Does Symfony 1.1 / 1.2 convey meaning?
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The main advantage lies in the structure of the new forms. In this way, the feature layer can be easily linked to the data entry layer and be much more powerful and actionable. You have sets of widgets and validators, and each form can be extended like the current model layer, you can create your own widgets and reuse them in other projects via plugins, etc. 1.2 is much more about REST architecture. If you want to use a RESTful application, you should consider it as it implements a new routing framework, all object oriented.
The reason I am using 1.2 is also for the full Doctrine integration. Doctrine is a real gem to play with and is definitely changing the way things are done in symfony. Couldn't come back at any cost.
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