For a custom tag library or a library of Tag Files, create the 'taglib' directive for a JSP page.

The set of significant（有意义的, 重大的, 重要的） tags a JSP container interprets （解释, 说明）can be extended through a tag library.

The taglib directive in a JSP page declares that the page uses a tag library, uniquely（独特地,唯一地,珍奇地） identifies the tag library using a URI and associates（使发生联系, 使联合） a tag prefix that will distinguish usage of the actions in the library.

If a JSP container implementation cannot locate a tag library description, a fatal translation error shall result.

It is a fatal translation error for the taglib directive to appear after actions or functions using the prefix.

In the following example, a tag library is introduced and made available to this page using the super prefix; no other tag libraries should be introduced in this page using this prefix. In this particular case, we assume the tag library includes a doMagic element type, which is used within the page.

JSTL增加的部分：

The center of JSTL is the core taglib. This can be split into five areas:

To use the core library, use the following directive:

<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
The prefix attribute specifies（指定，规定，确定） the prefix used in the tag name for a particular library. For example, the core library includes a tag named out. When combined with a prefix of c, the full tag would be <c:out>. You are free to use any prefix you like, but you must use different prefixes for each of the four standard tag libraries.

You must also put the corresponding（相应的） .tld file for each tag library in your /WEB-INF directory and use the taglib element in your web.xml file to include the tag library:

<taglib>
    <taglib-uri>http://java.sun.com/jstl/core</taglib-uri>
    <taglib-location>/WEB-INF/tld/core.tld</taglib-location>
</taglib>

General purpose tags.