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From commons-...@jakarta.apache.org
Subject [Jakarta Commons Wiki] New: Jelly
Date Thu, 11 Nov 2004 00:48:43 GMT
   Date: 2004-11-10T16:48:43
   Editor: DionGillard <dion@apache.org>
   Wiki: Jakarta Commons Wiki
   Page: Jelly
   URL: http://wiki.apache.org/jakarta-commons/Jelly

   no comment

New Page:

Jelly is a tool for turning XML into executable code. So Jelly is a Java and XML based scripting
and processing engine. Jelly can be used as a more flexible and powerful front end to Ant
 such as in the Maven  project, as a testing framework such as JellyUnit  , in an intergration
or workflow system such as werkflow  or as a page templating system inside engines like Cocoon
 .

Jelly borrows many good ideas from both JSP custom tags, Velocity, Cocoon, Ant. Jelly can
be used from the command line, inside Ant and Maven or inside a Servlet, Web Service, JMS
MessageListener or embedded directly into your software.

Jelly has native support for a Velocity-like expression language called Jexl which is a superset
of the JSP, JSTL and JSF expression languages as well as support for other pluggable expression
languages like XPath via Jaxen , JavaScript, beanshell and Jython.

Jelly is completely extendable via custom tags in a similar way to JSP custom tags or Ant
tasks. Though Jelly is really simple and has no dependencies either Servlets or JSP. So you
could think of Jelly as similar to an XML-ized Velocity where the directives are XML tags.
Or you could think of Jelly as a more flexible engine for processing Ant tasks with better
expression, logic and looping support.

Jelly is also based on an XML pipeline architecture, like Cocoon, so that it is ideal for
processing XML, scripting web services, generating dynamic web content or being part of a
content generation system such as Cocoon. 

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