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-<?xml version="1.0" encoding="ISO-8859-1" ?>
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
-<html xmlns="">
-<meta name="copyright" content="Copyright (c) IBM Corporation and others 2006. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page." />
-<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
-<link rel="STYLESHEET" href="../book.css" charset="ISO-8859-1" type="text/css"/>
-<title>Common JET Tags</title>
-<h2>Common JET Tags</h2>
-<p>JET includes four <b>tag libraries</b>, which are collections of related tags. These are:
- <li> Control tags - used for accessing the input model, and controlling template execution.</li>
- <li> Format tags - used to alter (format) text in templates according to certain rules. </li>
- <li> Java tags - special tags useful to generating Java code.</li>
- <li> Workspace tags - used for creating workspace resources, such as files, folders and projects.</li>
-<p>Although there are many tags available, only a few are needed to get started.
-These tags are either control or workspace tags</p>
-<h3>Most common control tags</h3>
-<p>Control tags usually access the input model, and either produce a value, or cause an action based on the information
-extracted from the input model. The control tags access the input model via <b>XPath expressions</b>.
-(See <a href="essentialXPath.xhtml">Essential XPath</a>).
-Three control tags are used frequently:
- <li> <code><a href="../references/taglibs/controlTags/getTag.html">c:get</a></code> - Write a value from the input model into the expanded template.</li>
- <li> <code><a href="../references/taglibs/controlTags/iterateTag.html">c:iterate</a></code> - Traverse elements in the input model and evaluate the contained template text once for each element. </li>
- <li> <code><a href="../references/taglibs/controlTags/setTag.html">c:set</a></code> - create or set an attribute on a model element. This is frequently used to store the result of a calculation. </li>
-<h3>Most common workspace tags</h3>
-<p>Three workspace tags are used frequently:
- <li> <code><a href="../references/taglibs/workspaceTags/fileTag.html">ws:file</a></code> - Write a workspace file, settings its contents to the result of expanding a template.</li>
- <li> <code><a href="../references/taglibs/workspaceTags/folderTag.html">ws:folder</a></code> - Create a workspace folder. </li>
- <li> <code><a href="../references/taglibs/workspaceTags/projectTag.html">ws:project</a></code> - Create a workspace project. </li>
-<h3>Accessing model elements within tag attributes</h3>
-<p>Frequently, templates must use a model value in a tag's attribute. For example, the name of a generated file
-might depend on a value from the input model. To do this, the <code>main.jet</code> template would require a <code>ws:file</code> that looks like:
-&nbsp;&nbsp;&nbsp;&nbsp;&lt;ws:file template="..." path="... value from the model..."/&gt;
-Because JET does not permit one XML tag to be embedded in an attribute value of another, JET provides
-<b>Dynamic XPath Expressions</b>, which can be used only in tag attribute values. The format of a dynamic
-XPath expression is:
-&nbsp;&nbsp;&nbsp;&nbsp;{<i>XPath expression</i>}
-So, the <code>ws:file</code> tag above would be written as:
-&nbsp;&nbsp;&nbsp;&nbsp;&lt;ws:file template="..." path="{<i>XPath expression</i>}"/&gt;

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