Encapsulating Reusable Content Using Tag Files
A tag file is a source file that contains a fragment of JSP code that is reusable as a custom tag. Tag files allow you to create custom tags using JSP syntax. Just as a JSP page gets translated into a servlet class and then compiled, a tag file gets translated into a tag handler and then compiled.
The recommended file extension for a tag file is .tag. As is the case with JSP files, the tag can be composed of a top file that includes other files that contain either a complete tag or a fragment of a tag file. Just as the recommended extension for a fragment of a JSP file is .jspf, the recommended extension for a fragment of a tag file is .tagf.
The following version of the Hello, World application ...
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