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Head First Servlets and JSP, 2nd Edition by Bert Bates, Bryan Basham, Kathy Sierra

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What if the tag body uses an expression?

Imagine you have a tag with a body that uses an EL expression for an attribute. Now imagine that the attribute doesn’t exist at the time you invoke the tag! In other words, the tag body depends on the tag handler to set the attribute. The example doesn’t do anything very useful, but it’s here to show you how it works in preparation for a bigger example.

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