forms/

http://tech.cibul.net/embedded-forms-with-symfony-1-4-and-jquery/

there are a few things need to be mentioned:

i18n of sf 1.4 cannot take care of image upload properly, if each language of your site has it's own image.

but I've solved this.

I'll try to draw a data flow and give a few case studies for better understanding of the form framework.