creating a tld

public class myTag extends TagSupport{
}

mytag.tld

< taglib xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
    version="2.0" -->
    
  <-- description -->my excelent tag<--/ description -->
  <-- display-name -->company taglib<--/ display-name -->
  <-- tlib-version -->1.1<--/ tlib-version -->
  <-- short-name -->mytag<--/ short-name -->
  <-- uri -->http://java.sun.com/jsp/jstl/core<--/ uri -->
  <-- tag -->
    <-- description -->
       my great tag
    <--/ description -->
    <-- name -->calendar<--/ name  -->
    <-- tag-class -->com.mypackage.Calendar<--/ tag-class -->
    <-- body-content -->JSP<--/ body-content -->
    <-- attribute -->
        <-- description --> 
            the calendar obj
        <--/ description -->
        <-- name -->objname<--/ name -->
        <-- required -->true<--/ required -->
        <-- rtexprvalue -->true<--/ rtexprvalue -->
    <--/ attribute -->
   <--/ tag -->
<--/ taglib -->

accessing in .jsp

<%@ taglib uri="/WEB-INF/mytag.tld" prefix="mytag" %>
< mytag:calendar objname="myCalendar" />