Advanced Customization > Info*Engine User’s Guide > Info*Engine Custom Tag Reference > Info*Engine Tags
  
Info*Engine Tags
Info*Engine tags provide access to a set of custom actions that encapsulate recurring functionality so that the same functionality can be reused in multiple Info*Engine JSP pages or standalone tasks.
Using Info*Engine tags reduces the necessity to embed large amounts of Java code in JSP pages and in standalone tasks, and allows you to quickly create the pages and tasks that are required for your application.
The tags for Info*Engine JSP pages are provided in the following tag libraries:
• Core
• Directory
• Supplied
* 
The tags in the directory tag library are not supported in standalone tasks.
To use the Info*Engine tags, you must include the taglib directive, which identifies the tag library and provides a prefix for uniquely identifying the tags on the page. For example, to use the directory Info*Engine tags and identify them by the iedir prefix, include the following directive:
<%@ taglib uri="http://www.ptc.com/infoengine/taglib/directory"
prefix="iedir" %>
The syntax for each tag described here assumes that the taglib prefix attribute is set to one of the following. However, if you specify a different prefix, use the prefix you specified in place of the supplied tag syntax examples shown here:
Tag Library
taglib Prefix
Core
ie
Directory
iedir
Supplied – JSTL
c
Supplied – XSL
xsl
Supplied – Logging
log
The following Info*Engine tags are available:
Tag
Tag Library and Description
Supplied Tag Library (JSTL). Allows for conditional evaluation with an alternative for evaluation failure (if/else).
Directory Tag Library. Creates new entries in the specified LDAP directory service.
Directory Tag Library. Deletes an LDAP entry from the LDAP directory service.
Core Tag Library. Extracts and displays a string directly from a resource bundle or from a group created with the Get-Resource webject.
Core Tag Library. Allows you to supply code for failure processing within a unit.
Core Tag Library. Allows you to iterate through an existing Info*Engine group, one element at a time.
Supplied Tag Library (JSTL). Supports iteration over an iterable, group, or array of objects. Provides JSTL support for Info*Engine tasks.
Core Tag Library. Establishes a variable reference to the Info*Engine object (com.infoengine.jsp.InfoEngine) that is being used by the Info*Engine custom tags on a JSP page.
Core Tag Library. Retrieves the string value of the specified attribute from the first element in the input group.
Supplied Tag Library (JSTL). Allows for conditional evaluation of its body. Provides JSTL support for Info*Engine tasks.
Supplied Tag Library (Logging). One tag for each corresponding log4j log level. Each issues a log message to the corresponding log method.
Core Tag Library. Supplies the initialization for a unit.
Directory Tag Library. Creates an Info*Engine group containing elements that are the relative distinguished names of the LDAP directory entries located directly under the specified base directory level.
Supplied Tag Library. (JSTL). If the when tag evaluates to false, then the content of the otherwise tag is invoked and executed (representing the “else” of if/else logic). Provides JSTL support for Info*Engine tasks.
Core Tag Library. Allows you to define a set of webjects or tasks that are executed concurrently.
Core Tag Library. Defines a parameter for use within webject tags, task tags, and directory service tags.
Supplied Tag Library (XSL). Specifies a value for an XSL parameter to be supplied for the transformation. This tag is embedded within a transform tag and is optional. Provides XSL transformation tag support.
Directory Tag Library. Creates an Info*Engine group containing elements that are the LDAP directory entries matching the search criteria specified.
Core Tag Library. Resets the Info*Engine object (com.infoengine.jsp.InfoEngine) that is being used by the Info*Engine custom tags on a JSP page or in a session.
Supplied Tag Library (JSTL). Terminates task invocation. Provides JSTL support for Info*Engine tasks.
Supplied Tag Library (JSTL). Sets a variable in either the tasklet context or request context. Provides JSTL support for Info*Engine tasks.
Supplied Tag Library (Logging). Sets the log4j logger to be used.
Core Tag Library. Allows you to supply code for success processing within a unit.
Core Tag Library. Identifies an XML task that you want to execute.
Supplied Tag Library (XSL). Performs XSL transformation on an input group and streams the result to the task’s output stream. Supports embedded param tags.
Core Tag Library. Allows you to group a sequence of webjects, tasks, or Java code so that the group is executed as a unit.
Directory Tag Library. Updates existing entries in an LDAP directory service.
Core Tag Library. Identifies the webject you want to execute.
Supplied Tag Library (JSTL). Similar to the if tag, but within the choose parent tag (represents the “if” of if/else logic). Provides JSTL support for Info*Engine tasks.
The following section describes some rules you need to be familiar with, and is followed by topics describing each tag in detail.