Tag Library Overview
Tag libraries exist for one reason: to enable the separation of business and presentation logic within a JSP page. All business logic should be placed in JavaBeans, and all presentation logic should be placed in tag libraries.
By using a tag library, the programmer can offer a simple XML-based interface through which anybody may access the tag library.
One way to maintain the separation of the business logic and presentation logic is by using tag libraries to access JavaBeans. Once a tag library is packaged in a JSP project, the XML tags are easy enough to use that non-programmers can use them to access more complicated programming logic.
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