Directive Tags

Directive element have a syntax of the form<%@ directive... %>.
Directive element provide information to the translation phase.
Directives:

Directives are messages to the JSP container.
Directives have this syntax:

<%@ directive{attr="value"} * %>

Directives are used to control aspects of tag file translation to a tag handler, and to specify aspects of the tag, attributes of the tag, and variables
There may be optional white space after the<%@ and before %>.
Directive do not produce any output into the current out stream.

There are three type of directives:

● Page Directive(%%@ page attributes %>)
● Include Directive(<%@ include attributes %>)
● Tag library Directive(%@ taglib attributes %>)

DirectiveDescription
taglibIdentical to taglib directive (see Declaring Tag Libraries) for JSP pages.
includeIdentical to include directive (see Reusing Content in JSP Pages) for JSP pages. Note that if the included file contains syntax unsuitable for tag files, a translation error will occur.
tagSimilar to the page directive in a JSP page, but applies to tag files instead of JSP pages. As with the page directive, a translation unit can contain more than one instance of the tag directive. All the attributes apply to the complete translation unit. However, there can be only one occurrence of any attribute or value defined by this directive in a given translation unit. With the exception of the import attribute, multiple attribute or value (re)definitions result in a translation error.
Also used for declaring custom tag properties such as display name. See Declaring Tags.
attributeDeclares an attribute of the custom tag defined in the tag file. See Declaring Tag Attributes in Tag Files.
variableDeclares an EL variable exposed by the tag to the calling page. See Declaring Tag Variables in Tag Files.

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