Struts 2 - The usage of %{ } notation

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What is the exact use of %{} notation in Struts 2? Can someone explain with a simple example where the code works when %{} is used and does not works when its not used?

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Roman C On BEST ANSWER

Used in OGNL to force evaluate the content in brackets as OGNL expression. For example

<s:iterator value = "myAnswers" status="stat">
<s:textfield name = "myAnswers[%{#stat.index}].name"/> 

evaluation of the stat.index should be forced.