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The expression language (OGNL) lets us call methods and evaluate properties. The method getText is provided by ActionSupport, which is the base class for most Actions. Since the Action is on the stack, we can call any of its methods from an expression, including getText.

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1. All String attribute types are parsed for the "%{ ... }" notation.
2. All non-String attribute types are not parsed, but evaluated directly as an expression
3. The exception to rule #2 is that if the non-String attribute uses the escape notion "{%{}", the notation is ignored as redundant, and the content evaluated.

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