title: What is <spring:bind> for? When to use it, and when not to use it?
body: <p>I am having problems with submitting form data in spring. <code>&lt;spring:bind&gt;</code> seems to be a part of the solution. See my full problem  <a href="https://stackoverflow.com/questions/6845450/spring-dynamic-expandable-list-form">here</a>.</p>
  
  <p>The documentation of BindTag <a href="http://static.springsource.org/spring/docs/3.0.5.RELEASE/api/org/springframework/web/servlet/tags/BindTag.html" rel="noreferrer">found here</a> is not clear to me. Why is <code>&lt;spring:bind&gt;</code> needed in some cases to submit data, while it is not needed in most cases?</p>
  
  <p>What are the typical cases where the <code>&lt;spring:bind&gt;</code> must be used in order for a form to function properly?</p>