Chapter 22. Advanced Custom Tag Library Features

In the previous chapter, you learned how to develop basic tag handlers, such as conditional and iteration actions, with and without access to the element body. But there's a lot more that you can do. In this chapter we look at some more advanced features: how actions can cooperate, how to work with undeclared action element attributes, how to verify that actions are used correctly, how to bundle listener classes with a tag library, and how to convert text attribute values into types more appropriate for the tag handler. Most of these features work the same for both simple and classic tag handlers.