Anatomy of an Ext plugin

The following table represents a Anatomy of Ext.This is a simple structure and purpose of the each directory

Directory	Purpose
xxx-ext/docroot/WEB-INF	All the folders that make up the plugin are in the WEB-INF folder
ext-impl	It contains all source and configuration files except those related to the web application. When an Ext plugin is created, several important files are placed in subdirectories. The most significant are as follows: /src/portal-ext.properties – Used to override the values of the properties in portal.properties /src/system-ext.properties – Used to override the values of the properties in system.properties /src/content/Language-ext.properties – Used to add your own internationalized text messages that ship with liferay portal
ext-lib	Contains any extra dependency libraries
ext-service	Contains the classes that are generated by Liferay’s service builder
ext-util-bridges	Corresponds to the util-bridges folder in the Liferay source
ext-util-java	Corresponds to the util-java folder in the Liferay source
ext-util-taglib	Corresponds to the util-taglib folder in the Liferay source
ext-web	Contains your JSPs, HTML, images JavaScript, and all other web application related files in the subdirectory To add entries to the web application configuration file,edit/docroot/WEB-INF/web.xml To add a portlet,edit /docroot/WEB-INF/portlet-ext.xml, /docroot/WEB-INF/liferay-portlet-ext.xml and docroot/WEB-INF/liferay-display.xml Customizing some of Liferay’s internal StrutsPortlets, the following files will also be of interest to you: docroot/WEB-INF/struts-config.xml and docroot/WEB-INF/tiles-defs.xml