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Binding of user input to command objects

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I understand that spring 2.x provides a feature of binding all user input (entered through Html forms) to the command object. But, I have two questions related to binding.

1) I see that both spring:bind tags and spring:form tags can be used for data binding. Then what is the difference between them? Are spring:form, form:input, form:hidden tags a replacement of spring:bind tags?

2) In my sample spring applications I have been binding my user inputs to command objects without the use of spring:form tags. If I am able to do that when why should I use spring:form tag library.

Please advise.

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